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games/gb: fix gbc dma

--- a/sys/src/games/gb/dat.h

+++ b/sys/src/games/gb/dat.h

@@ -69,10 +69,10 @@

 	WX = 0x4B,

 	KEY1 = 0x4D,

 	VBK = 0x4F,

-	HDMASL = 0x51,

-	HDMASH = 0x52,

-	HDMADL = 0x53,

-	HDMADH = 0x54,

+	HDMASH = 0x51,

+	HDMASL = 0x52,

+	HDMADH = 0x53,

+	HDMADL = 0x54,

 	HDMAC = 0x55,

 	BCPS = 0x68,

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

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

@@ -549,7 +549,7 @@

 	u16int sa, da;

 	sa = (reg[HDMASL] | reg[HDMASH] << 8) & 0xfff0;

-	da = (reg[HDMADL] | reg[HDMADH] << 8) & 0x0ff0;

+	da = (reg[HDMADL] | reg[HDMADH] << 8) & 0x1ff0 | 0x8000;

 	for(i = 0; i < 16; i++)

 		memwrite(da++, memread(sa++));

 	reg[HDMASL] += 16;

-- 

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