+++ /dev/null
-/* Is this an MMC3 workalike piece of hardware, with the addition of
- a register at $4120 or does it have only partial MMC3 functionality?
- A good test would be to see if commands 6 and 7 can change PRG banks
- and of course test the regs >=$c000, on the real cart.
-*/
-#include "mapinc.h"
-
-#define cmd mapbyte1[0]
-static DECLFW(Mapper189_write)
-{
- //if(A>=0xc000) printf("$%04x:$%02x\n",A,V);
- if((A&0xF100)==0x4100) ROM_BANK32(V>>4);
- else if((A&0xF100)==0x6100) ROM_BANK32(V&3);
- else switch(A&0xE001)
- {
- case 0xa000:MIRROR_SET(V&1);break;
- case 0x8000:cmd=V;break;
- case 0x8001:switch(cmd&7)
- {
- case 0:VROM_BANK2(0x0000,V>>1);break;
- case 1:VROM_BANK2(0x0800,V>>1);break;
- case 2:VROM_BANK1(0x1000,V);break;
- case 3:VROM_BANK1(0x1400,V);break;
- case 4:VROM_BANK1(0x1800,V);break;
- case 5:VROM_BANK1(0x1C00,V);break;
- }
- case 0xc000:IRQLatch=V;break;
- case 0xc001:IRQCount=IRQLatch;break;
- case 0xe000:IRQa=0;X6502_IRQEnd(FCEU_IQEXT);break;
- case 0xe001:IRQa=1;break;
- break;
-
- }
-}
-void m189irq(void)
-{
- if(IRQa)
- {
- if(IRQCount)
- {
- IRQCount--;
- if(!IRQCount) X6502_IRQBegin(FCEU_IQEXT);
- }
- }
-
-}
-void Mapper189_init(void)
-{
- GameHBIRQHook=m189irq;
- SetWriteHandler(0x4120,0xFFFF,Mapper189_write);
- SetReadHandler(0x6000,0x7FFF,0);
- ROM_BANK32(0);
-}
-
-