| | Richard
Registered: Dec 2001
Posts: 621 |
4x4 char smooth Scroll
Please can anyone help?
I know how to do 1x1 scroll text, 1x2 scrolltext, but I don't have a clue how to code a 4x4 charset scroll and how a 4x4 char actually works.
I want to do a 4x4 scrolling routine, for a demo.
Thanx
RB! |
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| | cadaver
Registered: Feb 2002
Posts: 1160 |
Yes, that's actually much simpler and ninjasweeter than what I posted, if you have 64 chars max in your charset.
So it'd be like..
lda (textptr),y ;scrolltext letter ranging from 0 to 63
asl
asl ;now multiplied by 4
ora column ;column counter value from 0 to 3
tax
lda row1tbl,x
sta $0400+21*40+39
lda row2tbl,x
sta $0400+22*40+39
lda row3tbl,x
sta $0400+23*40+39
lda row4tbl,x
sta $0400+24*40+39
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| | Tch
Account closed
Registered: Sep 2004
Posts: 512 |
You can have more than 64..
Usually the: !.,I etc. are not 4 wide. ;) |
| | Honesty
Registered: Jan 2003
Posts: 121 |
Yeah sure you can had more then 64 chars, but this will need some extra tabs with the startposition from the map and another for the length of char.(more memory) and when having an I or a 1 that can be checked from scroll routine and replace the spaceholder for x amount of chars.
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| | Warnock
Registered: Sep 2007
Posts: 28 |
I know this is old....but
4x4 Scroll Routine By: Warnock/Style
This is just the routine. You'll need a start address for
this to work. Can be inserted in existing page...provided
you have four rows available on the screen.
Good Luck!!
This scroll routine uses four char locations.
For Example:
Part 1 $2000
Part 2 $2800
Part 3 $3000
Part 4 $3800
spos .byte $ff
;---------------------------------------
scroll dec sp+1
dec sp+1
dec sp+1
dec sp+1
ora #$07
cmp #$fd
lda sp+1
cmp #$cf
beq px
jmp end
px lda #$d7
sta sp+1
ldx #$00
move lda $0400+761,x
sta $0400+760,x ;row 1
lda $0400+801,x
sta $0400+800,x ;row 2
lda $0400+841,x
sta $0400+840,x ;row 3
lda $0400+881,x
sta $0400+880,x ;row 4
inx
cpx #$27
bne move
read lda text
bne sidepick
lda #<text
sta read+1
lda #>text
sta read+2
jmp read
sidepick ldy #$03 ;values for which char to print
cpy #$01 ;to the screen 4, 3, 2, 1
beq left1
cpy #$02
beq left2
cpy #$03
beq right1
cpy #$04
beq right2
jmp end
left1
sta $0400+760+39 ;row 1 cset1
sta $0400+800+39 ;row 2
sta $0400+840+39 ;row 3
sta $0400+880+39 ;row 4
lda #$02
sta sidepick+1
jmp end ;jmp $73c6
left2
clc
adc #$40
sta $0400+760+39 ;row1 cset2
sta $0400+800+39 ;row2
sta $0400+840+39 ;row3
sta $0400+880+39 ;row4
lda #$03
sta sidepick+1
jmp end
right1
clc
adc #$80
sta $0400+760+39 ;row1 cset3
sta $0400+800+39 ;row2
sta $0400+840+39 ;row3
sta $0400+880+39 ;row4
lda #$04
sta sidepick+1
jmp end
right2
clc
adc #$c0
sta $0400+760+39 ;row1 cset4
sta $0400+800+39 ;row2
sta $0400+840+39 ;row3
sta $0400+880+39 ;row4
lda #$01
sta sidepick+1
inc read+1
bne end
inc read+2
jmp end
end rts
;---------------------------------------
text .byte $20,$14,$05,$13,$14,$09
.byte $0e,$07,$20,$14,$08,$09
.byte $13,$20,$13,$03,$12,$0f
.byte $0c,$0c,$05,$12,$2e,$20
.byte $20,$20,$20,$20,$20,$20
.byte $20,$20,$20,$20,$20,$20
.byte $00
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