ceda-code-experiments/main.asm

    org 0x1000

prhex = $c174
putchar = $c45e
putstr = $c01b

PUBLIC _main
_main:
    ; "CIAO" vertical stretch
    ld      a,$43
    ld      ($d000),a
    ld      ($d050),a
    ld      a,$49
    ld      ($d001),a
    ld      ($d051),a
    ld      a,$41
    ld      ($d002),a
    ld      ($d052),a
    ld      a,$4f
    ld      ($d003),a
    ld      ($d053),a

    ld      a,$80
    out     ($81),a

    ld      a,$60
    ld      ($d000),a
    ld      ($d001),a
    ld      ($d002),a
    ld      ($d003),a
    ld      a,$70
    ld      ($d050),a
    ld      ($d051),a
    ld      ($d052),a
    ld      ($d053),a

    ld      a,$00
    out     ($81),a

    ; "PIPPO" with blinking underline
    ld      a,$50
    ld      ($d010),a
    ld      a,$49
    ld      ($d011),a
    ld      a,$50
    ld      ($d012),a
    ld      a,$50
    ld      ($d013),a
    ld      a,$4f
    ld      ($d014),a

    ld      a,$80
    out     ($81),a

    ld      a,$20
    ld      ($d010),a
    ld      ($d011),a
    ld      ($d012),a
    ld      ($d013),a
    ld      ($d014),a

    ld      a,$00
    out     ($81),a

    ; "ABC" underline and overline
    ld      a,$41
    ld      ($d020),a
    ld      a,$42
    ld      ($d021),a
    ld      a,$43
    ld      ($d022),a

    ld      a,$80
    out     ($81),a

    ld      a,$50
    ld      ($d020),a
    ld      ($d021),a
    ld      ($d022),a

    ld      a,$00
    out     ($81),a

    jp      ASMPC

delay:
    push    de
    ld      de,$0000
delay_loop:
    dec     de
    ld      a,d
    or      e
    jr      nz,delay_loop

    pop     de
    ret

uart_rx:
    in      a,($b1)
    and     $01
    jr      z,uart_rx
    in      a,($b0)
    ret

uart_tx:
    in      a,($b1)
    and     $04
    jr      z,uart_tx
    ld      a,c
    out     ($b0),a
    ret