Upgrading the video memory on my Tandy 425SX

[dafivehole]

Tandy says I need the following:

"The computer is shipped with 512KB of video memory. Some VGA modes require
1MB of video memory. To install additional video memory, install four
256KB x 4, 60 ns or faster, fast page-mode DRAMs. Before you begin,
carefully read the following steps and the video memory kit instructions."

I've been told they are ten pin 256kb chips... can anyone point me in the right direction as to where I can get these?

Thanks,
Roger

 

[Maverick1978]

ebay is usually where I go if I can't source them locally. Someone also has chips to sell.

 

[fallemarg]

Are you certain that they are 10 pin chips? I took a look around and I haven't found any 10 pin DIP chips. Is it 10 pins on each side, maybe? Just curious.

 

[Stone]

Since I don't know of any 10 pin chips of this spec here's some 20 pin chips:

http://www.ebay.com/itm/18PC-NEW-KM...4-60NS-DRAM-/131226570209?hash=item1e8db68de1

 

[dafivehole]

Here's a pic of the MB and the chip slots for the Video Memory:
View attachment 26872

 

[Stone]

DUH

20 pin sockets!

 

[dafivehole]

Sorry about that... it's been awhile since I've been working on these computers

Does this make it any easier?!?

Thanks,
Roger

 

[Stone]

I included a link to some chips in a previous post above. That should get you started.

 

[fallemarg]

Yes that helps a lot. Those are 20 pin dip 256kx4 at 60ns or faster. Those are around. I found a listing on e-bay for them. If we can't post links to ebay, please let me know. - http://www.ebay.com/itm/1x-SIEM-HYB...-ns-PDIP-20-/171624145644?hash=item27f598a2ec

 

[dafivehole]

I bought them from this seller (in Israel)... $20 shipped for 4 of them. I didn't think that was a bad deal.

Thank you,
Roger