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First post, by stopi

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I can buy ISA Trident 8800CS card (VGA 15-pin and D-sub 9-pin) at a good price. There's no 8 memory chips on the left as in the picture attached. Will it work or not..?

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Reply 1 of 11, by keropi

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Yes it will, chances are the board is 256k and upgradable to 512kb of vram

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Reply 2 of 11, by candle_86

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should, its got 64k chips x 8

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Reply 3 of 11, by waterbeesje

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Aren't these V53c464; 64k x4?
Any way: These chips should not be too hard to obtain, as these are fairly common. That would take your board up to the full 512kB. It would give you the same slow TVGA 8800 board but will do 800x600 at 256 colours.

By looking at the board I guess it has been repaired in the past, because the lowest chip is from another brand AND a little slower (100ns Vs 80ns for the other ones)

One of my computers runs the 8800 at this higher res in Windows and gives me a reasonably good image (and low speed ofc)

Stuck at 10MHz...

Reply 4 of 11, by Jo22

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I'm speaking under correction, but I believe the numbers on the Trident cards do refer to years.
8800..'88
8900..'89
9000..'90

800x600 in 256c is not shabby for one of the oldest SVGA cards, I think. 😎
Let' s remember, VGA was just released a year earlier (' 87)..

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Reply 5 of 11, by Grzyb

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I wouldn't be sure about 800x600x256.
I had one of those TVGA8800 cards with 256KB of RAM, expanded it to 512KB - and it allowed for 640x480x256 and 1024x768x16, but not 800x600x256.
Some other 512KB cards from that period also exhibit this limitation, see eg. Paradise VGA 1024, based on WD90C00.
I guess not enough memory bandwidth...

Reply 6 of 11, by Jo22

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Grzyb wrote on 2020-06-30, 14:05:

Some other 512KB cards from that period also exhibit this limitation, see eg. Paradise VGA 1024, based on WD90C00.
I guess not enough memory bandwidth...

Yeah, the PVGA1A/1B/1C also falls into this category, I'm afraid.
It could do 256c in 640x400, though, which was remarkable.
Because it worked with 256KiB already.
For Win 2.x, there is a driver for this mode.
The lowest VBE mode also is 640x400 and
works with the Paradise/WD TSRs for VBE. 🙂

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Reply 8 of 11, by waterbeesje

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stopi wrote on 2020-07-01, 19:52:

Is this card fully compatible with machines as 8088 based IBM XT and 386SX? My dream is running two old motherboards I have found last time in the attic 😀 This card is available at cheap price

Compatibele? 99% sure for 8 bit it'll work for the graphics card, as most Trident cards up too 8900 (maybe also most 9000?) will do. Among many other brands that build in backward compatibility (Oak, Chips&tech, early ATI)

Some XT class motherboards require to jumper it correctly (i.e. my Tulip PC Compac 2), some will take it automatically (i.e. my IBM model 30)
Maybe there are early boards out there that did not support VGA because of bios supporting only CGA and MDA and not supporting external graphics bios extension?

For 286 and up, most will let you use 16b VGA cards without any problem in my experience.

I run an 8800 in an XT machine, 8 bit mode. My 8900c (1MB) is capable of this as well, as did a 89oocl (512kB). Another XT runs (actually crawls) a Chips&tech 82c451 16b VGA card in 8 bit mode.

Oh and 800x600 at 256 colours might have been another Trident card... Haven't touched that XT for months...

Stuck at 10MHz...

Reply 9 of 11, by Grzyb

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waterbeesje wrote on 2020-07-02, 11:31:

Maybe there are early boards out there that did not support VGA because of bios supporting only CGA and MDA and not supporting external graphics bios extension?

That's true for the original IBM PC (5150) with the following BIOS dates: 04/24/81, 10/19/81
Support for BIOS extensions was added in 10/27/82

No such limitations in IBM PC/XT (5160) BIOSes.

Reply 10 of 11, by Jo22

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😱

I'm shocked how crude the original PC-Bios was.
I wonder, do XT class BIOSes als work on IBM 5150?
Or are special circuits, like the cassette interface, an issue?

Anyway.. IBM at least added a fix at some point.
Just imagine how many 5150s would have had ended up on the dumpster if they couldn't have had used EGA compatible boards, at least.

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Reply 11 of 11, by lowlytech

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Only other thing i would personally worry about is the windows on the ROMs are not covered. As long as they weren't exposed to too much sunlight hopefully will be okay.