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cc65/libsrc/pce/_scrsize.s

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;
; Screen size variables
;
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.export screensize
.export xsize, ysize
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.include "pce.inc"
screensize:
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ldx xsize
ldy ysize
rts
; FIXME: changing the video mode allows for different screen sizes
.rodata
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xsize: .byte charsperline
ysize: .byte screenrows