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Implemented OSBYTE76 for SHIFT/CTRL test

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See comments on how to call to control screen scrolling.
Took some careful planning to convert the inline code in the keyboard driver into a callable routine.
I'll update later to remove the duplicate code in the keyboard driver.
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jgharston 2023-01-03 07:36:58 +00:00 committed by GitHub
parent 915cac934f
commit dc2dee0de4
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1 changed files with 67 additions and 4 deletions
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71
auxmem.chario.s
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@ -38,6 +38,8 @@
* 26-Dec-2022 Integrated ADB extended keyboard keys.
* 27-Dec-2022 Bobbi's keyboard uses $60+n extended keys.
* 30-Dec-2022 Optimised *KEY, US KBD Alt-Ctrl-2, Alt-Ctrl-6 -> f2/f6.
* 03-Jan-2033 Wrote BYTE76 to return CTRL/SHIFT state for text pausing.
* TO DO: Update KBDREAD to use BYTE76.
* Hardware locations
@ -122,7 +124,7 @@ KBDINIT LDX #DEFBYTEEND-DEFBYTE-1
LDA #$80 ; Keypad keys are function keys
STA FXKEYPADBASE
JSR SOFTKEYCHK ; Clear soft keys
LDX #$C3 ; Default KBD=RISCOS, MODE=3
LDX #$C3 ; Default KBD=RISC OS, MODE=3
STX FX254VAR ; b7-b4=default KBD map, b3-b0=default MODE
* LDX #$03 ; Default MODE=3 (map already <$C0 by startup)
BIT SETV ; Set V
@ -730,7 +732,7 @@ KBDTEST LDA KBDDATA ; VS here to test for keypress
BVS KBDDONE2 ; VS=test for keypress
STA KBDACK ; Ack. keypress
KBDREAD2 TAX ; X=raw keypress
*
* NB: BYTE76A corrupts X
* Set FXKBDSTATE to %x0CS0000 from Alt or Shift keys
LDA KBDAPPRGT ; Right Apple/Alt pressed
ASL A
@ -877,6 +879,67 @@ BYTE7C CLC ; &7C = clear escape condition
BYTE7D ROR ESCFLAG ; $7D = set escape condition
BYTE7DOK RTS
BYTE76 LDX #80 ; *TEMP* ; Update LEDs and return X=SHIFT
RTS ; Not possible with Apple
* Update KBDSTATE and return state of SHIFT and CTRL keys
* Returns A=X= =%SxxxxEAx
* Flags =C=Ctrl, M=Shift, V=Extended key
* OSKBD1 =%00CS0000
* FXKBDSTATE=%CSxxxxEA C=Ctrl, S=Shift, E=Extended, A=Apple
BYTE76 JSR ESCPOLL
CLC
BMI BYTE76X ; Escape pending, return M=Shift, C=None
BYTE76A LDA KBDAPPRGT ; Right Apple/Alt pressed
ASL A
LDA KBDAPPLFT ; Left Apple/Alt pressed
ROR A ; b7=Right, b6=Left
AND #$C0
PHP ; Save EQ=no ALTs pressed
BEQ BYTE76C
ADC #$C1 ; Convert into fkey modifer, b0=1
BYTE76C STA OSKBD1
BIT VDUBANK
BPL BYTE76E ; Not IIgs
LDA KBDMOD ; Get extended KBD state
ROR A
ROR A
ROR A ; b7=Ctrl, b6=Shift, b1=Extended
AND #$C2
PLP
BEQ BYTE76D
AND #$02 ; ALTs pressed, just keep Extend
BYTE76D ORA OSKBD1
STA OSKBD1 ; Update with Ctrl/Shift/Extend
PHP ; Balance stack
BYTE76E PLP ; Drop flags, NE=either ALT pressed
LSR OSKBD1 ; Adjust for soft key modifier
LSR OSKBD1 ; b5=Ctrl, b4=Shift, Cy=Extend
CLV ; CLV=Not Extend
BCC BYTE76F
BIT SETV ; SEV=Extend
BYTE76F LSR A ; Test ALT bit in bit 0
BCC BYTE76G
ORA #$20
BYTE76G ROL A ; Put bit 0 back
* STA $028F ; FXKBDSTATE *TEMP*
ASL A ; C=Ctrl, M=Shift
TAX ; X.b7=Shift
BYTE76X RTS
* Call BYTE76 to get state of SHIFT/CTRL to pause/restore scrolling
* Left and Right Apple keys simulate SHIFT/CTRL when no KBDMOD register
* Returns: M =SHIFT or one APPLE key pressed
* C =CTRL pressed
* M+C =SHIFT+CTRL pressed or both APPLE keys pressed
* Escape will abort and return MI+CC to simulate SHIFT to continue
*
* Scrolling can pause with:
* LOOP:
* JSR BYTE76
* BPL EXIT ; SHIFT not pressed
* BCS LOOP ; SHIFT+CTRL pressed
* EXIT:
*
* Paged mode can be released with:
* LOOP:
* JSR BYTE76
* BPL LOOP ; SHIFT not pressed
*