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| author | Michael Pavone <pavone@retrodev.com> | 2017-01-05 00:36:23 -0800 |
|---|---|---|
| committer | Michael Pavone <pavone@retrodev.com> | 2017-01-05 00:36:23 -0800 |
| commit | 25908ea88742215abdc04c491736e0061e99498e (patch) | |
| tree | e5f3a7781fb700c4924fc0d2b9e596c640a38a5e /sms.c | |
| parent | f04fcbb10860e4a8431e3ea70f46ade4280f7c9f (diff) | |
Implemented Mode 4 H conter latching
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 { |