816666615b
Add a machinetype identifier to help us quickly identify Apple //e (bit 7) and //e enhanced (bit 6). Use it in conio functions for 80-columns code instead of relying entirely on the __APPLE2ENH__ target. Move videomode() to the apple2 target, and have it return an error if 80-columns hardware is not available - this is a lie for now, it is considered available on //e enhanced, which may not be true, and not available on //e, which may also be not true. An ulterior patch will make that check correctly. Adapt the box/line drawing characters so that one can use MouseText on the apple2 target if it is available, by defining DYN_DRAW_BOX. No change by default: MouseText is considered available on apple2enh and not available on apple2.
43 lines
985 B
ArmAsm
43 lines
985 B
ArmAsm
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; 2020-07-12, Oliver Schmidt
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; char cpeekc (void);
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.ifndef __APPLE2ENH__
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.import machinetype
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.endif
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.export _cpeekc
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.include "apple2.inc"
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_cpeekc:
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ldy CH
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sec ; Assume main memory
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.ifndef __APPLE2ENH__
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bit machinetype
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bpl peek
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.endif
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bit RD80VID ; In 80 column mode?
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bpl peek ; No, just go ahead
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lda OURCH
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lsr ; Div by 2
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tay
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bcs peek ; Odd cols are in main memory
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php
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sei ; No valid MSLOT et al. in aux memory
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bit HISCR ; Assume SET80COL
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peek: lda (BASL),Y ; Get character
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bcs :+ ; In main memory
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bit LOWSCR
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plp
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: eor #$80 ; Invert high bit
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ldx #>$0000
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rts
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