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bananaman
Indestructible
Calc Guru
Joined: 12 Sep 2005
Posts: 1124
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 Posted: 23 Nov 2008 09:44:27 pm Post subject: |
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If I am not mistaken SetXXOP1 will only accept values from a between 0..99
Here is my code...
Code:
ld a,(type1)
inc a
ld b,a
sla a
add a,b
bcall(_SetXXOP1)
ld a,1
ld de,20*256 + 70
ld (pencol),de
bcall(_DispOp1a)
For some reason, when I know that (type1)==5, this routine is giving me an ERR:OVERFLOW, but a should only be 18 when the routine is called. Can anyone explain this phenomenon?
Edit:
I tried to simplify it to
Code:
ld a,18
bcall(_SetXXOP1)
and it still didn't work. This is really confusing me.
Last edited by Guest on 23 Nov 2008 10:14:13 pm; edited 1 time in total |
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bananaman
Indestructible
Calc Guru
Joined: 12 Sep 2005
Posts: 1124
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| Posted: 23 Nov 2008 11:00:36 pm Post subject: |
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I figured out how to get around this.
I wrote my own routine that displays the value of a to the current pencol / penrow
Code:
;========================
; disp_a
;------------------------
; input: a, num to display
; current pencol / penrow
; destroys: all but hl
;========================
disp_a:
; if we take the number and modulo 10 and push that number onto the stack and then repeat with a / 10 until a is 0
; we will have them available to pop in the correct order
; we will count the number of numbers in b
ld b,0 ; keep track of amount of digits
disp_a_loop1:
ld c,0 ; keep track of a / 10
disp_a_loop2:
sub 10
jr c,disp_a_mod
inc c
jr disp_a_loop2
disp_a_mod:
inc b
add a,58 ; a was too far down, and 48 will offset with ascii
ld e,a
push de ; push ascii digit onto the stack
ld a,c
cp 0
jr z,disp_a_disp
jr disp_a_loop1
disp_a_disp:
pop de
ld a,e
bcall(_vputmap)
djnz disp_a_disp
ret
I'm sorry for the double post, but I think that this should be placed in here for posterity. If anyone else can think of way to optimize this for speed, I would be happy. |
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DarkerLine
ceci n'est pas une |
Super Elite (Last Title)
Joined: 04 Nov 2003
Posts: 8328
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| Posted: 24 Nov 2008 12:26:08 am Post subject: |
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| what's wrong with using _SetXXXXOP2? |
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bananaman
Indestructible
Calc Guru
Joined: 12 Sep 2005
Posts: 1124
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| Posted: 24 Nov 2008 07:02:41 am Post subject: |
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| Nothing, but most of the numbers that I am working with will be less than 99 so I should be able to use SetXXOP1, but for some reason, even when I try to set 18 to OP1, I get an error. |
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benryves
Active Member
Joined: 23 Feb 2006
Posts: 564
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| Posted: 24 Nov 2008 07:38:11 am Post subject: |
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| DispOP1A displays 'A' digits, so if A is 1 and you try and display 18 you'll get the overflow error. Set A to something suitably large before calling DispOP1A. |
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bananaman
Indestructible
Calc Guru
Joined: 12 Sep 2005
Posts: 1124
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| Posted: 24 Nov 2008 11:00:58 am Post subject: |
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| Ahhhh, thank you. That explains my problem. I was under the impression that it displayed a decimals not digits. |
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