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Re: KLH / DTK 8088 motherboard ram

Posted on 2022-09-28, 19:28

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You can't add any more onboard memory so you will have to use a card. You can either use EMS, in which a larger block of memory on the card is bank-switched in and out of a portion of the address space (such as D000 or E000) such as a Lo-Tech EMS card, or instead get a card that doesn't support EMS …

KLH / DTK 8088 motherboard ram

Posted on 2022-09-28, 19:15

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I just got this slim 8088 computer and was wondering if I can increase the onboard 640k by swapping out the chips on board? Or am I better off getting an 8-bit Isa card to expand the memory. Thanks TW

Re: Zenith GT capacitors

Posted on 2022-09-15, 20:28

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Wow all good info. The machine was part of a 100 computer haul in a tireless uhaul for 25 years with a rotted out floor on the gulf coast, in a hurricane zone. Humidity was a major factor.

Re: Zenith GT capacitors

Posted on 2022-09-12, 18:57

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

How many shorted SMD-Tantalums have you guys seen going up in fireworks in your lives? Early, radial Tantalums did have issues when operated near their nominal values (e.g. 16V Tantalum at 12V DC). Even erlier, the first Tantalums needed always a (serial) resistor to limit maximum current. This …

Zenith GT capacitors

Posted on 2022-08-27, 01:53

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Going to recap the 22uf 25v button caps on my Zenith with some nice Wurth 105c 5000hr caps. While I'm at it, these other caps, some tants are under the cpu. Very low profile. They still work but as thru are 25yrs+ old I'm pondering doing them as well. Problem is what to use. New tants, ceramics with …

Re: AMD K7 "goldfinger" cloning thread

Posted on 2022-08-13, 13:01

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Is there a reason to use the powered vs the passive?

Re: Making an AMD "goldfinger" clone ?

Posted on 2022-08-08, 13:20

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Count me in TimWolf 😀 Need one to overclock the entire collection Slot A Athlon cpus I received recently with an Abit KA7, for Hwbot. Looks like I'm going with pcbway. Thinking of red because the many red motherboards I have but black matches the cpu.

Re: Upgrading SMD Cx486SLC/e-33MP

Posted on 2022-08-06, 12:47

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You could measure the voltage by probing one of the VCC pins of the processor with a multimeter to be sure. If it turns out it's 5V, it is still possible to use a 3.3V SXLC2 by connecting the VCC pins with a wire, but it's going to be a little hacky! I did the same in this tread: https://www.vogons …

Re: Making an AMD "goldfinger" clone ?

Posted on 2022-08-04, 01:45

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Wow, this has gained some traction once again. Great! Since I have a few of the non-functional Northwind PCBs lying around (and one assembled), I might give your suggestions a try. But I currently don't have too much time to spare for retro activities, so it might take a few days. But I have now …

Re: PB450, Cache, and Melting

Posted on 2022-08-02, 13:54

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Any downsides to trying fresh right way round on the damaged board? I can verify it functions on another PB450 first.

Re: PB450, Cache, and Melting

Posted on 2022-08-02, 12:46

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So the W241024AK-20 seems to be hard to locate. However the 15ns and 12ns variants are available. Any downside to using the faster cache? The onboard ram has issues but can be disabled. Could any damage beside the OP cache and melting have occurred from thier backwards cache?

Re: PB450, Cache, and Melting

Posted on 2022-07-31, 21:51

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So I'm here trying to find out about cache on this pb450 motherboard I bought on eBay a few years ago. And I'm noticing these melt marks on my cache sockets. I start comparing the manufacturing dates on the chips and then realize I have the exact op board. I guess he sold it when he couldn't figure …

Re: Upgrade 40pin zip Vram on PB450 / PB470

Posted on 2022-07-15, 21:38

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Clearly I know nothing. Just want some more vram. So is this one going to work in place of MT4C16257Z-7S ? https://www.datasheetarchive.com/pdf/download … &term=MT4C16256 Thanks

Re: Hot swap clock jumpers?

Posted on 2022-07-15, 20:51

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Doornkaat wrote on 2022-05-17, 07:14: So, did you try it, TimWolf? Yes, makes a great use of the turbo switch on a p1.

Re: AMD K7 "goldfinger" cloning thread

Posted on 2022-07-15, 20:36

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Still hope to get one of these.

Upgrade 40pin zip Vram on PB450 / PB470

Posted on 2022-07-15, 20:34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Trying to upgrade vram on a PB motherboard. It uses 40pin zip ram. Manufacturer calls for this model https://www.datasheets360.com/part/detail/mt4c16257z-7s/-2684707739297131202/ but I can't find it. I ordered NEC UPD424170V-70 but the motherboard does not detect it. Do any of you data sheet gurus …

Re: Looking for ZDS Z-Station 510 BIOS

Posted on 2022-07-02, 07:06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Rise from your grave. I have a PB470 with the Firehawk I 3.x. Is that the best bios this board can take or is there a Mr.Bios? How can I back up the bios and share it? This is a flash chip, not removable.

Re: Tillamook 266MHz and working L2 cache?

Posted on 2022-06-29, 05:19

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

To confirm, no one has gotten 266mhz tillamooks running on a dual Tyan yet?

Re: Skinny DIP-28 Cache sockets needed.

Posted on 2022-05-25, 21:11

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I searched ebay for 28-pin dip sockets, and this was on the first page. https://www.ebay.com/itm/201414959822 That's ebay US. If elsewhere, there are similar offers. (eg I'm in the UK and the same listing would ship to me) Thank you, I was searching USA only. The word "Narrow" was the key that …

Skinny DIP-28 Cache sockets needed.

Posted on 2022-05-25, 20:28

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm trying to find the DIP-28 socket for UM61256FK-15 or equivalent but when I search Google, eBay or Vogons all I find are the fat ones. I guess I need a size to go with this? It's unpopulated on my board and I don't want to solder the chips directly on. What do I need to put in my search to get …

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