repos/blastem: ymz263b.c annotate

annotate ymz263b.c @ 2461:a25e8f304343

Fix handling of zero timer value

author	Michael Pavone <pavone@retrodev.com>
date	Fri, 23 Feb 2024 20:22:00 -0800
parents	a4f8fa24764b
children	b5640ac9aea9

rev	line source
2460 a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	1 #include <string.h>
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	2 #include "ymz263b.h"
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	3 #include "backend.h"
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	4
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	5 enum {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	6 YMZ_SELT,
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	7 YMZ_LSI_TEST,
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	8 YMZ_TIMER0_LOW,
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	9 YMZ_TIMER0_HIGH,
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	10 YMZ_TIMER_BASE,
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	11 YMZ_TIMER1,
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	12 YMZ_TIMER2_LOW,
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	13 YMZ_TIMER2_HIGH,
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	14 YMZ_TIMER_CTRL,
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	15 YMZ_PCM_PLAY_CTRL,
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	16 YMZ_PCM_VOL,
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	17 YMZ_PCM_DATA,
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	18 YMZ_PCM_CTRL,
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	19 YMZ_MIDI_CTRL,
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	20 YMZ_MIDI_DATA
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	21 };
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	22
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	23 //YMZ_SELT
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	24 #define BIT_SELT 0x01
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	25
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	26 //YMZ_TIMER_CTRL
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	27 #define BIT_ST0 0x01
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	28 #define BIT_ST1 0x02
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	29 #define BIT_ST2 0x04
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	30 #define BIT_STBC 0x08
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	31 #define BIT_T0_MSK 0x10
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	32 #define BIT_T1_MSK 0x20
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	33 #define BIT_T2_MSK 0x40
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	34
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	35 #define TIMER_RUN_MASK (BIT_ST0\|BIT_ST1\|BIT_ST2)
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	36 #define TIMER_INT_MASK (BIT_T0_MSK\|BIT_T1_MSK\|BIT_T2_MSK)
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	37
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	38 //YMZ_PCM_PLAY_CTRL
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	39 #define BIT_ADP_RST 0x80
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	40
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	41 //YMZ_MIDI_CTRL
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	42 #define BIT_MSK_RRQ 0x01
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	43 #define BIT_MRC_RST 0x02
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	44 #define BIT_MSK_TRQ 0x04
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	45 #define BIT_MTR_RST 0x08
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	46 #define BIT_MSK_MOV 0x10
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	47 #define BIT_MSK_POV 0x20
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	48
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	49 #define STATUS_FIF1 0x01
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	50 #define STATUS_FIF2 0x02
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	51 #define STATUS_RRQ 0x04
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	52 #define STATUS_TRQ 0x08
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	53 #define STATUS_T0 0x10
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	54 #define STATUS_T1 0x20
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	55 #define STATUS_T2 0x40
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	56 #define STATUS_OV 0x80
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	57
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	58 #define MIDI_BYTE_DIVIDER 170
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	59
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	60 #define FIFO_EMPTY 255
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	61 void ymz263b_init(ymz263b *ymz, uint32_t clock_divider)
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	62 {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	63 memset(ymz, 0, sizeof(*ymz));
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	64 ymz->clock_inc = clock_divider * 32;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	65 ymz->base_regs[YMZ_SELT] = 1;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	66 ymz->pcm[0].regs[0] = BIT_ADP_RST;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	67 ymz->pcm[1].regs[0] = BIT_ADP_RST;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	68 ymz->midi_regs[0] = BIT_MTR_RST \| BIT_MRC_RST;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	69 ymz->midi_trs.read = ymz->midi_rcv.read = FIFO_EMPTY;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	70 ymz->status = 0;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	71 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	72
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	73 static uint8_t fifo_empty(ymz_midi_fifo *fifo)
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	74 {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	75 return fifo->read == FIFO_EMPTY;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	76 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	77
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	78 static uint8_t fifo_read(ymz_midi_fifo *fifo)
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	79 {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	80 uint8_t ret = fifo->fifo[fifo->read++];
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	81 fifo->read &= 15;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	82 if (fifo->read == fifo->write) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	83 fifo->read = FIFO_EMPTY;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	84 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	85 return ret;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	86 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	87
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	88 static uint8_t fifo_write(ymz_midi_fifo *fifo, uint8_t value)
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	89 {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	90 uint8_t overflow = fifo->read == fifo->write;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	91 if (fifo->read == FIFO_EMPTY) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	92 fifo->read = fifo->write;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	93 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	94 fifo->fifo[fifo->write++] = value;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	95 fifo->write &= 15;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	96 return overflow;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	97 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	98
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	99 static uint8_t fifo_size(ymz_midi_fifo *fifo)
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	100 {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	101 if (fifo->read == FIFO_EMPTY) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	102 return 0;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	103 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	104 if (fifo->read == fifo->write) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	105 return 16;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	106 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	107 return (fifo->write - fifo->read) & 15;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	108 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	109
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	110 void ymz263b_run(ymz263b *ymz, uint32_t target_cycle)
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	111 {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	112 uint8_t timer_ctrl = ymz->base_regs[YMZ_TIMER_CTRL];
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	113 for (; ymz->cycle < target_cycle; ymz->cycle += ymz->clock_inc)
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	114 {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	115 if (timer_ctrl & BIT_ST0) {
2461 a25e8f304343 Fix handling of zero timer value Michael Pavone <pavone@retrodev.com> parents: 2460 diff changeset	116 ymz->timers[0]--;
a25e8f304343 Fix handling of zero timer value Michael Pavone <pavone@retrodev.com> parents: 2460 diff changeset	117 if (!ymz->timers[0]) {
2460 a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	118 ymz->timers[0] = ymz->base_regs[YMZ_TIMER0_HIGH] << 8 \| ymz->base_regs[YMZ_TIMER0_LOW];
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	119 ymz->status \|= STATUS_T0;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	120 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	121 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	122 if (timer_ctrl & BIT_STBC) {
2461 a25e8f304343 Fix handling of zero timer value Michael Pavone <pavone@retrodev.com> parents: 2460 diff changeset	123 ymz->timers[3]--;
a25e8f304343 Fix handling of zero timer value Michael Pavone <pavone@retrodev.com> parents: 2460 diff changeset	124 if (!ymz->timers[3]) {
2460 a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	125 ymz->timers[3] = ymz->base_regs[YMZ_TIMER1] << 8 & 0xF00;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	126 ymz->timers[3] \|= ymz->base_regs[YMZ_TIMER_BASE];
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	127
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	128 if (timer_ctrl & BIT_ST1) {
2461 a25e8f304343 Fix handling of zero timer value Michael Pavone <pavone@retrodev.com> parents: 2460 diff changeset	129 ymz->timers[1]--;
a25e8f304343 Fix handling of zero timer value Michael Pavone <pavone@retrodev.com> parents: 2460 diff changeset	130 if (!ymz->timers[1]) {
2460 a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	131 ymz->timers[1] = ymz->base_regs[YMZ_TIMER1] >> 4;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	132 ymz->status \|= STATUS_T1;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	133 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	134 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	135
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	136 if (timer_ctrl & BIT_ST2) {
2461 a25e8f304343 Fix handling of zero timer value Michael Pavone <pavone@retrodev.com> parents: 2460 diff changeset	137 ymz->timers[2]--;
a25e8f304343 Fix handling of zero timer value Michael Pavone <pavone@retrodev.com> parents: 2460 diff changeset	138 if (!ymz->timers[2]) {
2460 a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	139 ymz->timers[2] = ymz->base_regs[YMZ_TIMER2_HIGH] << 8 \| ymz->base_regs[YMZ_TIMER2_LOW];
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	140 ymz->status \|= STATUS_T2;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	141 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	142 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	143 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	144 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	145 if (!(ymz->midi_regs[0] & BIT_MTR_RST) && !fifo_empty(&ymz->midi_trs)) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	146 if (ymz->midi_transmit) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	147 --ymz->midi_transmit;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	148 } else {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	149 ymz->midi_transmit = MIDI_BYTE_DIVIDER - 1;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	150 //TODO: send this byte to MIDI device
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	151 uint8_t byte = fifo_read(&ymz->midi_trs);
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	152 printf("MIDI Transmit: %X\n", byte);
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	153 if (fifo_empty(&ymz->midi_trs)) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	154 ymz->status \|= STATUS_TRQ;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	155 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	156 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	157 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	158 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	159 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	160
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	161 uint32_t ymz263b_next_int(ymz263b *ymz)
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	162 {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	163 //TODO: Handle FIFO and MIDI receive interrupts
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	164 uint8_t enabled_ints = (~ymz->base_regs[YMZ_TIMER_CTRL]) & TIMER_INT_MASK;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	165 if (!(ymz->base_regs[YMZ_MIDI_CTRL] & (BIT_MTR_RST\|BIT_MSK_TRQ))) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	166 enabled_ints \|= STATUS_TRQ;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	167 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	168 if (!enabled_ints) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	169 return CYCLE_NEVER;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	170 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	171 //Handle currently pending interrupts
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	172 if (enabled_ints & ymz->status) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	173 return ymz->cycle;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	174 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	175 uint32_t ret = CYCLE_NEVER;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	176 if (enabled_ints & STATUS_TRQ) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	177 uint8_t bytes = fifo_size(&ymz->midi_trs);
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	178 if (bytes) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	179 ret = ymz->cycle + (ymz->midi_transmit + 1) * ymz->clock_inc;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	180 if (bytes > 1) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	181 ret += MIDI_BYTE_DIVIDER * ymz->clock_inc * (bytes - 1);
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	182 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	183 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	184 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	185 enabled_ints >>= 4;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	186 //If timers aren't already expired, interrupts can't fire unless the timers are enabled
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	187 enabled_ints &= ymz->base_regs[YMZ_TIMER_CTRL];
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	188 if (!(ymz->base_regs[YMZ_TIMER_CTRL] & BIT_STBC)) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	189 //Timer 1 and Timer 2 depend on the base timer
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	190 enabled_ints &= 1;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	191 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	192 if (enabled_ints & BIT_ST0) {
2461 a25e8f304343 Fix handling of zero timer value Michael Pavone <pavone@retrodev.com> parents: 2460 diff changeset	193 uint32_t t0 = ymz->cycle + (ymz->timers[0] ? ymz->timers[0] : 0x10000) * ymz->clock_inc;
2460 a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	194 if (t0 < ret) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	195 ret = t0;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	196 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	197 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	198 if (enabled_ints & (BIT_ST1\|BIT_ST2)) {
2461 a25e8f304343 Fix handling of zero timer value Michael Pavone <pavone@retrodev.com> parents: 2460 diff changeset	199 uint32_t base = ymz->cycle + (ymz->timers[3] ? ymz->timers[3] : 0x1000) * ymz->clock_inc;
2460 a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	200 if (base < ret) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	201 uint32_t load = (ymz->base_regs[YMZ_TIMER1] << 8 & 0xF00) \| ymz->base_regs[YMZ_TIMER_BASE];
2461 a25e8f304343 Fix handling of zero timer value Michael Pavone <pavone@retrodev.com> parents: 2460 diff changeset	202 if (!load) {
a25e8f304343 Fix handling of zero timer value Michael Pavone <pavone@retrodev.com> parents: 2460 diff changeset	203 load = 0x1000;
a25e8f304343 Fix handling of zero timer value Michael Pavone <pavone@retrodev.com> parents: 2460 diff changeset	204 }
2460 a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	205 if (enabled_ints & BIT_ST1) {
2461 a25e8f304343 Fix handling of zero timer value Michael Pavone <pavone@retrodev.com> parents: 2460 diff changeset	206 uint32_t t1 = (ymz->timers[1] ? ymz->timers[1] - 1 : 0xF) * load * ymz->clock_inc;
2460 a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	207 if (t1 < ret) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	208 ret = t1;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	209 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	210 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	211 if (enabled_ints & BIT_ST2) {
2461 a25e8f304343 Fix handling of zero timer value Michael Pavone <pavone@retrodev.com> parents: 2460 diff changeset	212 uint32_t t2 = (ymz->timers[2] ? ymz->timers[2] - 1 : 0xFFFF) * load * ymz->clock_inc;
2460 a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	213 if (t2 < ret) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	214 ret = t2;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	215 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	216 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	217 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	218 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	219 return ret;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	220 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	221
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	222 void ymz263b_address_write(ymz263b *ymz, uint8_t value)
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	223 {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	224 ymz->address = value;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	225 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	226
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	227 void ymz263b_data_write(ymz263b *ymz, uint32_t channel, uint8_t value)
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	228 {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	229 if (channel) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	230 if (ymz->address >= YMZ_PCM_PLAY_CTRL && ymz->address < YMZ_MIDI_CTRL) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	231 ymz->pcm[1].regs[ymz->address - YMZ_PCM_PLAY_CTRL] = value;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	232 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	233 } else {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	234 if (ymz->address < YMZ_PCM_PLAY_CTRL) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	235 ymz->base_regs[ymz->address] = value;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	236 } else if (ymz->address < YMZ_MIDI_CTRL) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	237 ymz->pcm[0].regs[ymz->address - YMZ_PCM_PLAY_CTRL] = value;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	238 } else {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	239 ymz->midi_regs[ymz->address - YMZ_MIDI_CTRL] = value;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	240 if (ymz->address == YMZ_MIDI_DATA) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	241 ymz->status &= ~STATUS_TRQ;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	242 if (fifo_empty(&ymz->midi_trs)) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	243 ymz->midi_transmit = MIDI_BYTE_DIVIDER - 1;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	244 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	245 fifo_write(&ymz->midi_trs, value);
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	246 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	247 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	248 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	249 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	250
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	251 uint8_t ymz263b_data_read(ymz263b *ymz, uint32_t channel)
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	252 {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	253 //TODO: Supposedly only a few registers are actually readable
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	254 if (channel) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	255 if (ymz->address >= YMZ_PCM_PLAY_CTRL && ymz->address < YMZ_MIDI_CTRL) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	256 return ymz->pcm[1].regs[ymz->address - YMZ_PCM_PLAY_CTRL];
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	257 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	258 } else {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	259 if (ymz->address < YMZ_PCM_PLAY_CTRL) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	260 return ymz->base_regs[ymz->address];
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	261 } else if (ymz->address < YMZ_MIDI_CTRL) {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	262 return ymz->pcm[0].regs[ymz->address - YMZ_PCM_PLAY_CTRL];
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	263 } else {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	264 return ymz->midi_regs[ymz->address - YMZ_MIDI_CTRL];
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	265 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	266 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	267 return 0XFF;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	268 }
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	269
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	270 uint8_t ymz263b_status_read(ymz263b *ymz)
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	271 {
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	272 uint8_t ret = ymz->status;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	273 ymz->status = 0;//&= ~(STATUS_T0\|STATUS_T1\|STATUS_T2);
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	274 return ret;
a4f8fa24764b Initial work on emulating the YMZ263B in the Copera Michael Pavone <pavone@retrodev.com> parents: diff changeset	275 }

Mercurial > repos > blastem

annotate ymz263b.c @ 2461:a25e8f304343