famiyirl: ADC absolute

Signed-off-by: Matthias Gatto <[email protected]>
cosmo-ray · Apr 28, 2024 · 93156e4 · 93156e4
1 parent 56ae766
commit 93156e4
Show file tree

Hide file tree

Showing 3 changed files with 26 additions and 1 deletion.
diff --git a/modules/Universal-LPC-spritesheet b/modules/Universal-LPC-spritesheet
diff --git a/modules/famiyirl/init.c b/modules/famiyirl/init.c
@@ -441,11 +441,35 @@ static int process_inst(void)
 		goto out;
 	}
 	break;
+	case ADC_ab:
+	{
+		int addr = get_mem(++cpu.pc);
+		char old_sign = cpu.a & 0x80;
+
+		addr |= get_mem(++cpu.pc) << 8;
+		char res = get_mem(addr);
+		int check_carry = cpu.a + res;
+
+		cpu.a += res;
+		SET_CARY(check_carry > 255);
+		SET_OVERFLOW(old_sign != (cpu.a & 0x80));
+		SET_NEGATIVE(!!(0x80 & cpu.a));
+		SET_ZERO(!cpu.a);
+		cpu.cycle_cnt += 4;
+	}
+	break;
 	case ADC_im:
 	{
 		int addr = get_mem(++cpu.pc);
+		char old_sign = cpu.a & 0x80;
+
+		int check_carry = cpu.a + addr;
 
 		cpu.a += addr;
+		SET_CARY(check_carry > 255);
+		SET_OVERFLOW(old_sign != (cpu.a & 0x80));
+		SET_NEGATIVE(!!(0x80 & cpu.a));
+		SET_ZERO(!cpu.a);
 		cpu.cycle_cnt += 2;
 	}
 	break;

diff --git a/modules/famiyirl/opcode.h b/modules/famiyirl/opcode.h
@@ -28,6 +28,7 @@
   OPCODE(ROR, 0x62) //rotate right
   OPCODE(PLA, 0x68) //pull accumulator
   OPCODE(ADC_im, 0x69) //add with carry
+  OPCODE(ADC_ab, 0x6D) //add with carry
   OPCODE(BVS, 0x70) //branch on overflow set
   OPCODE(SEI, 0x78) //set interrupt disable
   OPCODE(STY, 0x80) //store Y
+8 −46		lpcs.lua
+ −		spritesheets/weapons/oversize/right hand/male/longsword-attack.png