+++ /dev/null
-; vi:filetype=z80:
-FB_ADDR equ $4000
-ATTR_ADDR equ $5800
-ULA_PORT equ $fe
-START_ROW equ 3
-
- macro PRINTSTR, row, col, str
- push bc
- push de
- ld b, \row
- ld c, \col
- call calc_cell_addr
- ld hl, \str
- call putstr
- pop de
- pop bc
- endm
-
- macro PRINTVAL, row, col, str
- push bc
- push de
- push hl
- push af
- ld b, \row
- ld c, \col
- call calc_cell_addr
- ld hl, \str
- call putstr
- ld hl, \str
- call strlen
- add e
- ld e, a
- pop af
- call putbin8
- pop hl
- pop de
- pop bc
- endm
-
-
-
-main:
- call init
-
- ld hl, FB_ADDR + 25
- call draw_logo
-
- PRINTSTR START_ROW, 0, str_row0
- PRINTSTR START_ROW + 1, 0, str_row1
- PRINTSTR START_ROW + 2, 0, str_row2
- PRINTSTR START_ROW + 3, 0, str_row3
- PRINTSTR START_ROW + 4, 0, str_row4
- PRINTSTR START_ROW + 5, 0, str_row5
- PRINTSTR START_ROW + 6, 0, str_row6
- PRINTSTR START_ROW + 7, 0, str_row7
-
-.mainloop:
- ld bc, $fefe ; c: port $fe, b: row select $fe
- xor a
-.rowloop:
- push af
- push bc
- add START_ROW
- ld b, a
- ld c, 17
- call calc_cell_addr
-
- pop bc
- in a, (c)
- call putbin5
- rlc b
- pop af
- inc a
- cp $8
- jr nz, .rowloop
- jr .mainloop
-
-init:
- ; setup attributes
- ld hl, ATTR_ADDR
- ld a, $47
- ld b, 24
-.attry: ld c, 32
-.attrx: ld (hl), a
- inc hl
- dec c
- jr nz, .attrx
- dec b
- jr nz, .attry
-
- ; clear screen
- ld hl, FB_ADDR
- xor a
- ld b, 192
-.clry: ld c, 32
-.clrx: ld (hl), a
- inc hl
- dec c
- jr nz, .clrx
- dec b
- jr nz, .clry
-
- ; set border
- out (ULA_PORT), a
-
- ret
-
-; expects X -> c, Y -> b, returns in de
-calc_cell_addr:
- push af
- sla b
- sla b ; change from blocks to pixels
- sla b
- ; construct low address byte -> e
- ld a, b ; start with Y
- sla a
- sla a
- and $e0 ; keep top 3 bits
- ld e, a ; move into e
- ld a, c ; a <- X
- and $1f ; keep low 5 bits
- or e ; combine with Y bits
- ld e, a ; move the result back to e
- ; construct high address byte -> d
- ld a, b ; start with Y again
- sra a
- sra a
- sra a
- and $18 ; keep bits 3 and 4
- ld d, a ; keep it in d
- ld a, b ; grap Y one more time
- and $7 ; keep low 3 bits of Y in a
- or d ; combine with Y6-Y7
- ld bc, FB_ADDR
- or b ; combine with high byte of fb address
- ld d, a ; move result back to d
- pop af
- ret
-
- ; hl: dest
-draw_logo:
- push hl
- ld de, logo
- ld b, 16
-.logoy: ld c, 7
- push bc
-.logox: ld a, (de)
- ld (hl), a
- inc de
- inc l
- dec c
- jr nz, .logox
- ld bc, 7
- sbc hl, bc
- inc h
-
- ld a, h
- and $e7
- ld h, a
- and $7
- jr nz, .skipinc
- ld a, l
- add $20
- ld l, a
-.skipinc:
- pop bc
- dec b
- jr nz, .logoy
- pop hl
-
- ; attr
- ld a, h
- srl a
- srl a
- srl a
- or $58
- ld h, a
- ld a, $42
-
- push hl
- pop ix
- ld b, 7
-.sattr: ld (ix), a
- ld (ix + 32), a
- inc ix
- dec b
- jr nz, .sattr
- ret
-
- ; de: dest
- ; a: char
-putchar:
- ; is it a digit?
- sub '0'
- ret c
- cp 11
- jr nc, .notdigit
- push bc
- ld bc, glyph_0
- jr .common
-.notdigit:
- ; is it A-Z ?
- sub 'A'-'0'
- ret c
- cp 30
- ret nc
- push bc
- ld bc, glyph_a
-.common:
- push de
- push hl
- sla a
- sla a
- sla a
- ld h, 0
- ld l, a
- add hl, bc
- ld c, 8
-.chartop:
- ld a, (hl)
- ld (de), a
- inc d
- inc hl
- dec c
- jr nz, .chartop
- pop hl
- pop de
- pop bc
- ret
-
- ; de: dest
- ; hl: str
-putstr:
- push de
- push bc
-.loop: xor a
- ld b, (hl)
- cp b
- jr z, .done
- ld a, b
- call putchar
- inc hl
- inc e
- jr .loop
-.done: pop bc
- pop de
- ret
-
- ; de: dest
- ; a: number
-putbin8:
- push de
- push bc
- ld b, 8
-.loop: rlca
- push af
- and 1
- add '0'
- call putchar
- pop af
- inc e
- dec b
- jr nz, .loop
- pop bc
- pop de
- ret
-
-putbin5:
- push de
- push bc
- ld b, 5
- rlca
- rlca
- rlca
- jr putbin8.loop
-
- ; hl: string
- ; return -> a
-strlen:
- push hl
- xor a
- ld b, a
-.loop: cp (hl)
- jr z, .done
- inc hl
- inc b
- jr .loop
-.done: ld a, b
- pop hl
- ret
-
-
-str_row0 asciiz 'ROW0: V C X Z [: '
-str_row1 asciiz 'ROW1: G F D S A: '
-str_row2 asciiz 'ROW2: T R E W Q: '
-str_row3 asciiz 'ROW3: 5 4 3 2 1: '
-str_row4 asciiz 'ROW4: 6 7 8 9 0: '
-str_row5 asciiz 'ROW5: Y U I O P: '
-str_row6 asciiz 'ROW6: H J K L ^: '
-str_row7 asciiz 'ROW7: B N M ] \: '
-
- include glyphs.inc
- include logo.inc
projects / zxkeybtest / blobdiff