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comparison sms.c @ 1148:80ef49539550

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Fix reading from second controller port in SMS mode
author Michael Pavone <pavone@retrodev.com>
date Tue, 03 Jan 2017 23:03:30 -0800
parents d4d770cfbc62
children 6b0da6021544
comparison
equal deleted inserted replaced
1147:06468b25a543 1148:80ef49539550
84 { 84 {
85 z80_context *z80 = vcontext; 85 z80_context *z80 = vcontext;
86 sms_context *sms = z80->system; 86 sms_context *sms = z80->system;
87 if (location == 0xC0 || location == 0xDC) { 87 if (location == 0xC0 || location == 0xDC) {
88 uint8_t port_a = io_data_read(sms->io.ports, z80->current_cycle); 88 uint8_t port_a = io_data_read(sms->io.ports, z80->current_cycle);
89 uint8_t port_b = io_data_read(sms->io.ports, z80->current_cycle); 89 uint8_t port_b = io_data_read(sms->io.ports+1, z80->current_cycle);
90 return (port_a & 0x3F) | (port_b << 6); 90 return (port_a & 0x3F) | (port_b << 6);
91 } 91 }
92 if (location == 0xC1 || location == 0xDD) { 92 if (location == 0xC1 || location == 0xDD) {
93 uint8_t port_a = io_data_read(sms->io.ports, z80->current_cycle); 93 uint8_t port_a = io_data_read(sms->io.ports, z80->current_cycle);
94 uint8_t port_b = io_data_read(sms->io.ports, z80->current_cycle); 94 uint8_t port_b = io_data_read(sms->io.ports+1, z80->current_cycle);
95 return (port_a & 0x40) | (port_b >> 2 & 0xF) | (port_b << 1 & 0x80) | 0x10; 95 return (port_a & 0x40) | (port_b >> 2 & 0xF) | (port_b << 1 & 0x80) | 0x10;
96 } 96 }
97 return 0xFF; 97 return 0xFF;
98 } 98 }
99 99