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4b46b78e34
Copied the extension script tutorial files out of the Scripts directory and into the Tutorial directory. This makes more sense, and makes it possible to expand the script sample without altering the tutorial. Reverted the Scripts sample to be an actual sample, rather than a tutorial. Renumbered the last two tutorials and added them to the ToC. This gives them actual numbers rather than treating them as add-ons to the advanced tutorial. Moved the source files for the tutorial binaries into a subdirectory to reduce clutter. This does mean we have two separate copies of the inline string sample plugins, but that's an artifact of our attempts at security.
115 lines
2.1 KiB
ArmAsm
115 lines
2.1 KiB
ArmAsm
; Copyright 2018 faddenSoft. All Rights Reserved.
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; See the LICENSE.txt file for distribution terms (Apache 2.0).
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;
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; Assembler: Merlin 32
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INPUT equ $3000
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OUTPUT equ $0400
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PTR1 equ $02
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PTR2 equ $04
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START equ $2000
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org START-2
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dw START
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sec
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ror A
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bmi skipstr
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string0 asc 'first string',00
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string1 asc 'another string',00
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string2 asc 'string the third',00
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string3 asc 'last string',00
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skipstr
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lda #<stringtab
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sta PTR1
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lda #>stringtab
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sta PTR1+1
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jsr thing
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and #$03
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asl A
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tay
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lda (PTR1),y
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sta PTR2
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iny
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lda (PTR1),y
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sta PTR2+1
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ldy #$ff
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]loop iny
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lda (PTR2),y
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beq copydone
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ora #$80
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sta OUTPUT,y
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bne ]loop ;always taken
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stringtab
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dw string0
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dw string1
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dw string2
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dw string3
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copydone
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jsr PrintInlineZString
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asc 'Embedded!',00
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lda #$ff ;self-modifying code example
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sta _mod+1
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_mod lda #$00
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bne skipbrk
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middat ds 4
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outdat ds 1
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skipbrk
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lda middat ;nearby-label example
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ora middat+1
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and middat+2
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eor middat+3
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ldx #$00 ;embedded instruction example
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dfb $2c
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rebr ldx #$01
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sta outdat
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lda INPUT
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lsr A
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lsr A
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lsr A
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lsr A
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sta INPUT
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bne rebr
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rts
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thing
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lda INPUT
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rts
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PrintInlineZString
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pla
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sta PTR1
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pla
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sta PTR1+1
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ldy #$01
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:loop lda (PTR1),Y
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beq strend
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ora #$80
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jsr $FDED
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iny
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bne :loop
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strend tya
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clc
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adc PTR1
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sta PTR1
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lda PTR1+1
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adc #$00
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pha
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lda PTR1
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pha
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rts
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