diff options
Diffstat (limited to 'sms.c')
| -rw-r--r-- | sms.c | 11 |
1 files changed, 11 insertions, 0 deletions
@@ -12,8 +12,19 @@ static void *memory_io_write(uint32_t location, void *vcontext, uint8_t value) z80_context *z80 = vcontext; sms_context *sms = z80->system; if (location & 1) { + uint8_t fuzzy_ctrl_0 = sms->io.ports[0].control, fuzzy_ctrl_1 = sms->io.ports[1].control; sms->io.ports[0].control = (~value) << 5 & 0x60; + fuzzy_ctrl_0 |= sms->io.ports[0].control; sms->io.ports[1].control = (~value) << 3 & 0x60; + fuzzy_ctrl_1 |= sms->io.ports[1].control; + if ( + (fuzzy_ctrl_0 & 0x40 & (sms->io.ports[0].output ^ (value << 1)) & (value << 1)) + || (fuzzy_ctrl_0 & 0x40 & (sms->io.ports[1].output ^ (value >> 1)) & (value >> 1)) + ) { + //TH is an output and it went from 0 -> 1 + vdp_run_context(sms->vdp, z80->current_cycle); + vdp_latch_hv(sms->vdp); + } io_data_write(sms->io.ports, value << 1, z80->current_cycle); io_data_write(sms->io.ports + 1, value >> 1, z80->current_cycle); } else { |