shithub: sms

Download patch

ref: 3e48e5e879677f7b285803feb799ad4a31ceeffb
parent: 3e6ad74336a451061ca2be070565e34f7215c2de
author: Jean-André Santoni <jean.andre.santoni@gmail.com>
date: Thu Aug 28 05:30:42 EDT 2025 

have z80.c compiled


--- a/mkfile
+++ b/mkfile
@@ -3,6 +3,7 @@
 BIN=/$objtype/bin/games
 TARG=sms
 OFILES=\
+	z80.$O\
 	mem.$O\
 	vdp.$O\
 	psg.$O\
--- a/z80.c
+++ b/z80.c
@@ -193,7 +193,7 @@
 static int
 branch(int cc, int t)
 {
-	u16int v = (int8_t)fetch8();
+	u16int v = (s8int)fetch8();
 	if(!cc)
 		return t + 7;
 	pc += v;
@@ -492,12 +492,12 @@
 		v = z80read(HL());
 		z80write(HL(), v >> 4 | s[rA] << 4);
 		s[rA] = s[rA] & 0xf0 | v & 0x0f;
-#if 0
+		if (0){
 	case 0x6f:
 			v = z80read(HL());
 			z80write(HL(), v << 4 | s[rA] & 0xf);
 			s[rA] = s[rA] & 0xf0 | v >> 4;
-#endif
+		}
 		s[rF] &= FLAGC;
 		if(s[rA] == 0)
 			s[rF] |= FLAGZ;
@@ -570,7 +570,6 @@
 		return 16;
 	}
 	sysfatal("undefined z80 opcode ed%.2x at pc=%#.4x", op, curpc);
-	return 0;
 }
 
 static int
@@ -645,7 +644,6 @@
 	case 0x2e: ix[n] = ix[n] & 0xff00 | fetch8(); return 11;
 	}
 	sysfatal("undefined z80 opcode %.2x%.2x at pc=%#.4x", n ? 0xfd : 0xdd, op, curpc);
-	return 0;
 }
 
 int
@@ -655,7 +653,7 @@
 	u16int v, w;
 
 	if((z80bus & RESET) != 0){
-		printf("reset\n");
+		print("reset");
 		curpc = pc = 0;
 		intm = 0;
 		ipage = 0;
@@ -662,18 +660,18 @@
 		return 1;
 	}
 	if((z80bus & BUSACK) != 0){
-		printf("busack\n");
+		print("busack");
 		if((z80bus & BUSREQ) == 0)
 			z80bus &= ~BUSACK;
 		return 1;
 	}
 	if((z80bus & BUSREQ) != 0){
-		printf("busreq\n");
+		print("busreq");
 		z80bus |= BUSACK;
 		return 1;
 	}
 	if(z80irq != 0 && (intm & 0x80) != 0){
-		//printf("irq\n");
+		print("irq");
 		push16(pc);
 		intm &= 0x3f;
 		switch(intm & 3){
@@ -685,9 +683,9 @@
 		}
 	}
 	curpc = pc;
-	// printf("%x AF %.2x%.2x BC %.2x%.2x DE %.2x%.2x HL %.2x%.2x IX %.4x IY %.4x\n", curpc, s[rA], s[rF], s[rB], s[rC], s[rD], s[rE], s[rH], s[rL], ix[0], ix[1]);
+	// print("%x AF %.2x%.2x BC %.2x%.2x DE %.2x%.2x HL %.2x%.2x IX %.4x IY %.4x", curpc, s[rA], s[rF], s[rB], s[rC], s[rD], s[rE], s[rH], s[rL], ix[0], ix[1]);
 	op = fetch8();
-	// printf("op: %x\n", op);
+	// print("op: %x", op);
 	switch(op >> 6){
 	case 1: return move(op >> 3 & 7, op & 7);
 	case 2: return alu(op >> 3 & 7, op & 7);
@@ -889,5 +887,4 @@
 	case 0xff: return call2(0x38, 1);
 	}
 	sysfatal("undefined z80 opcode %#.2x at pc=%#.4x", op, curpc);
-	return 0;
 }
-- 
⑨