From 124a009d29c98d2f0eae2f9eafcbbf80aa42c348 Mon Sep 17 00:00:00 2001 From: Mike Pavone Date: Fri, 24 May 2013 00:26:27 -0700 Subject: Allow VDP/PSG writes from Z80 --- blastem.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) (limited to 'blastem.c') diff --git a/blastem.c b/blastem.c index 97c2ada..112637e 100644 --- a/blastem.c +++ b/blastem.c @@ -333,7 +333,14 @@ m68k_context * vdp_port_write(uint32_t vdp_port, m68k_context * context, uint16_ m68k_context * vdp_port_write_b(uint32_t vdp_port, m68k_context * context, uint8_t value) { - return vdp_port_write(vdp_port, context, vdp_port < 0x10 ? value | value << 8 : value); + return vdp_port_write(vdp_port, context, vdp_port < 0x10 ? value | value << 8 : ((vdp_port & 1) ? value : 0)); +} + +z80_context * z80_vdp_port_write(uint16_t vdp_port, z80_context * context, uint8_t value) +{ + genesis_context * gen = context->system; + vdp_port_write_b(vdp_port, gen->m68k, value); + return context; } uint16_t vdp_port_read(uint32_t vdp_port, m68k_context * context) -- cgit v1.2.3