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KIM-1 scrolltext

23.1.21, 20:29 - retro & C64

    ; kim_msg.asm
    ; testing lin2c64 6510 assembler
    ; using J. Butterfield's scan display from Wumpus
    ; 01/03/2013 ces
    
    ; modified code from user chassum on brielcomputers.com/phpBB3
    ; using timer 1 instead (at $1747) and added / fixed 
    ; some chars  21.01.2021 webdoktor @ netzherpes . de
 

    ; define some pseudo-alphabet characters
    A_      .equ $f7
    _a      .equ $5f
    B_      .equ $ff
    _b      .equ $fc
    C_      .equ $b9
    _c      .equ $d8
    _d      .equ $de
    E_      .equ $f9
    _e      .equ $7b
    F_      .equ $f1
    G_      .equ $bd
    _g      .equ $ef
    H_      .equ $f6
    _h      .equ $f4
    I_      .equ $b0
    _i      .equ $10
    J_      .equ $9e
    K_      .equ $f0    ; non-standard
    L_      .equ $b8
    _l      .equ $86
    _m      .equ $a3    ; non-standard
    N_      .equ $b7
    _n      .equ $54
    O_      .equ $bf
    _o      .equ $dc
    P_      .equ $f3
    _q      .equ $e7
    R_      .equ $31
    _r      .equ $d0
    S_      .equ $ed
    _t      .equ $f8
    U_      .equ $be
    _u      .equ $9c
    _v      .equ $c2    ; non-standard
    _w      .equ $0c    ; the right half after _u
    _x      .equ $e4    ; non-standard
    Y_      .equ $ee
    Z_      .equ $5b
    Qmrk    .equ $d3
    dsh     .equ $c0
    spc     .equ $80
    ch0     .equ $bf
    ch1     .equ $86
    ch2     .equ $dB
    ch3     .equ $cf
    ch4     .equ $e6
    ch5     .equ $ed
    ch6     .equ $fd
    ch7     .equ $87
    ch8     .equ $ff
    ch9     .equ $ef

    SAD     .equ $1740      ; data port for pins 1-4
    SADD    .equ $1741
    SBD     .equ $1742      ; data port for pins 5-6
    SBDD    .equ $1743
    TIMER2  .equ $1747      ; optional 2nd 6532 timer
    led1    .equ $08        ; LED selectors (left to right)
    led2    .equ $0a
    led3    .equ $0c
    led4    .equ $0e
    led5    .equ $10
    led6    .equ $12
    lout    .equ $7f        ; set pins as output to left 4 LEDs
    rout    .equ $1e        ; set pins as output to right 2 LEDs
    tmr     .equ $00db
    ptr     .equ $00dc
    xfrhi   .equ $00dd
    xfrlo   .equ $00de
    tmp1    .equ $00df
    cbuff   .equ $00e8

            .org $0180      ; start of data
    msg0    .byte spc spc spc spc spc _n _e _t Z_ _h _e _r P_ _e S_ spc spc spc spc spc spc $00
;            add some spaces in the begginning and end to make it scroll
    msg1    .byte spc ch0 ch1 ch2 ch3 ch4 ch5 ch6 ch7 ch8 ch9 $00
    msg2    .byte _t _h I_ S_ spc I_ S_ spc A_ spc _t E_ S_ _t $00
    msg3    .byte H_ E_ L_ L_ O_ spc _u _w _o _r _l _d $00
    msg4    .byte spc spc spc _b Y_ E_ $00
    MSG5    .BYTE spc spc spc spc spc spc $00

    lo0     .equ <msg0
    hi0     .equ >msg0
    lo1     .equ <msg1
    hi1     .equ >msg1
    lo2     .equ <msg2
    hi2     .equ >msg2
    lo3     .equ <msg3
    hi3     .equ >msg3
    lo4     .equ <msg4
    hi4     .equ >msg4
    lo5     .equ <msg5
    hi5     .equ >msg5

            .org $0200      ; start of code       
    main    ldy #hi0
            lda #lo0
            jsr scan
;            ldy #hi1
;            lda #lo1
;            jsr scan
;            ldy #hi2
;            lda #lo2
;            jsr scan
;            ldy #hi3
;            lda #lo3
;            jsr scan
;            ldy #hi4
;            lda #lo4
;            jsr scan
;            ldy #hi5
;            lda #lo5
;            jsr scan
            jmp main
           
            .org $0300
    scan    sty xfrlo       ; y and a get loaded before jsr to scan
            sta xfrhi
            lda #$07        ; init scan forward
            sta tmp1
            ldy #$05        ; init y
    cont    ldx #$05        ; init x
    char    lda (xfrhi),y   ; get character
            cmp #$00        ; last character?
            bne more        ; if not, continue
            rts
    more    sta cbuff,x     ; store char
            dey             ; set up next char
            dex             ; set up next store loc
            bpl char        ; loop if not 6th char
            cld             ; binary mode
            clc             ; prepare to add (clear carry flag)
            tya             ; get char pointer
            adc tmp1        ; update for 6 new characters
            sta ptr         ; save new pointer
            jsr dspdly      ; delay display
            ldy ptr         ; restore pointer
            jmp cont        ; continue with rest of message
    dspdly  ldx #$0a        ; set the delay rate here
            stx tmr         ; put in decr. location
    time    lda #$52        ; load timer
            sta TIMER2      ; start timer
    lite    jsr disp        ; gosub display rtn
            bit TIMER2      ; timer done?
            bpl lite        ; if not, loop
            dec tmr         ; decrement timer counter
            bne time        ; not finished
            rts             ; now get 6 new characters
    disp    lda #lout       ; change left led segments
            sta SADD        ; to outputs
            ldy #$00        ; init recall index
            ldx #$09        ; init digit number
    six     lda cbuff,y     ; get character
            sty $00fc       ; save y for monitor disp routine
            jsr $1f4e       ; monitor routine - disp char, delay 500 cycles
            iny             ; set up for next char
            cpy #$06        ; 6 char displayed?
            bcc six         ; no
    ;        JSR $1f3d       ; check keypress if you want to
            rts

results in the Punchtape Output

;1801808080808080547BF85BF47BD0F37BED8080808080800080BF0E14
;18019886DBCFE6EDFD87FFEF00F8F4B0ED80B0ED80F780F8F9EDF81399
;1801B000F6F9B8B8BF809C0CDCD086DE00808080FCEEF9008080800F02
;0401C880808000024D
;0A0200A001A9802000034C00020247
;18030084DE85DDA90785DFA005A205B1DDC900D0016095E888CA100CA6
;180318F3D8189865DF85DC202803A4DC4C0A03A20A86DBA9528D470B53
;18033017203E032C471710F8C6DBD0EF60A97F8D4117A000A209B90A26
;0D0348E80084FC204E1FC8C00690F36006BE
;0000090009

Start the programm at 0200.

Have fun,
webdoktor

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