Mercurial > repos > blastem
diff sms.c @ 1154:c83ec07ddbac
Implemented Mode 4 H conter latching
| author | Michael Pavone <pavone@retrodev.com> |
|---|---|
| date | Thu, 05 Jan 2017 00:36:23 -0800 |
| parents | 6b0da6021544 |
| children | c4ea535cf57e |
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--- a/sms.c Thu Jan 05 00:08:28 2017 -0800 +++ b/sms.c Thu Jan 05 00:36:23 2017 -0800 @@ -12,8 +12,19 @@ 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 {