54 lines
2.6 KiB
Plaintext
54 lines
2.6 KiB
Plaintext
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/----------------------------------------------------------------------------\
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Apple //e Soft Switch, Status, and other I/O locations
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\----------------------------------------------------------------------------/
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MEMORY MANAGEMENT SOFT SWITCHES
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$C000 W 80STOREOFF Allow page2 to switch video page1 page2
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$C001 W 80STOREON Allow page2 to switch main & aux video memory
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$C002 W RAMRDOFF Read enable main memory from $0200-$BFFF
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$C003 W RAMDRON Read enable aux memory from $0200-$BFFF
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$C004 W RAMWRTOFF Write enable main memory from $0200-$BFFF
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$C005 W RAMWRTON Write enable aux memory from $0200-$BFFF
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$C006 W INTCXROMOFF Enable slot ROM from $C100-$CFFF
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$C007 W INTCXROMON Enable main ROM from $C100-$CFFF
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$C008 W ALZTPOFF Enable main memory from $0000-$01FF & avl BSR
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$C009 W ALTZPON Enable aux memory from $0000-$01FF & avl BSR
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$C00A W SLOTC3ROMOFF Enable main ROM from $C300-$C3FF
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$C00B W SLOTC3ROMON Enable slot ROM from $C300-$C3FF
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VIDEO SOFT SWITCHES
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$C00C W 80COLOFF Turn off 80 column display
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$C00D W 80COLON Turn on 80 column display
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$C00E W ALTCHARSETOFF Turn off alternate characters
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$C00F W ALTCHARSETON Turn on alternate characters
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$C050 R/W TEXTOFF Select graphics mode
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$C051 R/W TEXTON Select text mode
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$C052 R/W MIXEDOFF Use full screen for graphics
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$C053 R/W MIXEDON Use graphics with 4 lines of text
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$C054 R/W PAGE2OFF Select panel display (or main video memory)
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$C055 R/W PAGE2ON Select page2 display (or aux video memory)
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$C056 R/W HIRESOFF Select low resolution graphics
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$C057 R/W HIRESON Select high resolution graphics
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SOFT SWITCH STATUS FLAGS
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$C010 R7 AKD 1=key pressed 0=keys free (clears strobe)
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$C011 R7 BSRBANK2 1=bank2 available 0=bank1 available
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$C012 R7 BSRREADRAM 1=BSR active for read 0=$D000-$FFFF active
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$C013 R7 RAMRD 0=main $0200-$BFFF active reads 1=aux active
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$C014 R7 RAMWRT 0=main $0200-$BFFF active writes 1=aux writes
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$C015 R7 INTCXROM 1=main $C100-$CFFF ROM active 0=slot active
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$C016 R7 ALTZP 1=aux $0000-$1FF+auxBSR 0=main available
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$C017 R7 SLOTC3ROM 1=slot $C3 ROM active 0=main $C3 ROM active
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$C018 R7 80STORE 1=page2 switches main/aux 0=page2 video
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$C019 R7 VERTBLANK 1=vertical retrace on 0=vertical retrace off
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$C01A R7 TEXT 1=text mode is active 0=graphics mode active
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$C01B R7 MIXED 1=mixed graphics & text 0=full screen
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$C01C R7 PAGE2 1=video page2 selected or aux
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$C01D R7 HIRES 1=high resolution graphics 0=low resolution
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$C01E R7 ALTCHARSET 1=alt character set on 0=alt char set off
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$C01F R7 80COL 1=80 col display on 0=80 col display off
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\============================================================================/
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