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comparison io.c @ 911:73732ae76fa8

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IO port pins should read as high from the perspective of a device when they are set as inputs
author Michael Pavone <pavone@retrodev.com>
date Sun, 06 Dec 2015 15:42:36 -0800
parents c030e4af32b7
children 599e2861f484
comparison
equal deleted inserted replaced
910:c030e4af32b7 911:73732ae76fa8
1162 } 1162 }
1163 1163
1164 uint8_t io_data_read(io_port * port, uint32_t current_cycle) 1164 uint8_t io_data_read(io_port * port, uint32_t current_cycle)
1165 { 1165 {
1166 uint8_t control = port->control | 0x80; 1166 uint8_t control = port->control | 0x80;
1167 uint8_t th = control & port->output & 0x40; 1167 uint8_t output = (control & port->output) | (~control & 0xFF);
1168 uint8_t th = output & 0x40;
1168 uint8_t input; 1169 uint8_t input;
1169 switch (port->device_type) 1170 switch (port->device_type)
1170 { 1171 {
1171 case IO_GAMEPAD3: 1172 case IO_GAMEPAD3:
1172 { 1173 {
1205 input = ~input; 1206 input = ~input;
1206 break; 1207 break;
1207 } 1208 }
1208 case IO_MOUSE: 1209 case IO_MOUSE:
1209 { 1210 {
1210 uint8_t tr = control & port->output & TR; 1211 uint8_t tr = output & TR;
1211 if (th) { 1212 if (th) {
1212 if (tr) { 1213 if (tr) {
1213 input = 0x10; 1214 input = 0x10;
1214 } else { 1215 } else {
1215 input = 0; 1216 input = 0;