mirror of
https://github.com/bobbimanners/Applecorn.git
synced 2024-06-22 20:29:34 +00:00
184 lines
4.7 KiB
ArmAsm
184 lines
4.7 KiB
ArmAsm
*********************************************************
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* Kernel / Misc
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*********************************************************
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* KERNEL/CHARIO.S
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*****************
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* Character read and write
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*
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* OSWRCH handler
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* All registers preserved
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WRCHHND PHA
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PHX
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PHY
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* TODO Check any output redirections
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* TODO Check any spool output
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JSR OUTCHAR
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* TODO Check any printer output
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PLY
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PLX
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PLA
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RTS
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* OSRDCH handler
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* All registers preserved except A, Carry
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* Read a character from the keyboard
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RDCHHND PHX
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PHY
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JSR GETCHRC
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STA OLDCHAR
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:L1 LDA CURS+1 ; Skip unless CURS=$8000
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CMP #$80
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BNE :S1
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LDA CURS
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BNE :S1
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STZ CURS
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STZ CURS+1
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LDA CSTATE
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ROR
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BCS :S2
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LDA #'_'
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BRA :S3
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:S2 LDA OLDCHAR
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:S3 JSR PRCHRC
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INC CSTATE
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:S1 INC CURS
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BNE :S4
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INC CURS+1
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:S4 LDA $C000 ; Keyboard data/strobe
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BPL :L1
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LDA OLDCHAR ; Erase cursor
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JSR PRCHRC
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LDA $C000
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AND #$7F
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STA $C010 ; Clear strobe
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PLY
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PLX
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CMP #$1B ; Escape pressed?
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BNE :S5
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SEC ; Return CS
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ROR ESCFLAG
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SEC
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RTS
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:S5 CLC
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RTS
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CURS DW $0000 ; Counter
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CSTATE DB $00 ; Cursor on or off
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OLDCHAR DB $00 ; Char under cursor
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BYTE81 JSR GETKEY ; $81 = Read key with time lim
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RTS
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* Performs OSBYTE $81 INKEY$ function
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* X,Y has time limit
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* On exit, CC, Y=$00, X=key - key pressed
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* CS, Y=$FF - timeout
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* CS, Y=$1B - escape
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GETKEY TYA
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BMI NEGKEY ; Negative INKEY
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:L1 CPX #$00
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BEQ :S1
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LDA $C000 ; Keyb data/strobe
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AND #$80
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BNE :GOTKEY
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JSR DELAY ; 1/100 sec
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DEX
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BRA :L1
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:S1 CPY #$00
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BEQ :S2
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DEY
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LDX #$FF
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BRA :L1
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:S2 LDA $C000 ; Keyb data/strobe
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AND #$80
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BNE :GOTKEY
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LDY #$FF ; No key, time expired
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SEC
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RTS
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:GOTKEY LDA $C000 ; Fetch char
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AND #$7F
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STA $C010 ; Clear strobe
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CMP #27 ; Escape
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BEQ :ESC
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TAX
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LDY #$00
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CLC
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RTS
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:ESC ROR ESCFLAG
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LDY #27 ; Escape
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SEC
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RTS
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NEGKEY LDX #$00 ; Unimplemented
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LDY #$00
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RTS
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* KERNEL/KEYBOARD.S
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*******************
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KBDREAD
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KEYPRESS LDA $C000
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TAY
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CMP #$80
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BCC KEYNONE ; No key pressed
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AND #$7F
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STA $C010 ; Ack. keypress
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BIT $C061
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BMI KEYLALT ; Left Apple pressed
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BIT $C062
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BMI KEYRALT ; Right Apple pressed
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CMP #$09
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BEQ KEYTAB
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CMP #$08
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BCC KEYOK ; <$08 not cursor key
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CMP #$0C
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BCC KEYCURSR
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CMP #$15
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BEQ KEYCUR15
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KEYOK SEC ; SEC=Ok
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KEYNONE RTS
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KEYTAB LDA #$C9
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; If cursors active, COPY
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; else TAB
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SEC
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RTS
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KEYRALT ; Right Apple key pressed
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KEYLALT CMP #$40 ; Left Apple key pressed
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BCS KEYCTRL
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CMP #$30
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BCC KEYOK ; <'0'
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CMP #$3A
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BCS KEYOK ; >'9'
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KEYFUNC AND #$0F ; Convert Apple-Num to function key
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ORA #$80
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BIT $C062
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BPL KEYFUNOK ; Left+Digit -> $8x
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ORA #$90 ; Right+Digit -> $9x
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BIT $C061
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BPL KEYFUNOK
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EOR #$30 ; Left+Right+Digit -> $Ax
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KEYFUNOK SEC
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RTS
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KEYCTRL AND #$1F ; Apple-Letter -> Ctrl-Letter
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RTS
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KEYCUR15
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* BIT $C062
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* BPL KEYCUR16 ; Right Apple not pressed
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* LDA #$C9 ; Solid+Right -> COPY?
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* SEC
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* RTS
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KEYCUR16 LDA #$09 ; Convert RGT to $09
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KEYCURSR AND #$03
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ORA #$CC ; Cursor keys $CC-$CF
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SEC ; SEC=Ok
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RTS
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