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162 lines
3.8 KiB
162 lines
3.8 KiB
;======================================================================
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; NABU KEYBOARD DRIVER
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;
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; CREATED BY: LES BIRD
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;
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;======================================================================
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;
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; KBPORT EQU $90
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;
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; POLL FOR INPUT
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; KBLOOP:
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; IN A,(KBPORT+1)
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; BIT 1,A
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; JR Z,KBLOOP
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; IN A,(KBPORT)
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;
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; INIT:
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; XOR A
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; CALL SUB12
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; CALL SUB12
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; CALL SUB12
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; CALL SUB12
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; CALL SUB12
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; LD A,40H
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; CALL SUB12
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; LD A,4EH
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; CALL SUB12
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; LD A,04H
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; CALL SUB12
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;
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NABUKB_DAT .EQU $90
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;
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NABUKB_INIT:
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CALL NEWLINE
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PRTS("NABUKB: IO=0x$")
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LD A,NABUKB_DAT
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CALL PRTHEXBYTE
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;
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XOR A
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CALL NABUKB_PUT
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CALL NABUKB_PUT
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CALL NABUKB_PUT
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CALL NABUKB_PUT
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CALL NABUKB_PUT
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LD A,$40 ; RESET 8251
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CALL NABUKB_PUT
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LD A,$4E ; 1 STOP BIT, 8 BITS, 64X CLK
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CALL NABUKB_PUT
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LD A,$04 ; ENABLE RECV
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CALL NABUKB_PUT
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;
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XOR A
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RET
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;
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NABUKB_STAT:
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LD A,(NABUKB_KSTAT) ; GET KEY WAITING STATUS
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OR A ; SET FLAGS
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RET NZ ; KEY WAITING, ALL SET
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IN A,(NABUKB_DAT+1) ; GET BKD STATUS
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AND $02 ; CHECK DATA RDY BIT
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JR Z,NABUKB_STAT1 ; BAIL OUT IF NOT
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IN A,(NABUKB_DAT) ; GET THE KEY
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BIT 7,A ; HIGH BIT IS SPECIAL CHAR
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CALL NZ,NABUKB_XLAT ; IF SO, TRANSLATE IT
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JR C,NABUKB_STAT1 ; CF INDICATES INVALID
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LD (NABUKB_KEY),A ; BUFFER IT
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LD A,1 ; KEY WAITING STATUS
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LD (NABUKB_KSTAT),A ; SAVE IT
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OR A ; SET FLAGS
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RET
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;
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NABUKB_STAT1:
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XOR A ; SIGNAL NO CHAR READY
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JP CIO_IDLE ; RETURN VIA IDLE PROCESSOR
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;
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NABUKB_XLAT:
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; NABU KEYBOARD USES $E0-$FF FOR SPECIAL KEYS
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; HERE WE TRANSLATE TO ROMWBW SPECIAL KEYS AS BEST WE CAN
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; CF IS SET ON RETURN IF KEY IS INVALID (NO TRANSLATION)
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SUB $E0 ; ZERO OFFSET
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RET C ; ABORT IF < $E0, CF SET!
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LD HL,NABUKB_XTBL ; POINT TO XLAT TABLE
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CALL ADDHLA ; OFFSET BY SPECIAL KEY VAL
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LD A,(HL) ; GET TRANSLATED VALUE
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OR A ; CHECK FOR N/A (0)
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RET NZ ; XLAT OK, RET W/ CF CLEAR
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SCF ; SIGNAL INVALID
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RET ; DONE
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;
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NABUKB_XLAT1:
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SCF ; SIGNAL INVALID
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RET ; AND DONE
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;
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NABUKB_FLUSH:
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XOR A
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RET
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;
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NABUKB_READ:
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CALL NABUKB_STAT ; CHECK FOR KEY READY
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JR Z,NABUKB_READ ; LOOP TIL ONE IS READY
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LD A,(NABUKB_KEY) ; GET THE BUFFERED KEY
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LD E,A ; PUT IN E FOR RETURN
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XOR A ; ZERO TO ACCUM
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LD C,A ; NO SCANCODE
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LD D,A ; NO KEYSTATE
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LD (NABUKB_KSTAT),A ; CLEAR KEY WAITING STATUS
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RET ; AND RETURN
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;
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NABUKB_PUT:
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OUT (NABUKB_DAT+1),A
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NOP
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NOP
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NOP
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NOP
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NOP
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RET
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;
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;
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;
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NABUKB_KSTAT .DB 0 ; KEY STATUS
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NABUKB_KEY .DB 0 ; KEY BUFFER
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;
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; THIS TABLE TRANSLATES THE NABU KEYBOARD SPECIAL CHARS INTO
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; ANALOGOUS ROMWBW STANDARD SPECIAL CHARACTERS. THE TABLE STARTS WITH
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; NABU KEY CODE $E0 AND HANDLES $20 POSSIBLE VALUES ($E0-$FF)
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; THE SPECIAL KEYS SEND A SPECIFIC KEYCODE TO INDICATE DOWN (KEY
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; PRESSED) AND UP (KEY RELEASED). WE WILL ARBITRARILY CHOOSE TO
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; RESPOND TO KEY RELEASED.
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;
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NABUKB_XTBL:
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.DB $00 ; $E0, RIGHT ARROW (DN)
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.DB $00 ; $E1, LEFT ARROW (DN)
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.DB $00 ; $E2, UP ARROW (DN)
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.DB $00 ; $E3, DOWN ARROW (DN)
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.DB $00 ; $E4, PAGE RIGHT (DN)
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.DB $00 ; $E5, PAGE LEFT (DN)
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.DB $00 ; $E6, NO (DN)
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.DB $00 ; $E7, YES (DN)
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.DB $00 ; $E8, SYM (DN)
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.DB $00 ; $E9, PAUSE (DN)
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.DB $00 ; $EA, TV/NABU (DN)
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.DB $00 ; $EB, N/A
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.DB $00 ; $EC, N/A
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.DB $00 ; $ED, N/A
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.DB $00 ; $EE, N/A
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.DB $00 ; $EF, N/A
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.DB $F9 ; $F0, RIGHT ARROW (UP) -> RIGHT ARROW
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.DB $F8 ; $F1, LEFT ARROW (UP) -> LEFT ARROW
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.DB $F6 ; $F2, UP ARROW (UP) -> UP ARROW
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.DB $F7 ; $F3, DOWN ARROW (UP) -> DOWN ARROW
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.DB $F5 ; $F4, PAGE RIGHT (UP) -> PAGE DOWN
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.DB $F4 ; $F5, PAGE LEFT (UP) -> PAGE UP
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.DB $F3 ; $F6, NO (UP) -> END
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.DB $F2 ; $F7, YES (UP) -> HOME
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.DB $EC ; $F8, SYM (UP) -> SYSRQ
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.DB $EE ; $F9, PAUSE (UP) -> PAUSE
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.DB $EF ; $FA, TV/NABU (UP) -> APP
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.DB $00 ; $FB, N/A
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.DB $00 ; $FC, N/A
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.DB $00 ; $FD, N/A
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.DB $00 ; $FE, N/A
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.DB $00 ; $FF, N/A
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