From 25908ea88742215abdc04c491736e0061e99498e Mon Sep 17 00:00:00 2001 From: Michael Pavone Date: Thu, 5 Jan 2017 00:36:23 -0800 Subject: Implemented Mode 4 H conter latching --- sms.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'sms.c') diff --git a/sms.c b/sms.c index 170f2ce..b74b6dd 100644 --- a/sms.c +++ b/sms.c @@ -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 { -- cgit v1.2.3