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diff emu/iset.c @ 42:792da050d8c4 tip

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more dox
author james <jb302@eecs.qmul.ac.uk>
date Tue, 22 Apr 2014 14:25:14 +0100
parents 2e35be400012
children
line wrap: on
line diff
--- a/emu/iset.c	Tue Apr 22 00:57:06 2014 +0100
+++ b/emu/iset.c	Tue Apr 22 14:25:14 2014 +0100
@@ -898,19 +898,28 @@
 /* 0xF8 - MUL R0, R1 */
 void
 MUL(void) {
- /* implement me */    
+    tmpw = regs[R0] * regs[R1];
+    regs[R0] = GHIGH(tmpw);
+    regs[R1] = GLOW(tmpw);
 }
 
 /* 0xF9 - DIV R0, R1 */
 void
 DIV(void) {
- /* implement me */   
+    tmpw = regs[R0] / regs[R1];
+    regs[R0] = GHIGH(tmpw);
+    regs[R1] = GLOW(tmpw);
 }
 
 /* 0xFA - DA A */
 void
 DA(void) {
- /* implement me */
+ if (((A & 0xF) > 9) | get_flag(AC) == 1) {
+     A = A + 6;
+ }
+ if (((A & 0xF0) > 9) | get_flag(C) == 1) {
+     A = A + 0x60;
+ }
 }
 
 /* 0xFC - IN port_addr */
@@ -934,5 +943,5 @@
 /* 0xFF - HLT */
 void
 HLT(void) {
- /* implement me */
+ exit(0);
 }