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About all CONIO functions offering a <...>xy variant call popa _gotoxy By providing an internal gotoxy variant that starts with a popa all those CONIO function can be shortened by 3 bytes. As soon as program calls more than one CONIO function this means an overall code size reduction.
37 lines
1.1 KiB
ArmAsm
37 lines
1.1 KiB
ArmAsm
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; Ullrich von Bassewitz, 08.08.1998
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;
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; void __fastcall__ chlinexy (unsigned char x, unsigned char y, unsigned char length);
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; void __fastcall__ chline (unsigned char length);
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;
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.export _chlinexy, _chline, chlinedirect
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.import gotoxy, cputdirect
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.include "zeropage.inc"
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.include "apple2.inc"
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_chlinexy:
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pha ; Save the length
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jsr gotoxy ; Call this one, will pop params
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pla ; Restore the length and run into _chline
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_chline:
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.ifdef __APPLE2ENH__
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ldx #'S' ; MouseText character
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ldy INVFLG
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cpy #$FF ; Normal character display mode?
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beq chlinedirect
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.endif
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ldx #'-' | $80 ; Horizontal line, screen code
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chlinedirect:
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cmp #$00 ; Is the length zero?
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beq done ; Jump if done
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sta tmp1
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: txa ; Screen code
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jsr cputdirect ; Direct output
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dec tmp1
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bne :-
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done: rts
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