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[fceu.git] / mappers / 215.c
CommitLineData
d97315ac 1/*
2#include "mapinc.h"
3
4static uint8 cmdin;
5static uint8 cmd;
6static uint8 regs[8];
7static uint8 master,chrm;
8
9static void DoPRG215(void)
10{
11 if(master&0x80)
12 {
13 setprg16(0x8000,master&0x1F);
14 setprg16(0xc000,master&0x1F);
15 }
16 else
17 {
18 setprg8(0x8000,regs[4]); 6
19 setprg8(0xA000,regs[6]); 7 0, 2, 5, 3, 6, 1, 7, 4
20 setprg8(0xC000,~1);
21 setprg8(0xE000,~0);
22 }
23
24}
25
26static void DoCHR215(void)
27{
28 uint32 base=(cmd&0x80)<<5;
29 int orie=(chrm&0x4)<<6;
30
31 setchr2(0x0000^base,(orie|regs[0])>>1); 0
32 setchr2(0x0800^base,(orie|regs[5])>>1); 1
33
34 setchr1(0x1000,orie|regs[1]); 2
35 setchr1(0x1400,orie|regs[3]); 3
36 setchr1(0x1800,orie|regs[7]); 4
37 setchr1(0x1c00,orie|regs[2]); 5
38}
39
40static DECLFW(Write215_write)
41{
42 switch(A&0xF001)
43 {
44 case 0xF001:IRQCount=V+2;break;
45 case 0xF000:X6502_IRQEnd(FCEU_IQEXT);break;
46 }
47 if(A==0x5000)
48 {
49 master=V;
50 DoPRG215();
51// DoCHR215();
52 }
53 else if(A==0x5001)
54 {
55 chrm=V;
56 DoCHR215();
57 }
58 else
59 switch(A&0xE001)
60 {
61 case 0xC000:setmirror(((V|(V>>7))&1)^1);break;
62 case 0xa000:cmd=V;cmdin=1;DoCHR215();break;
63 case 0x8001:if(!cmdin) break;
64 regs[cmd&7]=V;
65 DoPRG215();
66 DoCHR215();
67 cmdin=0;
68 break;
69 }
70}
71
72static void hooko215(void)
73{
74 if(IRQCount)
75 {
76 IRQCount--;
77 if(!IRQCount)
78 {
79 X6502_IRQBegin(FCEU_IQEXT);
80 }
81 }
82}
83
84void Mapper215_init(void)
85{
86 int x;
87 for(x=0;x<8;x++) regs[x]=0;
88 master=chrm=cmd=cmdin=IRQCount=0;
89 GameHBIRQHook=hooko215;
90 SetReadHandler(0x8000,0xFFFF,CartBR);
91 SetWriteHandler(0x5000,0xFFFF,Write215_write);
92 DoPRG215();
93 DoCHR215();
94}
95
96*/