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Implement edab

--- a/z80.c

+++ b/z80.c

@@ -557,6 +557,15 @@

 		if (s[rL] + u > 0xff) s[rF] |= (FLAGC|FLAGH); else s[rF] &= ~(FLAGC|FLAGH);

 		if (((s[rL] + u) & 0x07) ^ s[rB]) s[rF] |= FLAGV; else s[rF] &= ~FLAGV;

 		return 16;

+	case 0xab:

+		s[rB]--;

+		u = z80read(HL());

+		z80write(s[rC], u);

+		addhl(-1);

+		if (u & 0x80) s[rF] |= FLAGN; else s[rF] &= ~FLAGN;

+		if (s[rL] + u > 0xff) s[rF] |= (FLAGC|FLAGH); else s[rF] &= ~(FLAGC|FLAGH);

+		if (((s[rL] + u) & 0x07) ^ s[rB]) s[rF] |= FLAGV; else s[rF] &= ~FLAGV;

+		return 16;

 	}

 	sysfatal("undefined z80 opcode ed%.2x at pc=%#.4x", op, curpc);

 	return 0;

-- 

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