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https://github.com/cc65/cc65.git
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0f4cb443b4
Certain scenarios (e.g. not running any Applesoft program at all since booting DOS 3.3) can make DOS 3.3 consider cc65 device input (e.g. getchar()) that reads a CR interpreting the command in the keyboard buffer. Setting the hibyte of the Applesoft currently executed line number to some value <> $FF (beside setting the input prompt to some value <> ']') makes DOS 3.3 understand that we're not in intermediate mode and that therefore I/O not preceded with ctrl-d mustn't be fiddled with (see DOS 3.3 routine at $A65E).
88 lines
3.2 KiB
PHP
88 lines
3.2 KiB
PHP
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;-----------------------------------------------------------------------------
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; Zero page
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WNDLFT := $20 ; Text window left
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WNDWDTH := $21 ; Text window width
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WNDTOP := $22 ; Text window top
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WNDBTM := $23 ; Text window bottom+1
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CH := $24 ; Cursor horizontal position
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CV := $25 ; Cursor vertical position
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BASL := $28 ; Text base address low
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BASH := $29 ; Text base address high
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INVFLG := $32 ; Normal/inverse(/flash)
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PROMPT := $33 ; Used by GETLN
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RNDL := $4E ; Random counter low
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RNDH := $4F ; Random counter high
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HIMEM := $73 ; Highest available memory address+1
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CURLIN := $75 ; Current line number being executed
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;-----------------------------------------------------------------------------
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; Vectors
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DOSWARM := $03D0 ; DOS warmstart vector
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BRKVec := $03F0 ; Break vector
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SOFTEV := $03F2 ; Vector for warm start
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PWREDUP := $03F4 ; This must be = EOR #$A5 of SOFTEV+1
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;-----------------------------------------------------------------------------
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; Hardware
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; Keyboard input
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KBD := $C000 ; Read keyboard
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KBDSTRB := $C010 ; Clear keyboard strobe
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; 80 column video
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CLR80COL:= $C000 ; Disable 80 column store
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SET80COL:= $C001 ; Enable 80 column store
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RD80COL := $C018 ; >127 if 80 column store enabled
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RD80VID := $C01F ; >127 if 80 column video enabled
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; Character set
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CLRALTCHAR := $C00E ; Normal Apple II char set
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SETALTCHAR := $C00F ; Norm/inv LC, no flash
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ALTCHARSET := $C01E ; >127 if alt charset switched in
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; Language card
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RDLCBNK2:= $C011 ; >127 if LC bank 2 in use
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RDLCRAM := $C012 ; >127 if LC is read enabled
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ROMIN := $C081 ; Swap in D000-FFFF ROM
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LCBANK2 := $C083 ; Swap in LC bank 2
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LCBANK1 := $C08B ; Swap in LC bank 1
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; Vertical blanking
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RDVBLBAR := $C019 ; >127 if not vertical blanking
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RDVBLMSK := $C041 ; >127 if VBL interrupts enabled
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DISVBL := $C05A ; Disable VBL interrupts
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ENVBL := $C05B ; Enable VBL interrupts
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; Video mode
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TXTCLR := $C050 ; Display graphics
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TXTSET := $C051 ; Display text
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MIXCLR := $C052 ; Disable 4 lines of text
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MIXSET := $C053 ; Enable 4 lines of text
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LOWSCR := $C054 ; Page 1
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HISCR := $C055 ; Page 2
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LORES := $C056 ; Lores graphics
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HIRES := $C057 ; Hires graphics
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DHIRESON := $C05E ; Enable double-width graphics
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DHIRESOFF := $C05F ; Disable double-width graphics
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; Game controller
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TAPEIN := $C060 ; Read casette input / Switch input 3
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BUTN0 := $C061 ; Switch input 0 / Open-Apple key
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BUTN1 := $C062 ; Switch input 1 / Closed-Apple key
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BUTN2 := $C063 ; Switch input 2 / Shift key
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PADDL0 := $C064 ; Analog input 0
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PADDL1 := $C065 ; Analog input 1
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PADDL2 := $C066 ; Analog input 2
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PADDL3 := $C067 ; Analog input 3
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PTRIG := $C070 ; Analog input reset
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; Input/Output Unit
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IOUDISON := $C07E ; Disable IOU
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IOUDISOFF := $C07F ; Enable IOU
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; Control Your Apple
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CYAREG := $C036 ; Bits 0-3=disk detect 4=shadow all banks 7=fast
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