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Re: Help with Zenith Data System Expansion cards (Z-386/25)

Posted on 2024-04-10, 23:58

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I believe you are correct on my cache size. I thought I saw a data sheet that said the CY7170 chips were 8k x 4 bits, but after another search, they are indeed 4k x 4. The other chips are VT20C79 and also 4k x 4. I had a typo in my previous reply, sorry about that. I do not have anything in U175 …

Re: Help with Zenith Data System Expansion cards (Z-386/25)

Posted on 2024-04-03, 23:05

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks! Good to know about the EMS / UMB for when I start playing with mine more. I did locate and order some tag RAM for my cache board. Hopefully it shows up as I have never ordered from that site before. The monitor comes active almost right away when I turn mine on, but it only gives an error …

Re: Help with Zenith Data System Expansion cards (Z-386/25)

Posted on 2024-04-01, 20:54

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi Vetz, I have some pictures of the ESDI/Floppy controller attached. I also have a picture of the crystals on my main board. Changing J102 does not cause my machine to fail booting, but I don't have an OS set up to test the CPU speed. I have not had the POST hang with all the status LEDs stay on …

Re: Help with Zenith Data System Expansion cards (Z-386/25)

Posted on 2024-03-28, 17:02

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi Vetz, I'm sorry for completely missing the notifications about your messages and PMs. Yes, the cache error was shown during POST. It called out the bad chip by the socket number on the cache board. I swapped two of the cache chips around and the issue followed the chip to the new socket number. I …

Re: Help with Zenith Data System Expansion cards (Z-386/25)

Posted on 2023-11-13, 01:15

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here is the service manual for the Zenith Z-386/20/25 and 33E as well as compatible/tested parts list from Zenith on their models. It should have information on memory expansion cards as well as pinout for the powersupply and lots of other neat information This was scanned back in 2018, not …

Re: Help with Zenith Data System Expansion cards (Z-386/25)

Posted on 2023-11-12, 22:11

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I used to with the zeniths, The first card with C&T 82C206 chipset and ports, diagnostic LEDs, is a CPU bus to ISA bridge board. You need 2 bios firmware ICs, One is missing. Does this explain you have no boot? The row of red LEDs indicates voltages (5V, 12V, -5V and -12V, power good), is present …

Re: Help with Zenith Data System Expansion cards (Z-386/25)

Posted on 2023-11-12, 22:01

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

@vetz, can you upload the manual to Internet Archive, so that we can all use it? Thanks! - Alex Any good resources on how to best do it? Formats, how to include OCR and what not. On the software side there's a Linux app I really like called gscan2pdf that works well for processing scanned documents …

Re: Help with Zenith Data System Expansion cards (Z-386/25)

Posted on 2022-10-01, 02:04

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks! I will keep tinkering and see what I come up with. I remembered another stash of RAM that I recently got and found three sticks in there compatible with this machine, so now I am up to a whopping 20MB on board. 4x 1MB sticks, 3x 4MB sticks, plus 4x 1MB 30-pin SIMMs in an adapter. I think my …

Re: Help with Zenith Data System Expansion cards (Z-386/25)

Posted on 2022-10-01, 01:12

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I never considered that since I have such limited experience with machines this old. If it an EMS board, that would make sense why the CMOS doesn't see it. I've also been playing around with seeing what RAM I can get it to recognize just on the motherboard and found that it sees the 2MB sticks on …

Re: Help with Zenith Data System Expansion cards (Z-386/25)

Posted on 2022-09-30, 23:46

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Attached to this post are the pictures of the above mentioned RAM expansion board.

Help with Zenith Data System Expansion cards (Z-386/25)

Posted on 2022-09-30, 23:45

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi Vogons, I am working on a Zenith 386DX system (Model Z-386/25) and am having a hard time finding documentation on a couple expansion cards that came in the system and wanted to know if anyone here could help. One is an I/O card (part number 85-3426) that has the BIOS chips, Serial ports, Parallel …

Re: Socket 7 and Slot 1 Proprietary Motherboards - What to do with 'em?

Posted on 2021-11-25, 03:11

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here's a small update.... I had a chance to play with the KZM-6120 boards for a brief moment this evening. They are from an HP Vectra Vli 8SF machine. BIOS files, drivers, and documentation are already available over here . Of the three boards, I found one that seems happy in POST, one that seems to …

Re: Socket 7 and Slot 1 Proprietary Motherboards - What to do with 'em?

Posted on 2021-11-18, 20:51

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I recently had to flash a board without a chip programmer and no floppy drive and no windows flashing support. I booted to hirens and used whatever version of awdflash or some flash utility that was included with the bios on jan’s website. Worked great! but for saving bios, just boot to hirens mini …

Re: Socket 7 and Slot 1 Proprietary Motherboards - What to do with 'em?

Posted on 2021-11-18, 19:25

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I almost forgot about all the utilities that come on Hiren's / Falcon Four. I guess I can give that a shot when I test out the boards that I am able to test, some of the boards have what looks to be proprietary power connectors.

Re: Socket 7 and Slot 1 Proprietary Motherboards - What to do with 'em?

Posted on 2021-11-15, 23:27

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

dataino.it wrote on 2021-11-15, 22:36: Post a good pic https://www.ultimateretro.net/en/ need continuous update if u can dump bios is the best they will have been useful for something. I'll see what I can do. I don't think I have the equipment to dump the BIOSes unless they're DIP chips. (I have a …

Re: Socket 7 and Slot Proprietary Motherboards - What to do with 'em?

Posted on 2021-11-15, 20:13

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks for the suggestions, I will probably get them listed on eBay when I get the time and see of they sell. I have plenty of other boards to play with, so I don't really need these. The stack in the middle are labeled with KZM-6120 , which is apparently made by FIC and used in some HP Vectra …

Re: PAS 16 WfW 3.11 frustrations

Posted on 2021-11-14, 22:15

in Marvin \ Sound

in Marvin \ Sound

I apparently completely failed to notice the replies on this thread after my last post.... Sorry about that! Anyway, I ended up putting in my SB16 PnP Value card and it is working as well as I can hope. With that being said, I was blessed with a load of old hardware yesterday. Nothing super …

Socket 7 and Slot 1 Proprietary Motherboards - What to do with 'em?

Posted on 2021-11-14, 22:05

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi Vogons, Yesterday I ended up with a large amount of older PC hardware parts and pieces. In the lot is several proprietary motherboards - most with their respective riser cards. I am wondering what the heck to do with 'em. I don't have cases for them, and have plenty of other hardware to play with …

Re: PAS 16 WfW 3.11 frustrations

Posted on 2021-09-19, 23:43

in Marvin \ Sound

in Marvin \ Sound

Well, I managed to get the driver archive downloaded and found the file I was looking for. Unfortunately, it is just a copy of an already-installed driver directory and doesn't have the windows-related drivers (just DOS drivers), though the file dates are newer than the other ones I have played with …

Re: PAS 16 WfW 3.11 frustrations

Posted on 2021-09-18, 20:03

in Marvin \ Sound

in Marvin \ Sound

Thank you all for the suggestions. So far I have been unable to download the soundcard drivers archive. My ISP has some minor hiccups every now and then. When that happens the download fails, and trying to resume it results in a corrupted file ( I have tried using the built-in Firefox download …

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