22 lines
1.1 KiB
Plaintext
22 lines
1.1 KiB
Plaintext
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; nrjasm standard library starts here
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; custom macros always take 3 values, usually cell addresses (referred to as %A, %B and %C) and defined between .def and .end (no nesting allowed)
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; custom macros are always expanded before the elementary macros
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; if %C is not passed, it is replaced with NXT
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; if %B and/or %A is not passed, it is replaced with HLT
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.def .lbl ; define labels
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.var %A FREE ; allocate a variable with the name in %A, then set it to the next instruciton address:
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.set @%A NXT ; %A is directly substituted as text, so we can use it after the dereferencing operator
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.end
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; define a reusable buffer variable for our following macros
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.var setbuf FREE ; we don't care which address it will actually be
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.def MOV ; transfer one cell to another, usage: MOV dst src
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@setbuf HLT NXT ; first, zero out the setbuf variable by performing NOR with 0xFFFF
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%A HLT NXT ; then, zero out the destination cell by performing NOR with 0xFFFF
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@setbuf %B NXT ; then, set setbuf variable to the inverted source value
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%A @setbuf %C ; finally, set destination cell to the inverted setbuf value ( = source value)
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.end
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