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added mapper ram reading, this gets some more games in action 52 to work

This commit is contained in:
qeed 2009-09-27 13:01:36 +00:00
parent 18bbb65d4b
commit 0b96e69ca2
1 changed files with 31 additions and 16 deletions
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47
src/mappers/228.cpp
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@ -20,34 +20,49 @@
#include "mapinc.h"
//16 bits of ram in total
//only use bottom 4 bits as ram
static int mapper228_ram[4];
static DECLFR(Mapper228_read)
{
return mapper228_ram[A & 3] & 0xF;
}
static DECLFW(Mapper228_write)
{
uint32 page,pagel,pageh;
uint32 page, pagel, pageh;
MIRROR_SET((A>>13)&1);
//write to ram
if (A < 0x6000)
{
mapper228_ram[A & 3] = V;
return;
}
MIRROR_SET((A >> 13) & 1);
page = (A >> 7) & 0x3F;
page=(A>>7)&0x3F;
//printf("%04x\n",A);
if((page&0x30)==0x30)
page-=0x10;
pagel=pageh=(page<<1) + (((A>>6)&1)&((A>>5)&1));
pageh+=((A>>5)&1)^1;
if( (page & 0x30) == 0x30)
page -= 0x10;
ROM_BANK16(0x8000,pagel);
ROM_BANK16(0xC000,pageh);
VROM_BANK8( (V&0x3) | ((A&0xF)<<2) );
pagel = pageh = (page << 1) + (((A >> 6) & 1) & ((A >> 5) & 1));
pageh += ((A >> 5) & 1) ^ 1;
ROM_BANK16(0x8000,pagel);
ROM_BANK16(0xC000,pageh);
VROM_BANK8( (V&0x3) | ((A&0xF)<<2) );
}
static void A52Reset(void)
{
Mapper228_write(0,0);
Mapper228_write(0x8000, 0);
}
void Mapper228_init(void)
{
MapperReset=A52Reset;
A52Reset();
SetWriteHandler(0x8000,0xffff,Mapper228_write);
MapperReset=A52Reset;
A52Reset();
SetWriteHandler(0x8000, 0xFFFF, Mapper228_write);
SetWriteHandler(0x4020, 0x5FFF, Mapper228_write);
SetReadHandler (0x4020, 0x5FFF, Mapper228_read);
}