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cc65/asminc/apple2.inc

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Moved into asminc, so it will be available in the distribution. git-svn-id: svn://svn.cc65.org/cc65/trunk@4228 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-25 06:21:14 +00:00
;-----------------------------------------------------------------------------
Added waitvsync() for the Enhanced Apple //e. The implementation is a bit tricky as it requires to take different code paths for the //e, the //c and the IIgs. Additionally the //c only provides a VBL IRQ flag supposed to be used by an IRQ handler to determine what triggered the IRQ. However, masking IRQs on the CPU, activating the VBL IRQ, clearing any pending VBL IRQs and then polling for the IRQ flag does the trick.
2020-06-18 19:44:42 +00:00
; Zero page
Moved into asminc, so it will be available in the distribution. git-svn-id: svn://svn.cc65.org/cc65/trunk@4228 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-25 06:21:14 +00:00
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
WNDLFT := $20 ; Text window left
WNDWDTH := $21 ; Text window width
WNDTOP := $22 ; Text window top
WNDBTM := $23 ; Text window bottom+1
CH := $24 ; Cursor horizontal position
CV := $25 ; Cursor vertical position
BASL := $28 ; Text base address low
BASH := $29 ; Text base address high
INVFLG := $32 ; Normal/inverse(/flash)
PROMPT := $33 ; Used by GETLN
RNDL := $4E ; Random counter low
RNDH := $4F ; Random counter high
HIMEM := $73 ; Highest available memory address+1
Improved device I/O under DOS 3.3 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).
2020-12-19 18:54:12 +00:00
CURLIN := $75 ; Current line number being executed
Moved into asminc, so it will be available in the distribution. git-svn-id: svn://svn.cc65.org/cc65/trunk@4228 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-25 06:21:14 +00:00
;-----------------------------------------------------------------------------
; Vectors
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
DOSWARM := $03D0 ; DOS warmstart vector
BRKVec := $03F0 ; Break vector
SOFTEV := $03F2 ; Vector for warm start
PWREDUP := $03F4 ; This must be = EOR #$A5 of SOFTEV+1
Moved into asminc, so it will be available in the distribution. git-svn-id: svn://svn.cc65.org/cc65/trunk@4228 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-25 06:21:14 +00:00
;-----------------------------------------------------------------------------
; Hardware
; Keyboard input
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
KBD := $C000 ; Read keyboard
KBDSTRB := $C010 ; Clear keyboard strobe
Moved into asminc, so it will be available in the distribution. git-svn-id: svn://svn.cc65.org/cc65/trunk@4228 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-25 06:21:14 +00:00
Added waitvsync() for the Enhanced Apple //e. The implementation is a bit tricky as it requires to take different code paths for the //e, the //c and the IIgs. Additionally the //c only provides a VBL IRQ flag supposed to be used by an IRQ handler to determine what triggered the IRQ. However, masking IRQs on the CPU, activating the VBL IRQ, clearing any pending VBL IRQs and then polling for the IRQ flag does the trick.
2020-06-18 19:44:42 +00:00
; 80 column video
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
CLR80COL:= $C000 ; Disable 80 column store
SET80COL:= $C001 ; Enable 80 column store
RD80COL := $C018 ; >127 if 80 column store enabled
Moved into asminc, so it will be available in the distribution. git-svn-id: svn://svn.cc65.org/cc65/trunk@4228 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-25 06:21:14 +00:00
RD80VID := $C01F ; >127 if 80 column video enabled
Added waitvsync() for the Enhanced Apple //e. The implementation is a bit tricky as it requires to take different code paths for the //e, the //c and the IIgs. Additionally the //c only provides a VBL IRQ flag supposed to be used by an IRQ handler to determine what triggered the IRQ. However, masking IRQs on the CPU, activating the VBL IRQ, clearing any pending VBL IRQs and then polling for the IRQ flag does the trick.
2020-06-18 19:44:42 +00:00
; Character set
Moved into asminc, so it will be available in the distribution. git-svn-id: svn://svn.cc65.org/cc65/trunk@4228 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-25 06:21:14 +00:00
CLRALTCHAR := $C00E ; Normal Apple II char set
SETALTCHAR := $C00F ; Norm/inv LC, no flash
ALTCHARSET := $C01E ; >127 if alt charset switched in
Added waitvsync() for the Enhanced Apple //e. The implementation is a bit tricky as it requires to take different code paths for the //e, the //c and the IIgs. Additionally the //c only provides a VBL IRQ flag supposed to be used by an IRQ handler to determine what triggered the IRQ. However, masking IRQs on the CPU, activating the VBL IRQ, clearing any pending VBL IRQs and then polling for the IRQ flag does the trick.
2020-06-18 19:44:42 +00:00
; Language card
Removed (pretty inconsistently used) tab chars from source code base.
2013-05-09 11:56:54 +00:00
RDLCBNK2:= $C011 ; >127 if LC bank 2 in use
RDLCRAM := $C012 ; >127 if LC is read enabled
ROMIN := $C081 ; Swap in D000-FFFF ROM
LCBANK2 := $C083 ; Swap in LC bank 2
LCBANK1 := $C08B ; Swap in LC bank 1
Moved into asminc, so it will be available in the distribution. git-svn-id: svn://svn.cc65.org/cc65/trunk@4228 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-25 06:21:14 +00:00
Added waitvsync() for the Enhanced Apple //e. The implementation is a bit tricky as it requires to take different code paths for the //e, the //c and the IIgs. Additionally the //c only provides a VBL IRQ flag supposed to be used by an IRQ handler to determine what triggered the IRQ. However, masking IRQs on the CPU, activating the VBL IRQ, clearing any pending VBL IRQs and then polling for the IRQ flag does the trick.
2020-06-18 19:44:42 +00:00
; Vertical blanking
RDVBLBAR := $C019 ; >127 if not vertical blanking
RDVBLMSK := $C041 ; >127 if VBL interrupts enabled
DISVBL := $C05A ; Disable VBL interrupts
ENVBL := $C05B ; Enable VBL interrupts
; Video mode
TXTCLR := $C050 ; Display graphics
TXTSET := $C051 ; Display text
MIXCLR := $C052 ; Disable 4 lines of text
MIXSET := $C053 ; Enable 4 lines of text
LOWSCR := $C054 ; Page 1
HISCR := $C055 ; Page 2
LORES := $C056 ; Lores graphics
HIRES := $C057 ; Hires graphics
DHIRESON := $C05E ; Enable double-width graphics
DHIRESOFF := $C05F ; Disable double-width graphics
Moved into asminc, so it will be available in the distribution. git-svn-id: svn://svn.cc65.org/cc65/trunk@4228 b7a2c559-68d2-44c3-8de9-860c34a00d81
2009-09-25 06:21:14 +00:00
; Game controller
Replaced call to paddle read ROM routine with custom code. As described e.g. in the Apple IIe Technote #6: 'The Apple II Paddle Circuits' it doesn't work to call PREAD several times in immediate succession. However, so far the Apple II joystick driver did just that in order to read the two joystick axis. Therefore the driver now uses a custom routine that reads both paddles _at_the_same_time_. The code doing so requires nearly twice the cycles meaning that the overall time for a joy_read() stays roughly the same. However, twice the cycles in the read loop means half the resolution. But for the cc65 joystick driver use case that doesn't hurt at all as the driver is supposed to only detect neutral vs. left/right and up/down. CPU accelerators are supposed to detect access to $C070 and slow down for some time automatically. However, the IIgs rather comes with a modified ROM routine. Therefore it is necessary to manually slow down the IIgs when replacing the ROM routine.
2020-06-06 13:14:56 +00:00
TAPEIN := $C060 ; Read casette input / Switch input 3
BUTN0 := $C061 ; Switch input 0 / Open-Apple key
BUTN1 := $C062 ; Switch input 1 / Closed-Apple key
BUTN2 := $C063 ; Switch input 2 / Shift key
PADDL0 := $C064 ; Analog input 0
PADDL1 := $C065 ; Analog input 1
PADDL2 := $C066 ; Analog input 2
PADDL3 := $C067 ; Analog input 3
PTRIG := $C070 ; Analog input reset
Disable potentially enabled double-width graphics.
2020-05-04 20:22:32 +00:00
Replaced call to paddle read ROM routine with custom code. As described e.g. in the Apple IIe Technote #6: 'The Apple II Paddle Circuits' it doesn't work to call PREAD several times in immediate succession. However, so far the Apple II joystick driver did just that in order to read the two joystick axis. Therefore the driver now uses a custom routine that reads both paddles _at_the_same_time_. The code doing so requires nearly twice the cycles meaning that the overall time for a joy_read() stays roughly the same. However, twice the cycles in the read loop means half the resolution. But for the cc65 joystick driver use case that doesn't hurt at all as the driver is supposed to only detect neutral vs. left/right and up/down. CPU accelerators are supposed to detect access to $C070 and slow down for some time automatically. However, the IIgs rather comes with a modified ROM routine. Therefore it is necessary to manually slow down the IIgs when replacing the ROM routine.
2020-06-06 13:14:56 +00:00
; Input/Output Unit
Added waitvsync() for the Enhanced Apple //e. The implementation is a bit tricky as it requires to take different code paths for the //e, the //c and the IIgs. Additionally the //c only provides a VBL IRQ flag supposed to be used by an IRQ handler to determine what triggered the IRQ. However, masking IRQs on the CPU, activating the VBL IRQ, clearing any pending VBL IRQs and then polling for the IRQ flag does the trick.
2020-06-18 19:44:42 +00:00
IOUDISON := $C07E ; Disable IOU
IOUDISOFF := $C07F ; Enable IOU
Replaced call to paddle read ROM routine with custom code. As described e.g. in the Apple IIe Technote #6: 'The Apple II Paddle Circuits' it doesn't work to call PREAD several times in immediate succession. However, so far the Apple II joystick driver did just that in order to read the two joystick axis. Therefore the driver now uses a custom routine that reads both paddles _at_the_same_time_. The code doing so requires nearly twice the cycles meaning that the overall time for a joy_read() stays roughly the same. However, twice the cycles in the read loop means half the resolution. But for the cc65 joystick driver use case that doesn't hurt at all as the driver is supposed to only detect neutral vs. left/right and up/down. CPU accelerators are supposed to detect access to $C070 and slow down for some time automatically. However, the IIgs rather comes with a modified ROM routine. Therefore it is necessary to manually slow down the IIgs when replacing the ROM routine.
2020-06-06 13:14:56 +00:00
; Control Your Apple
CYAREG := $C036 ; Bits 0-3=disk detect 4=shadow all banks 7=fast
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