shithub: riscv

Info  •  Files  •  Log  •  Branches

games/nes: added uxrom (mapper 2)

--- a/sys/src/games/nes/mem.c

+++ b/sys/src/games/nes/mem.c

@@ -138,6 +138,36 @@

 }

 static void

+uxrom(int p, u8int v)

+{

+	static u8int b;

+	

+	if(p < 0)

+		switch(p){

+		case INIT:

+			prgsh = 14;

+			chrsh = 13;

+			prgb[1] = prg + (nprg - 1) * 0x4000;

+			chrb[0] = chr;

+			break;

+		case SAVE:

+			put8(b);

+			return;

+		case RSTR:

+			b = get8();

+			break;

+		case SCAN:

+			return;

+		default:

+			nope(p);

+			return;

+		}

+	else

+		b = v % nprg;

+	prgb[0] = prg + b * 0x4000;

+}

+

+static void

 mmc3(int p, u8int v)

 {

 	static u8int m, b[8], l, n, en;

@@ -258,6 +288,7 @@

 void (*mapper[256])(int, u8int) = {

 	[0] nrom,

 	[1] mmc1,

+	[2] uxrom,

 	[4] mmc3,

 	[7] axrom,

 };