From 90e6a4b13a7afc6e035dc645bc89c86a951391ed Mon Sep 17 00:00:00 2001 From: Michael Pavone Date: Sat, 31 Oct 2015 13:49:27 -0700 Subject: Small tweaks to timing of 68K/Z80 interactions based on latest tests --- blastem.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'blastem.c') diff --git a/blastem.c b/blastem.c index e4645eb..aaed215 100644 --- a/blastem.c +++ b/blastem.c @@ -473,6 +473,8 @@ m68k_context * io_write(uint32_t location, m68k_context * context, uint8_t value { genesis_context * gen = context->system; if (location < 0x10000) { + //Access to Z80 memory incurs a one 68K cycle wait state + context->current_cycle += MCLKS_PER_68K; if (!z80_enabled || z80_get_busack(gen->z80, context->current_cycle)) { location &= 0x7FFF; if (location < 0x4000) { @@ -591,6 +593,8 @@ uint8_t io_read(uint32_t location, m68k_context * context) uint8_t value; genesis_context *gen = context->system; if (location < 0x10000) { + //Access to Z80 memory incurs a one 68K cycle wait state + context->current_cycle += MCLKS_PER_68K; if (!z80_enabled || z80_get_busack(gen->z80, context->current_cycle)) { location &= 0x7FFF; if (location < 0x4000) { -- cgit v1.2.3