VOGONS


First post, by pvb03

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Hi!
I recently picked up a 386SX-system. In it was an old BTC CD-ROM controller card with 34 and 40-pin connectors as well as the accompanying drive.
This is an 8-bit ISA card that sais "BTC 11V0" or "11VO". Don't know if that's a zero or an O.
I tried connecting a known working IDE drive to the 40-pin header. Pin 20 was missing so I was kind of confident this being an IDE controller. Probably not though as I got none of my known good drives to work.

The drivers I tried were: oakcdrom.sys, vide-cdd.sys and a random btccdrom.sys I found online that also turned out only to be an IDE ATAPI driver that didn't help.
I do know how to set up a CD-Rom driver in DOS and as a sanity check I installed a random IDE CD-Rom controller and a post-2000 LG 40x IDE drive and it worked just fine. So I don't think this is a stupid problem on my behalf.

The drive that has the 34-pin connector seems to work, it plays audio cds using the play button on the front.

I took photos of everything with information on it. There is no actual model number on the drive!

Has anyone of you ever encountered a 34-pin CD-ROM drive?
I really don't know what else to try.

Thanks for your time.

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Reply 1 of 15, by derSammler

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First thing to notice on the card is that JP6 and JP2 for setting IRQ/DMA were desoldered for whatever reason. So you need to fix this.

Second, the 40-pin connector can not be IDE, since the card is 8-bit. You may have damaged the card by connecting an IDE drive to it. Due to its age, the PAL chip can be dead as well.

Anyway, what you need to do: fix JP6 and JP2, set them correctly, and get the drivers for the CD-ROM installed. The interface is Sony, so early Sony drivers should work for this BTC drive.

Reply 2 of 15, by pvb03

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Okay, that's something to start with. I definitely found this card in this state in the computer. I think this card came like this. Here is the only other picture of one I found on the internet.
https://forum.classic-computing.de/forum/inde … ss-pinbelegung/

Looks like they're missing there too.

Reply 3 of 15, by derSammler

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The question is if it was ever working in that 386. At least on your card you can clearly see that the jumpers were desoldered - that's not how unused solder points would look like. Also, the "QC PASS" label has an edge towards JP2, as if it was peeled off there for some reason.

Now it could be that only one of the interfaces on the card needs IRQ and DMA, the Sony interface certainly needs them, though. Still possible that despite being 34-pin, BTC made its own interface and this is not Sony-compatible. But I kind of doubt that.

Installing the jumpers and trying the Sony drivers won't hurt the card, however, so I would try that in any case.

Reply 4 of 15, by maxtherabbit

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before you go messing about with unpopulated IRQ/DMA jumper footprints, I would try loading a proper driver for the Sony CDROM - ATAPI ones will obviously not work

the 40 pin header is very likely for either the Panasonic or Mitsumi CDROM interface

Reply 5 of 15, by maxtherabbit

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I see no evidence that pin headers were manually desoldered - if that was the case the through holes would be at least partially evacuated. But they are full of solder.

Reply 6 of 15, by derSammler

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maxtherabbit wrote on 2020-05-05, 14:25:

I see no evidence that pin headers were manually desoldered - if that was the case the through holes would be at least partially evacuated. But they are full of solder.

Seriously? Are you looking at the same picture?

btc.jpg

You can even see the spots that were formed when the pins were pulled out and the solder still hot. And you can tell that whoever did it used too much heat and too less flux.

Reply 7 of 15, by maxtherabbit

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so you think that the other picture that he found of the same card, also with those headers unpopulated, just happens to be a coincidence?

also riddle me this: if there was originally a pin header installed at the factory, how did they manage to place that "QC pass" sticker under where the insulation would have been?

Reply 8 of 15, by derSammler

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I already expressed my thoughts about these two observations earlier, but I guess you didn't read (click here if you are lazy). Just like you apparently didn't look at the picture before claiming that there are no signs of desoldering. But at least you repeated my already-made suggestion that he should try with the Sony CD-ROM drivers...

And just for the record, the Sony interface supports i/o polling, interrupt-driven, and DMA transfer. So these jumpers make sense but are not absolutely required. But then you are stuck with i/o polling, which is the worst you can have, especially on a slow 386. Quite possible that someone already messed with that in the past.

Reply 9 of 15, by maxtherabbit

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I absolutely did look at the picture, and still think you are smoking some good shit if you think someone manually desoldered a pin header off of that card

Reply 10 of 15, by matze79

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I have those Controller with CD-ROM Drive,
Any ideas if this is Sony Compatible Drive or Panasonic ?

Also missing Driver Disk.

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https://www.retrokits.de - blog, retro projects, hdd clicker, diy soundcards etc
https://www.retroianer.de - german retro computer board

Reply 11 of 15, by matze79

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Sony Driver 1.73A doesnt work.
Dolphin CD-ROM Driver doesnt work.

https://www.retrokits.de - blog, retro projects, hdd clicker, diy soundcards etc
https://www.retroianer.de - german retro computer board

Reply 12 of 15, by matze79

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My mechanics are partially broken (Tray open), but here is a closeup of the Circuit Board.

It contains OTI012 Interface Chip.

OTI011 is inside some NEC Drives, maybe NEC Driver will work then.

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    Mechanics
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    ROM 6010 Rev 6
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https://www.retrokits.de - blog, retro projects, hdd clicker, diy soundcards etc
https://www.retroianer.de - german retro computer board

Reply 13 of 15, by Robin4

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This could be the same drive

https://www.ebay.com/itm/195671468271

just google on TXCD a4.

s-l1600.jpg

Picture saying its a sony bus.

Some features on the box

s-l1600.jpg

Saying its a dual speed drive.

s-l1600.jpg

~ At least it can do black and white~

Reply 14 of 15, by matze79

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This Drive uses same Chipset

Attached driver too.

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https://www.retrokits.de - blog, retro projects, hdd clicker, diy soundcards etc
https://www.retroianer.de - german retro computer board

Reply 15 of 15, by rasz_pl

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I have a vague memory of my first CDROM being 2x BTC plugged into Aztech sound card (one with 3 cdrom interfaces). I dont remember which driver it used.

Open Source AT&T Globalyst/NCR/FIC 486-GAC-2 proprietary Cache Module reproduction