uxn/examples/core.usm

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( define some variables in the zero-page )
;var1
;var2
;var3
,22 ,var1 STR ( store 0x22 in var1 )
,var1 LDR ( load var2, put value on stack )
@0100 ( store program reset after zero-page )
:RESET ( --- )
BRK
@c000 ( much further.. )
:FRAME ( --- )
BRK
@d000 ( further still.. )
:ERROR ( --- )
BRK
@FFFA ( vectors, last 3 shorts )
.RESET
.FRAME
.ERROR