optional BRK signature on all 6502 CPUs, not just 65816 (also COP)

2026-04-25 06:17:58 +00:00 · 2023-02-24 22:40:29 -05:00
parent a299ef4210
commit cd8fa39066
3 changed files with 44 additions and 8 deletions
@@ -0,0 +1,36 @@
+; test of optional signature byte for BRK on all 6502-derived CPUs
+; and also COP on 65C816
+
+.setcpu "6502"
+brk ; 1 byte
+brk 0 ; 2 bytes
+brk $60 ; 2 bytes
+
+.setcpu "6502X"
+brk
+brk $60
+
+.setcpu "6502DTV"
+brk
+brk $60
+
+.setcpu "65SC02"
+brk
+brk $60
+
+.setcpu "65816"
+brk
+brk $60
+cop
+cop $60
+; WDM is a NOP that gives +2 PC, probably not useful to make its signature byte optional
+;wdm
+wdm $60
+
+.setcpu "4510"
+brk
+brk $60
+
+.setcpu "HuC6280"
+brk
+brk $60