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27 lines
935 B
Plaintext
27 lines
935 B
Plaintext
; C02 library test.h02 assembly language subroutines
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; Requires external functions
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; external zero page locations SRCLO and srchi
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; and external locations RANDOM, RDSEED, TEMP0, TEMP1, and TEMP2.
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;func(aa,xx,yy) - FUNCtion description
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;Args: A = First arguments
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; Y,X = Address argument
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;Sets: ARG0 = First argument
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; ADRLO,ADRLHI = Address argument
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;Uses: VAR0 = First Return Value
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; VAR2 = Second Return Value
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; VAR3 = Third Return Value
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;Affects: N,Z,C
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;Returns: A = First Return Value
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; Y = Second Return Value
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; X = Third Return Value
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FUNC: STA ARG0 ;Save First Argument
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STY ADRHI ;Save Address MSB
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STX ADRLO ;Save Address LSB
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LDA VAR0 ;Load First Return Value
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LDY VAR1 ;Load Second Return Value
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LDX VAR2 ;Load Third Return Value
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TYA ;Copy Second Parameter into Accumulator
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RTS
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