Cirrus Logic GD5424

[Jerry]

I've got an old WinSystems PC-104 board with an add-on VGA module that
I got from work (they were throwing it out) that I was wanting to toy
around with. The VGA module has a Cirrus Logic CL-GD5424 chip on it,
which I can't seem to find any information on. I was wondering if
anyone knew anything about this chip. In particular, there's an EPROM
on the module that has what I assume to be the VGA BIOS code in it (I
think I saw some ASCII in the file that said something to that
effect). I was kind of interested in disassembling the BIOS code
(assuming that's what it is), just for educational purposes - to maybe
get an idea of what it's actually doing, but I don't know what kind of
instructions this Cirrus chip would use.

I may be totally off in my assumptions, as I have no experience with
graphics cards and what not, but I'm just curious to get an idea of
how this thing might work. I can't find anything on Google about the
chip, nor on Cirrus's website. Anyway, thanks for any help.


jerry

 

[Rune Christensen]

Hello

AFAIK the video bios is executed by the system processor not the video card
chip.

The company Elpin Systems produces VGA bios
http://www.elpin.com/files/vgabios.pdf

Cheers
Rune

"Jerry" <bluefrog_jam@yahoo.com> skrev i en meddelelse
news:ab9e19a8.0407071433.5baf1611@posting.google.com...

I've got an old WinSystems PC-104 board with an add-on VGA module that
I got from work (they were throwing it out) that I was wanting to toy
around with. The VGA module has a Cirrus Logic CL-GD5424 chip on it,
which I can't seem to find any information on. I was wondering if
anyone knew anything about this chip. In particular, there's an EPROM
on the module that has what I assume to be the VGA BIOS code in it (I
think I saw some ASCII in the file that said something to that
effect). I was kind of interested in disassembling the BIOS code
(assuming that's what it is), just for educational purposes - to maybe
get an idea of what it's actually doing, but I don't know what kind of
instructions this Cirrus chip would use.

I may be totally off in my assumptions, as I have no experience with
graphics cards and what not, but I'm just curious to get an idea of
how this thing might work. I can't find anything on Google about the
chip, nor on Cirrus's website. Anyway, thanks for any help.


jerry

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[Franc Zabkar]

On 7 Jul 2004 15:33:20 -0700, bluefrog_jam@yahoo.com (Jerry) put
finger to keyboard and composed:

I've got an old WinSystems PC-104 board with an add-on VGA module that
I got from work (they were throwing it out) that I was wanting to toy
around with. The VGA module has a Cirrus Logic CL-GD5424 chip on it,
which I can't seem to find any information on. I was wondering if
anyone knew anything about this chip.

I have about 8MB of info on the CL-GD542x series chips, including
circuit diagrams. Email me if interested and I'll upload it to my
webspace. I found this stuff on the Net somewhere ... France, I think.


- Franc Zabkar
--
Please remove one 's' from my address when replying by email.