; Tests that the CPU stops when it meets a byte it cannot decode.
;
; CHOSEN AWAY FROM HALT, because the bytes next to it get used. This said 0xFE for
; a long time, and then 0xFE became WAIT - so the test stopped faulting and started
; SLEEPING. It hung instead of failing, which is the worst way for a test to notice
; that the thing it was testing had moved.
;
; 0xFD is not an instruction. Placing it in the Program Segment as a literal gets
; it past the assembler, which is the only way to build a program containing one.
;
; The CPU should raise the Fault Flag, halt, and leave the Program Counter pointing
; at the offending byte rather than stepping over it and carrying on. The emulator
; then reports what it was and where, and exits non zero.

#Program

start:
  INIA 0d65     ; Something harmless first, so the fault is not at address zero.
  0xFD          ; Not an instruction.
  HALT          ; Never reached.