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comparison xband.c @ 1468:17c1c30e0d6f

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Added detection of XBAND test ROMs. None seem to actually work with my limited FRED chip implementation though
author Michael Pavone <pavone@retrodev.com>
date Mon, 09 Oct 2017 07:42:33 -0700
parents adb62000d296
children
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1466:f2ee46d08b01 1468:17c1c30e0d6f
81 #define dputs 81 #define dputs
82 #endif 82 #endif
83 83
84 uint8_t xband_detect(uint8_t *rom, uint32_t rom_size) 84 uint8_t xband_detect(uint8_t *rom, uint32_t rom_size)
85 { 85 {
86 //Internal ROM is 512KB, accept larger ones for overdumps and custom firmware 86 if (rom_size < 0x200) {
87 if (rom_size < (512*1024)) {
88 return 0; 87 return 0;
89 } 88 }
90
91 //ROM has no standard header, but does have a jump at $100
92 if (rom[0x100] != 0x4E || rom[0x101] != 0xF9) {
93 return 0;
94 }
95 89
96 //product ID is all NULL 90 //product ID is all NULL
97 for (int i = GAME_ID_OFF; i <= (GAME_ID_OFF + GAME_ID_LEN); i++) 91 for (int i = GAME_ID_OFF; i <= (GAME_ID_OFF + GAME_ID_LEN); i++)
98 { 92 {
99 if (rom[i]) { 93 if (rom[i]) {
100 return 0; 94 return 0;
101 } 95 }
102 } 96 }
97
98 if (!memcmp(rom+8, "DAVE", 4)) {
99 //XBAND test roms
100 return 1;
101 }
102
103 //Internal ROM is 512KB, accept larger ones for overdumps and custom firmware
104 if (rom_size < (512*1024)) {
105 return 0;
106 }
107
108 //ROM has no standard header, but does have a jump at $100
109 if (rom[0x100] != 0x4E || rom[0x101] != 0xF9) {
110 return 0;
111 }
112
113
103 return 1; 114 return 1;
104 } 115 }
105 116
106 static xband *get_xband(genesis_context *gen) 117 static xband *get_xband(genesis_context *gen)
107 { 118 {