The-Homebrew-Cloud/Genesis-Plus-GX
2
0
Fork 0
mirror of https://github.com/ekeeke/Genesis-Plus-GX.git synced 2024-11-10 21:05:12 +01:00
Code Issues Packages Projects Releases Wiki Activity

[Core/CPU] added Z80 wait-states on 68k bus access (fixes Remute Red Eyes demo)

Browse Source
This commit is contained in:
ekeeke 2020-04-04 15:27:30 +02:00
parent ec3c90e3bc
commit 7b52165dd5
2 changed files with 12 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
core/memz80.c
View File

@ -5,7 +5,7 @@
* Support for SG-1000, Mark-III, Master System, Game Gear & Mega Drive ports access
*
* Copyright (C) 1998-2003 Charles Mac Donald (original code)
* Copyright (C) 2007-2016 Eke-Eke (Genesis Plus GX)
* Copyright (C) 2007-2020 Eke-Eke (Genesis Plus GX)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met:
@ -111,6 +111,8 @@ unsigned char z80_memory_r(unsigned int address)
{
if ((address >> 8) == 0x7F)
{
/* average Z80 wait-states when accessing 68k area */
Z80.cycles += 3 * 15;
return (*zbank_memory_map[0xc0].read)(address);
}
return z80_unused_r(address);
@ -118,6 +120,9 @@ unsigned char z80_memory_r(unsigned int address)
default: /* $8000-$FFFF: 68k bank (32K) */
{
/* average Z80 wait-states when accessing 68k area */
Z80.cycles += 3 * 15;
address = zbank | (address & 0x7FFF);
if (zbank_memory_map[address >> 16].read)
{
@ -158,6 +163,8 @@ void z80_memory_w(unsigned int address, unsigned char data)
case 0x7F: /* $7F00-$7FFF: VDP */
{
/* average Z80 wait-states when accessing 68k area */
Z80.cycles += 3 * 15;
(*zbank_memory_map[0xc0].write)(address, data);
return;
}
@ -172,6 +179,9 @@ void z80_memory_w(unsigned int address, unsigned char data)
default: /* $8000-$FFFF: 68k bank (32K) */
{
/* average Z80 wait-states when accessing 68k area */
Z80.cycles += 3 * 15;
address = zbank | (address & 0x7FFF);
if (zbank_memory_map[address >> 16].write)
{

2
core/memz80.h
View File

@ -5,7 +5,7 @@
* Support for SG-1000, Mark-III, Master System, Game Gear & Mega Drive ports access
*
* Copyright (C) 1998-2003 Charles Mac Donald (original code)
* Copyright (C) 2007-2016 Eke-Eke (Genesis Plus GX)
* Copyright (C) 2007-2020 Eke-Eke (Genesis Plus GX)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met: