mirror of
https://github.com/bobbimanners/Applecorn.git
synced 2024-07-10 20:29:03 +00:00
200 lines
5.1 KiB
ArmAsm
200 lines
5.1 KiB
ArmAsm
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*********************************************************
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* Kernel / Misc
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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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* Performs OSBYTE $80 function
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* Read ADC channel or get buffer status
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OSBYTE80 CPX #$00 ; X=0 Last ADC channel
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BNE :S1
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LDX #$00 ; Fire button
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LDY #$00 ; ADC never converted
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RTS
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:S1 BMI :S2
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LDX #$00 ; X +ve, ADC value
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LDY #$00
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RTS
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:S2 CPX #$FF ; X $FF = keyboard buf
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BEQ :INPUT
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CPX #$FE ; X $FE = RS423 i/p buf
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BEQ :INPUT
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LDX #$FF ; Spaced remaining in o/p
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RTS
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:INPUT LDX #$00 ; Nothing in input buf
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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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***********************************************************
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* Helper functions
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***********************************************************
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* Beep
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BEEP PHA
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PHX
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LDX #$80
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:L1 LDA $C030
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JSR DELAY
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INX
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BNE :L1
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PLX
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PLA
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RTS
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* Delay approx 1/100 sec
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DELAY PHX
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PHY
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LDX #$00
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:L1 INX ; 2
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LDY #$00 ; 2
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:L2 INY ; 2
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CPY #$00 ; 2
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BNE :L2 ; 3 (taken)
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CPX #$02 ; 2
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BNE :L1 ; 3 (taken)
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PLY
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PLX
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RTS
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* Print string pointed to by X,Y to the screen
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OUTSTR TXA
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* Print string pointed to by A,Y to the screen
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PRSTR STA OSTEXT+0 ; String in A,Y
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STY OSTEXT+1
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:L1 LDA (OSTEXT) ; Ptr to string in OSTEXT
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BEQ :S1
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JSR OSASCI
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INC OSTEXT
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BNE :L1
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INC OSTEXT+1
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BRA :L1
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:S1 RTS
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* Print XY in hex
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OUT2HEX TYA
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JSR OUTHEX
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TAX ; Continue into OUTHEX
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* Print hex byte in A
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OUTHEX PHA
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LSR
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LSR
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LSR
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LSR
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AND #$0F
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JSR PRNIB
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PLA
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AND #$0F ; Continue into PRNIB
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* Print hex nibble in A
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PRNIB CMP #$0A
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BCC :S1
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CLC ; >= $0A
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ADC #'A'-$0A
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JSR OSWRCH
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RTS
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:S1 ADC #'0' ; < $0A
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JMP OSWRCH
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