VOGONS


First post, by cluster.fsck

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Found a Trident 8900D ISA VGA adapter in-box at an estate sale. When I went to test, I noticed the lack of a VGA BIOS ROM, but decided to try anyway. 1 long + 8 short beeps at power on = video adapter test fail, not surprising. Soldered on a DIP28 socket. Found a VGA BIOS that looks like it should work http://minuszerodegrees.net/rom/bin/Trident/T … sion%20C4.5.zip, but I don't quite understand the note attached, First half is EVEN bytes, second half is ODD bytes. Writing (2x) to a SST27SF512 with a TL866II+ as I don't have any 256Mbit chips. Do I just program the file as-is or write a script stripe the even/odd bytes together? I tried both ways with the same result. Anyone have another VGA BIOS I could try? It's also possible that the card is dead, which would explain why the previous owner harvested the BIOS and socket.

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Reply 1 of 11, by Tiido

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Here is a BIOS dump straight from the chip from my T8900D based card : http://www.tmeeco.eu/BitShit/PCschit/T8900D.BIN

T-04YBSC, a new YMF71x based sound card & Official VOGONS thread about it
Newly made 4MB 60ns 30pin SIMMs ~
mida sa loed ? nagunii aru ei saa 😜

Reply 2 of 11, by cluster.fsck

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Thanks, it's a byte-for-byte match with what I downloaded. Good to know I'm supposed to write as-is. I'll order a 256Mbit EPROM and play around with the jumpers, but I'm thinking this one's a goner.

Reply 3 of 11, by Tiido

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I just now notice the card is 8900D-R, and that R should mean there is an internal ROM. Are you sure the EPROM was harvested from the card (i.e solder work was seen on the vias where you put the socket on) ?

T-04YBSC, a new YMF71x based sound card & Official VOGONS thread about it
Newly made 4MB 60ns 30pin SIMMs ~
mida sa loed ? nagunii aru ei saa 😜

Reply 4 of 11, by TheMobRules

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I have one of these cards, the ROM is indeed internal, so probably installing a chip won't change anything. Mine doesn't even have the BIOS socket soldered either, just empty pads.

I recommend to check the jumper settings, I have the manual so here they are (* is the default setting for each, you may try those first).

First the 3 jumpers at the top, it should work regardless of the setting:

J1: Enable second stage zero-wait state (open) / *Disable second stage zero-wait state (closed)
J7: Non-interlaced display (open) / *Interlaced display (closed)
J8: Autodetect 8-bit or 16-bit BIOS (open) / *8-bit BIOS (closed)

Next, J6 and J10 should be kept open and closed respectively to run on a 16-bit slot, you need to add 3 unpopulated jumpers to run on an 8-bit slot and even then it's kind of pointless since it doesn't run on XT-class machines (internal BIOS probably has 286+ code):

J6: *16-bit ISA (open)
J10: *16-bit ISA (closed)

The 0WS jumper (J2)doesn't seem to work for me, so I keep it open.

Finally keep J3 open unless you have 256KB of video RAM.

Reply 5 of 11, by Jo22

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[..] it's kind of pointless since it doesn't run on XT-class machines (internal BIOS probably has 286+ code):[..]

XT class machines can handle 80286 instructions just fine if an 80188/80186 or NEC V20/30 is installed.
With the exception of Protected-Mode or NMI related instructions.

Likewise, an 80286 can handle 386 Real-Mode instructions if EMU386 is loaded.

But that's not really helpful here, I admit.

One of my Trident 8900 cards doesn't work in a 286, too, while another one does (8900S?).
The BIOS was from circa 1991 in each case, I think.

Oh. And I never got one of the cheaper Trident 9000 to work on 286es.
Not sure if that's helpful, either. Sorry. 🙁

Edit: Since a few years, the Trident 8900D is considered to be a worthy rival to the Tseng ET-4000AX.
So maybe it makes sense that it contains 386 instructions for performance reasons? 🤷‍♂️

Edit: Also, some AT motherboards do have a single 8-Bit slot for very old expansions card that won't fit in an 16-Bit slot.

Last edited by Jo22 on 2022-05-19, 00:10. Edited 1 time in total.

"Time, it seems, doesn't flow. For some it's fast, for some it's slow.
In what to one race is no time at all, another race can rise and fall..." - The Minstrel

//My video channel//

Reply 6 of 11, by pentiumspeed

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Jo22 wrote on 2022-05-19, 00:02:
XT class machines can handle 80286 instructions just fine if an 80188/80186 or NEC V20/30 is installed. With the exception of Pr […]
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[..] it's kind of pointless since it doesn't run on XT-class machines (internal BIOS probably has 286+ code):[..]

XT class machines can handle 80286 instructions just fine if an 80188/80186 or NEC V20/30 is installed.
With the exception of Protected-Mode or NMI related instructions.

Likewise, an 80286 can handle 386 Real-Mode instructions if EMU386 is loaded.

But that's not really helpful here, I admit.

One of my Trident 8900 cards doesn't work in a 286, too, while another one does (8900S?).
The BIOS was from circa 1991 in each case, I think.

Oh. And I never got one of the cheaper Trident 9000 to work on 286es.
Not sure if that's helpful, either. Sorry. 🙁

Is one of yours has 2 eeproms in two sockets that works in your 286?

Cheers,
Edit: Since a few years, the Trident 8900D is considered to be a worthy rival to the Tseng ET-4000AX.
So maybe it makes sense that it contains 386 instructions for performance reasons? 🤷‍♂️

Great Northern aka Canada.

Reply 7 of 11, by TheMobRules

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Jo22 wrote on 2022-05-19, 00:02:

Edit: Since a few years, the Trident 8900D is considered to be a worthy rival to the Tseng ET-4000AX.
So maybe it makes sense that it contains 386 instructions for performance reasons? 🤷‍♂️

Now that I think about it, the XT machine in which I tested my Trident has a V20, so the BIOS probably has 386 instructions as you say. The card worked fine on an 8-bit slot of a 386SX.

Reply 8 of 11, by Jo22

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pentiumspeed wrote on 2022-05-19, 00:07:

Is one of yours has 2 eeproms in two sockets that works in your 286?

Cheers,

Hi, it's this one. It has two EPROMs. I could dump them if that's helpful.
Not sure if they compatible with the 8900D, though.
Tiido likely knows more aboutthe matter than me.
All I really know is that the 88xx, 89xx, 90xx prefixes are references to the years of each chip's release/creation.
The suffix likely is used for different revisions, RAM types etc.

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"Time, it seems, doesn't flow. For some it's fast, for some it's slow.
In what to one race is no time at all, another race can rise and fall..." - The Minstrel

//My video channel//

Reply 9 of 11, by cluster.fsck

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Success! Closing J10 was all that was needed. J6 open, J10 open wasn't a valid configuration.

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There was an instruction sheet in the box. Should have though to check jumper settings, but my mind went right to the unpopulated ROM. There wasn't a socket originally and it looked pristine, but I just figured the previous owner did a really good job removing it.

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Thanks!

Reply 10 of 11, by Tiido

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Very good, enjoy the card ~

T-04YBSC, a new YMF71x based sound card & Official VOGONS thread about it
Newly made 4MB 60ns 30pin SIMMs ~
mida sa loed ? nagunii aru ei saa 😜

Reply 11 of 11, by agent_x007

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I found different pin-out manual for 8900D :

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FYI : Two numbers show what mode is enabled for BIOS/ISA bus.
"8" means 8-bit and "16" means 16-bit (more is better)
"Foff" means you aren't using FIFO (enable for higher speed, may present compatibility/stability problems with some MBs)

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