93 lines
1.6 KiB
NASM
93 lines
1.6 KiB
NASM
;/* ------------------------------------------------------------------------
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;System : Manx Aztec C65 Version 3.2b
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; MS-DOS cross-development environment
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;Platform : Apple IIe 128K PRODOS 8
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;Program : clear1.asm
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;Description : G2 Library Routine
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;
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; HGR routine from original Aztec C distribution
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; Slightly Modified by me
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; Compatibility with Aztec C Programs that use
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; Page 1 HGR (shell programs, DOS 3.3 programs)
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;
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;Original : Dec 30, 1990
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;Probably by : Jim Goodnow
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;
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;Modified by : Bill Buckels
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;Revision Date : February 2013
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;
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;Licence : You may use this code for whatever you wish as long
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; as you agree that Bill Buckels has no warranty or
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; liability obligations whatsoever from said use.
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;------------------------------------------------------------------------ */
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R0 equ 8
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SP equ 2
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sclr lda #0 ;store ptr in R0
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sta R0
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lda #$20
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sta R0+1
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ldy #0
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loop
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lda R0+2
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sta (R0),Y
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iny
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lda R0+3
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sta (R0),Y
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iny
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bne loop
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ldx R0+1
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inx
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stx R0+1
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txa
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cmp #$40
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bcc loop
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lda $c057 ;high res
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lda $c054 ;page 1
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lda $c052 ;full graphics
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lda $c050 ;graphics
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rts
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public sblack_
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sblack_
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lda #0
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sta R0+2
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sta R0+3
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jmp sclr
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public sblue_
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sblue_
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lda #$d5
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sta R0+2
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lda #$aa
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sta R0+3
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jmp sclr
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public sviolet_
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sviolet_
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lda #$55
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sta R0+2
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lda #$2a
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sta R0+3
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jmp sclr
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public sgreen_
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sgreen_
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lda #$2a
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sta R0+2
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lda #$55
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sta R0+3
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jmp sclr
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public sred_
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sred_
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lda #$aa
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sta R0+2
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lda #$d5
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sta R0+3
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jmp sclr
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public swhite_
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swhite_
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lda #$7f
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sta R0+2
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lda #$7f
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sta R0+3
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jmp sclr
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