DAT is the de-facto way to do this.
DAT <string literal | int literal> initializes a contiguous block of memory with character values or literal values.
Example:
:data DAT "a string literal followed by two integer literals", 42, 0x30
Labels can be used wherever literal integers can (except in a storage directive).
SET X, answer ; X = 5
SET J, 1
SET Y, [answer+J] ; Y = 66
:answer DAT 42, 0x42
BRK is the de-facto way to halt the program execution.
SET X, 42 ; 7c31 2a
BRK ; 0000
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SET X, [PC]is an invalid operation. Currently if you write this the assembler will generate a junk value. There's the option to make this a semantic error, but it's probably best that it be a syntax error. -
Referencing undefined labels doesn't throw an error. It will simply give you a 0 back for that label. This is a semantic error that needs to be added.
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Count cycles.
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Add video memory extension. Will need to have some actions be in the IO monad and therefore I'll need to make use of StateT instead of plain-old State.
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Probably will change HLT to BRK at some point if that gains more traction. I like HLT because it's reminiscent of the halting problem.
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Add support for basic arithmetic expressions wherever literals can be used.
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Add support for using labels in storage directives (allowing for static computation of the size of a code block).