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Trident TGUI9440 memory upgrades

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Reply 20 of 24, by TheAbandonwareGuy

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I sent you a PM regarding my dead TGUI9440-3

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Reply 21 of 24, by robbiesz

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cj_reha, did you ever manage to upgrade the videocard to 2MB? I just upgraded my PCI bus tgui 9440 from 1MB to 2MB. Like in your case, sticking the RAM chips in the sockets didn't increase the reported memory. However on my card there's a marking on the PCB: 'R25 MD1 Reserved'. R25 was populated. Removing the resistor enabled the other 1MB on the card. Both the power-on screen and aida report 2MB now. Here's a pic of an example card with 2MB RAM, the same marking AND R25 left unpopulated. http://www.vgamuseum.info/images/zaatharen/tr … GUI9440_fhq.jpg

Reply 22 of 24, by Scali

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robbiesz wrote:

cj_reha, did you ever manage to upgrade the videocard to 2MB? I just upgraded my PCI bus tgui 9440 from 1MB to 2MB. Like in your case, sticking the RAM chips in the sockets didn't increase the reported memory. However on my card there's a marking on the PCB: 'R25 MD1 Reserved'. R25 was populated. Removing the resistor enabled the other 1MB on the card. Both the power-on screen and aida report 2MB now. Here's a pic of an example card with 2MB RAM, the same marking AND R25 left unpopulated. http://www.vgamuseum.info/images/zaatharen/tr … GUI9440_fhq.jpg

What happened to C27 there though? 😀
Seems like there was a tantalum cap there that blew out.

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Reply 24 of 24, by perhenden

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In my case, I used two Siemens HYB51417bj-70, taking care to match the speed of the other ram chips on board, or lower. Mine has 70ns chips.
There are multiple chips that will work, they must match the specification, e.g. 256k×16 DRAM FPM 60ns. The socket is SOJ-40.
Take care that there are both EDO and FPM ram used across different TGUI-9440 models, and you need to match the type of the ram chip on board.