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