Help finding an IBM PS/1 Mod. 2133-540 video memory upgrade \ VOGONS

Help finding an IBM PS/1 Mod. 2133-540 video memory upgrade

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First post, by igna78

Posted on 2020-12-05, 18:05

igna78 Offline

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Hello everyone, I'm looking for help finding an upgrade for the video memory of an IBM 2133-540 PC. The video system is based on a CL-GD5424 video chip with 512K of memory, expandable to 1MB via 512K expansion over 40pin zif. Any idea how / where to find this component? Thanks everyone for your time

Last edited by igna78 on 2020-12-07, 23:19. Edited 1 time in total.

Reply 1 of 8, by cyclone3d

Posted on 2020-12-05, 18:19

cyclone3d Offline

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I'm guessing this is onboard graphics.

Pics of the motherboard would help.

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Reply 2 of 8, by igna78

Posted on 2020-12-06, 17:56

igna78 Offline

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As requested, here are some images of the motherboard with the detail of the insertion socket for the expansion of the video memory

IMG_8639.jpg

IMG_8640.jpg

As I said I am looking for the 512K video expansion .. I have no idea where or how to look, so I thank anyone who wants to help me in my research 😀

Reply 3 of 8, by igna78

Posted on 2020-12-09, 20:59

igna78 Offline

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Any idea?

Reply 4 of 8, by Caluser2000

Posted on 2020-12-09, 22:00

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Reply 5 of 8, by cyclone3d

Posted on 2020-12-10, 08:08

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I think this may be what you are looking for:
https://www.ebay.com/itm/UPD424260V-70-V20-25 … -1/153203289210

Your board looks like the soldered on chip is 60 ns but these I found are 70 ns so not 100% sure it will work.

Just for future reference, that style of chip is called ZIP.

Yamaha modified setupds and drivers
Yamaha XG repository
YMF7x4 Guide
Aopen AW744L II SB-LINK

Reply 6 of 8, by igna78

Posted on 2020-12-10, 11:33

igna78 Offline

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Thanks for the help ... actually the soldered chip is 80ns so I hope adding a faster one will work

Reply 7 of 8, by cyclone3d

Posted on 2020-12-10, 20:10

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Faster one should definitely work fine.

Yamaha modified setupds and drivers
Yamaha XG repository
YMF7x4 Guide
Aopen AW744L II SB-LINK

Reply 8 of 8, by retroegde

Posted on 2023-08-04, 05:57

retroegde Offline

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I know this is dated by I found this when searching for information on my IBM 2133-23c. I've been able to successfully upgrade the video memory for the CL-GD5424 on my IBM 2133-23c and 2155A-24C PS/1 computers. I soldered an additional chip in the available pads. @Epictronics1 on youtube has a video on this upgrade. Just be careful in the tight space with your soldering iron!

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