mirror of
https://github.com/fadden/6502bench.git
synced 2024-09-11 20:54:37 +00:00
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.
63 lines
1.2 KiB
ArmAsm
63 lines
1.2 KiB
ArmAsm
; Copyright 2018 faddenSoft. All Rights Reserved.
|
|
; See the LICENSE.txt file for distribution terms (Apache 2.0).
|
|
;
|
|
; Assembler: Merlin 32
|
|
|
|
INPUT equ $3000
|
|
OUTPUT equ $0400
|
|
|
|
org $1000
|
|
|
|
ldy #END-AFTER
|
|
copy lda BEFORE,y
|
|
sta AFTER,y
|
|
dey
|
|
bmi done
|
|
bpl copy
|
|
|
|
dfb $00
|
|
stuff asc 'hello!'
|
|
|
|
done jmp AFTER
|
|
|
|
BEFORE
|
|
org $2000
|
|
AFTER
|
|
|
|
lda INPUT ;expecting 0-3
|
|
cmp #4
|
|
blt :valid
|
|
lda #4 ;error message
|
|
:valid asl A
|
|
tax
|
|
lda stringtab,x ;set load to address
|
|
sta _load+1
|
|
lda stringtab+1,x
|
|
sta _load+2
|
|
|
|
ldy #12 ;fixed-width strings
|
|
_load lda $0000,y ;self-modifying code
|
|
ora #$80
|
|
sta OUTPUT,y
|
|
dey
|
|
bpl _load
|
|
|
|
rts
|
|
|
|
stringtab
|
|
dw string0
|
|
dw string1
|
|
dw string2
|
|
dw string3
|
|
dw stringX
|
|
dfb $00
|
|
|
|
string0 asc 'string zero '
|
|
string1 asc 'string one '
|
|
string2 asc 'string two '
|
|
string3 asc 'string three '
|
|
stringX asc 'invalid index'
|
|
|
|
END
|
|
|