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z80 & ez80 Assembly
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Adm.Wiggin
aka Tianon
Know-It-All
Joined: 02 Jun 2003
Posts: 1874
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 Posted: 10 Sep 2003 08:22:55 am Post subject: |
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Um, i know this is weird as im the mod of this forum here, but i have a question :)
ok, I want to add one char to the end of the font as char 255, 254 or one of those that are blank, then change it back when im done... i know its possible, i just cant figure it out :(
Thanks in advance! |
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Tyraniek
Member
Joined: 07 Jun 2003
Posts: 133
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| Posted: 10 Sep 2003 08:42:31 am Post subject: |
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If it is possible (this is surprising because I thought things like fonts were in the ROM), then you just have to find the address in the RAM where chars are stored, and then store yours.
I've got another question : are all the chars 8 pixels large ? I mean, do you think they are stored like a 1 byte large sprite ? |
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NETWizz
Byte by bit
Bandwidth Hog
Joined: 20 May 2003
Posts: 2369
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| Posted: 10 Sep 2003 02:10:02 pm Post subject: |
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I think the font is in ram, so all you have to do is find it.
Still, nobody said it will be on a flash page that is easy to modify.
Basically it will be like this
%11111111
%00000000
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Each letter is 8 bytes
Still, that is not a typical way to change the font.
Here is how it is done:
;Standard TI assembly header
;Stuff to copy hook to appbackupscreeen
;Set pointers et cetera call hook
;pointer is here
pointertoletters:
.db %00000000
.db %00000000
.db %00000000
.db %00000000
.db %00000000
.db %00000000
.db %00000000
.db %00000000
...
endofletters
Go to http://ticalc.org and download Tweak TI and view the source.
Michael V has already done all the work for you. All you need to do is change the letters.
Last edited by Guest on 10 Sep 2003 02:16:10 pm; edited 1 time in total |
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Tyraniek
Member
Joined: 07 Jun 2003
Posts: 133
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| Posted: 10 Sep 2003 02:53:03 pm Post subject: |
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In fact, I don't think each character is 1byte large (8bytes height, OK), because if it was true, we could only display 12 characters on one line (12*8 = 96). Yet, we can display 16 chars on one line, which would mean that a character is 6bits large o_O
I think characters are drawn in the "28 days tutorial", but I don't have it any more. You should take a look. |
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sgm
Calc Guru
Joined: 04 Sep 2003
Posts: 1265
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JacobdeHaan
Member
Joined: 10 Jul 2003
Posts: 165
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| Posted: 10 Sep 2003 07:10:47 pm Post subject: |
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Jbirk wrote: Michael V has already done all the work for you. All you need to do is change the letters.
That's interesting...
check out the author:
http://www.ticalc.org/archives/files/filei.../254/25438.html
edit: Wait a second! That's a basic misc. program! I'm confused...
Last edited by Guest on 10 Sep 2003 07:12:16 pm; edited 1 time in total |
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Adm.Wiggin
aka Tianon
Know-It-All
Joined: 02 Jun 2003
Posts: 1874
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| Posted: 10 Sep 2003 07:24:01 pm Post subject: |
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hey, thanks, i looked on the DS forums, and couldnt find it  THANKS A TON :)
ok, that didnt make sense... i was thanking you for finding it on their forums... ok? good 
Last edited by Guest on 10 Sep 2003 09:53:09 pm; edited 1 time in total |
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Adm.Wiggin
aka Tianon
Know-It-All
Joined: 02 Jun 2003
Posts: 1874
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| Posted: 11 Sep 2003 08:01:43 am Post subject: |
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| ok, guys, i have this : Quote: ;The Font hook -
;Equates:
fontHookPtr = 9B8Ch
_EnableFontHook = 4FE4h
_DisableFontHook = 4FE7h
fontHookActive = 5
fontHookFlag = 35h
;Hook parameters:
Small font - A=0, B=char
Large font - A=1, B=char
FontHook:
.db 83h ; Required for all hooks
or a ; is it small or large font?
jr z,SmallFont
ld a,b ; what character is to be displayed?
cp 'A'
ret nz
ld hl,BigA ; get our replacement bitmap
ld de,lFont_record
ld bc,7 ; copy it into RAM
ldir
ld hl,lFont_record
cp a
ret
SmallFont:
ld a,b ; what character is to be displayed?
cp 'A'
ret nz
ld hl,SmallA ; get our replacement bitmap
ld de,sFont_record
ld bc,8 ; copy it into RAM
ldir
ld hl,sFont_record
cp a
ret
BigA:
.db 00001110b
.db 00010011b
.db 00010011b
.db 00011111b
.db 00010011b
.db 00010011b
.db 00010011b
SmallA:
.db 5
.db 00000000b
.db 00001100b
.db 00010110b
.db 00011110b
.db 00010110b
.db 00010110b
.db 00000000b but that only works for one character unless im super mistaken... how would i fix it to work for all of them? |
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Adm.Wiggin
aka Tianon
Know-It-All
Joined: 02 Jun 2003
Posts: 1874
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| Posted: 15 Sep 2003 09:40:49 pm Post subject: |
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i get no help?  im sad... |
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