lastkey = $10 actkey = $11 mask = $12 matrixlo = $13 matrixhi = $14 table = $0f00 *= $1000 lda #$37 sta $01 jsr $e544 sei lda #$35 sta $01 ldx #$00 lda #$00 - sta table,x dex bne - lda #$ff sta lastkey lda #$08 ;helper table to index into keyboard matrix sta table+%01111111 lda #$07 sta table+%10111111 lda #$06 sta table+%11011111 lda #$05 sta table+%11101111 lda #$04 sta table+%11110111 lda #$03 sta table+%11111011 lda #$02 sta table+%11111101 lda #$01 sta table+%11111110 lda #$08 ;left shift and another key sta table+%01111111 lda #$07 sta table+%00111111 lda #$06 sta table+%01011111 lda #$05 sta table+%01101111 lda #$04 sta table+%01110111 lda #$03 sta table+%01111011 lda #$02 sta table+%01111101 lda #$01 sta table+%01111110 lda #$08 ;right shift and another key sta table+%01101111 lda #$07 sta table+%10101111 lda #$06 sta table+%11001111 lda #$05 sta table+%11101111 lda #$04 sta table+%11100111 lda #$03 sta table+%11101011 lda #$02 sta table+%11101101 lda #$01 sta table+%11101110 ;endless dummy uu jsr keyscan lda actkey cmp #$ff ;$ff= no key pressed beq + cmp #$40 ;convert to screen codes bmi ok sec sbc #$40 ok sta $0400 + jmp uu keyscan lda #%11111110 sta mask lda #%11111101 sta $dc00 lda $dc01 and #%10000000 beq shifted ;left shift pressed lda #%10111111 sta $dc00 lda $dc01 and #%00010000 beq shifted ;right shift pressed lda #<keytabunshifted sta matrixlo lda #>keytabunshifted sta matrixhi jmp scan shifted lda #<keytabshifted sta matrixlo lda #>keytabshifted sta matrixhi scan ldx #$07 rowloop lda mask sta $dc00 ldy $dc01 lda table,y beq next tay lda (matrixlo),y cmp #$01 beq next ;skip left shift cmp #$02 beq next ;skip right shift cmp lastkey beq debounce sta lastkey sta actkey rts next sec rol mask lda matrixlo clc adc #$09 sta matrixlo bcc *+4 inc matrixhi dex bpl rowloop rts debounce lda #$ff sta actkey rts ;unshifted keytabunshifted .byte $ff,$14,$0D,$1D,$88,$85,$86,$87,$11 ;0 .byte $ff,$33,$57,$41,$34,$5A,$53,$45,$01 ;1 .byte $ff,$35,$52,$44,$36,$43,$46,$54,$58 ;2 .byte $ff,$37,$59,$47,$38,$42,$48,$55,$56 ;3 .byte $ff,$39,$49,$4A,$30,$4D,$4B,$4F,$4E ;4 .byte $ff,$2B,$50,$4C,$2D,$2E,$3A,$40,$2C ;5 .byte $ff,$5C,$2A,$3B,$13,$01,$3D,$5E,$2F ;6 .byte $ff,$31,$5F,$04,$32,$20,$02,$51,$03 ;7 .byte $ff keytabshifted .byte $ff,$94,$8D,$9D,$8C,$89,$8A,$8B,$91 .byte $ff,$23,$D7,$C1,$24,$DA,$D3,$C5,$01 .byte $ff,$25,$D2,$C4,$26,$C3,$C6,$D4,$D8 .byte $ff,$27,$D9,$C7,$28,$C2,$C8,$D5,$D6 .byte $ff,$29,$C9,$CA,$30,$CD,$CB,$CF,$CE .byte $ff,$DB,$D0,$CC,$DD,$3E,$5B,$BA,$3C .byte $ff,$A9,$C0,$5D,$93,$01,$3D,$DE,$3F .byte $ff,$21,$5F,$04,$22,$A0,$02,$D1,$83 .byte $ff ;one extra $ff column is added, because the zero value is used to detect unpressed kays
+----+----------------------+--------------------------------------------------- ----------------------------------------------------+ | | | Peek from $dc01 (code in paranthesis): | |row:| $dc00: +------------+------------+------------+------------+------------+------------+- -----------+------------+ | | | BIT 8 | BIT 7 | BIT 6 | BIT 5 | BIT 4 | BIT 3 | BIT 2 | BIT 1 | +----+----------------------+------------+------------+------------+------------ +------------+------------+------------+------------+ |1. | #%11111110 (254/$fe) | DOWN ($ )| F5 ($ )| F3 ($ )| F1 ($ )| F7 ($ )| RIGHT ($ )| RETURN($ )|DELETE ($ )| |2. | #%11111101 (253/$fd) |LEFT-SH($ )| e ($05)| s ($13)| z ($1a)| 4 ($34)| a ($01)| w ($17)| 3 ($33)| |3. | #%11111011 (251/$fb) | x ($18)| t ($14)| f ($06)| c ($03)| 6 ($36)| d ($04)| r ($12)| 5 ($35)| |4. | #%11110111 (247/$f7) | v ($16)| u ($15)| h ($08)| b ($02)| 8 ($38)| g ($07)| y ($19)| 7 ($37)| |5. | #%11101111 (239/$ef) | n ($0e)| o ($0f)| k ($0b)| m ($0d)| 0 ($30)| j ($0a)| i ($09)| 9 ($39)| |6. | #%11011111 (223/$df) | , ($2c)| @ ($00)| : ($3a)| . ($2e)| - ($2d)| l ($0c)| p ($10)| + ($2b)| |7. | #%10111111 (191/$bf) | / ($2f)| ^ ($1e)| = ($3d)|RGHT-SH($ )| HOME ($ )| ; ($3b)| * ($2a)| £ ($1c)| |8. | #%01111111 (127/$7f) | STOP ($ )| q ($11)|COMMODR($ )| SPACE ($20)| 2 ($32)|CONTROL($ )| <- ($1f)| 1 ($31)| +----+----------------------+------------+------------+------------+------------ +------------+------------+------------+------------+
.macro KBCheckKey key ;Returns zero if the checked key is pressed ldy #<(key) ;Keyboard matrix row number in Y lda #>(key) ;Keyboard matrix row value for given key in A and KBMatrixSnapShot,y ;Check given key value against row value in matrix .endmacro ;If equal, Zero flag is cleared .macro KBCheckKeyDown key ;Returns zero if the checked key has a Key Down event ldy #<(key) ;Keyboard matrix row number in Y lda #>(key) ;Keyboard matrix row value for given key in A and KBMatrixKeyDown,y ;Check given key value against row value in matrix .endmacro ;If equal, Zero flag is cleared .macro KBCheckKeyUp key ;Returns zero if the checked key has a Key Up event ldy #<(key) ;Keyboard matrix row number in Y lda #>(key) ;Keyboard matrix row value for given key in A and KBMatrixKeyUp,y ;Check given key value against row value in matrix .endmacro ;If equal, Zero flag is cleared .macro KBAckEvents ;Acknowledge all Key Up/Down events lda #$01 ora KBMSG sta KBMSG .endmacro
KEY_F3 = $2000 ;.byte %00100000,0 KEY_F5 = $4000 ;.byte %01000000,0 KEY_CRSRUD = $8000 ;.byte %10000000,0 KEY_3 = $0101 ;.byte %00000001,1 KEY_W = $0201 ;.byte %00000010,1 KEY_A = $0401 ;.byte %00000100,1
