VOGONS


First post, by blackmasked

User metadata
Rank Newbie
Rank
Newbie

I recently aquirred a Cirrus Logic CL-GD5426-80QC-A VLB 1MB card that I plan to use in a 486 build I've beeing working on for the last 2 years.
I'd like to upgrade its memory to 2MB at some point in the future, but I'm not quite sure what kind of modules I should be looking for.

As you can see from the picture it has 2x Panasonic MN414260SJ-08 DRAM modules installed, which according to datasheet are 80ns.
Obviously I'll need some DIP20 modules, 8 in total, 128k each, 80ns. Can they be 70ns or faster or do they have to match modules that are already installed?
Is there anything else I need to keep an eye for apart from capacity, speed and number of PINs?

Attachments

  • vlb.jpg
    Filename
    vlb.jpg
    File size
    1.07 MiB
    Views
    179 views
    File license
    Public domain

DOS build: Gigabyte GA-586T2, P200 MMX, 64MB RAM, Tseng ET6000 4MB, Sound Blaster AWE64 Gold, Roland SC-55mkII, Yamaha MU-80
98SE build: MSI MS-6163 Pro, PIII 650MHz, 256MB RAM, Voodoo3 3000, Sound Blaster Live! 5.1 Platinum, Yamaha SW1000XG

Reply 1 of 3, by gerwin

User metadata
Rank l33t
Rank
l33t

I was looking for this old topic:
Questions about VLB video ram ?
Unfortunately it seems to lack direct answers to your questions, but it may still be interesting for you.

--> ISA Soundcard Overview // Doom MBF 2.04 // SetMul

Reply 2 of 3, by mpe

User metadata
Rank Oldbie
Rank
Oldbie

You need 256K × 4 bit DIP20 DRAM modules. Either 80 or 70ns. Those are obviously different than the 16bit modules already installed so you cannot use chips matching the ones installed.

Speed depends on which MCLK is programmed into the card BIOS. But you should be fine with 70ns.

That's being said, once the 2nd MB is installed, the only difference it is going to give you is 1280 × 1024 / 256 colour and 1024 x 768 x 65k modes a at 43.65Hz interlaced mode (so pretty much useless). I couldn't be bothered installing it.

Blog|NexGen 586|S4

Reply 3 of 3, by blackmasked

User metadata
Rank Newbie
Rank
Newbie

Considering that this machine will never bo used to display resolutions that high, I guess upgrading it will be rather pointless. Thanks for the advice gentlemen.

DOS build: Gigabyte GA-586T2, P200 MMX, 64MB RAM, Tseng ET6000 4MB, Sound Blaster AWE64 Gold, Roland SC-55mkII, Yamaha MU-80
98SE build: MSI MS-6163 Pro, PIII 650MHz, 256MB RAM, Voodoo3 3000, Sound Blaster Live! 5.1 Platinum, Yamaha SW1000XG