( blank )
:dev/r fff8 ( std read port )
:dev/w fff9 ( std write port )
:test 0010
;x 1 ;y 2
|0100 @RESET
#12 =x
#1234 =y
~x
~y
#ef =test
BRK
|c000 @FRAME BRK
|d000 @ERROR BRK
|FFFA .RESET .FRAME .ERROR