Re: (For PCEM) Will upgrading from an I7: 8700 to any I9 compatible with my 300 series chipset offer me any improvements

Posted on 2021-10-30, 02:56

by

by keenerb

in PC Emulation

in PC Emulation

I've started preferring PCEm to Dosbox due to pcem supporting gamewizard32 very well. The cheats and save states are really quite useful to speed up my game time now that I'm an old man with a full-time job...

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Re: Xircom pocket ethernet on Tandy 1000TL?

Posted on 2021-10-27, 22:53

by

by keenerb

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The problem fixed itself at some point during my tinkering.

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Re: Right to repair discussion (split from What retro activity did you get up to today?)

Posted on 2021-10-16, 10:36

by

by keenerb

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

My reply failed to post. Nobody has ever said "Thank god nobody ever sold replacement deep blue chips for Tandy 1000 systems. Also, we'd have been better off of those Olivetti M24 schematics had never been published." Planned / forced obsolescence kinda sucks all around. I dont feel like …

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Re: Right to repair discussion (split from What retro activity did you get up to today?)

Posted on 2021-10-16, 10:16

by

by keenerb

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Doornkaat wrote on 2021-10-16, 10:14: keenerb wrote on 2021-10-16, 10:09: I dont know if there's ever ever been an opinion more opposed to the very spirit of Vogons than "right to repair should be illegal." Very Old Games On Newer Systems 😜 We are in the old hardware forum though.

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Re: Right to repair discussion (split from What retro activity did you get up to today?)

Posted on 2021-10-16, 10:09

by

by keenerb

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I dont know if there's ever ever been an opinion more opposed to the very spirit of Vogons than "right to repair should be illegal."

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Re: Testing oscillators in-circuit on dead motherboard

Posted on 2021-10-11, 21:12

by

by keenerb

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

yeah I replaced all the capacitors in that area as well. i'm going to replace the 28.63636mhz crystal that feeds the FE2010A; that's where the CPU clock and ISA OSC signal are generated, so maybe that's the problem.

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Re: Need advice on beginning soldering and "starter" equipment

Posted on 2021-10-11, 20:34

by

by keenerb

in Milliways

in Milliways

I actually use something like this little guy for about 90% of my soldering now. https://www.amazon.com/UY-CHAN-Programmable-P … /dp/B01MDTO6X7/

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Re: Testing oscillators in-circuit on dead motherboard

Posted on 2021-10-11, 20:21

by

by keenerb

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

On the ISA slot OSC is around 11khz and cpu clock is 3.66mhz. Isn't that around 3/4 what I'd expect to see on those pins? I may be looking at the wrong oscillator being bad.

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Re: Testing oscillators in-circuit on dead motherboard

Posted on 2021-10-11, 20:13

by

by keenerb

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yeah that was only while I was inspecting it. It's in-place now.

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Re: Testing oscillators in-circuit on dead motherboard

Posted on 2021-10-11, 19:20

by

by keenerb

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Sure. It booted but had a disk failure message with the burnt 12v connectors. After cleaning it, and before re-connecting the 12v it stopped booting. I have identified one broken trace but it seems related to the missing battery charging circuit, and the batter has been gone for some time. CPU gets …

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Re: Testing oscillators in-circuit on dead motherboard

Posted on 2021-10-11, 15:10

by

by keenerb

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That's how I felt about the 16 vs. 76 as well, I've never seen a 76mhz on a board before. I'm going through and re-checking all my trace fixes and maybe replace that 16mhz oscillator. There's a much smaller round osc that I can't find any identifiers on, that might not be fun to troubleshoot...

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Testing oscillators in-circuit on dead motherboard

Posted on 2021-10-11, 13:33

by

by keenerb

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

With the system on I don't get any frequency readings across the two legs of the oscillator, and my meter can read up to 60mhz. Is that more or less the proper way to read frequency on an oscillator, just directly across the legs? Basically a short circuit due to battery corrosion burnt the 12v …

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Re: Weird CF behavior

Posted on 2021-09-23, 14:31

by

by keenerb

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Just bought a disk on module; honestly didn't know they even existed. We will see if it solves my troubles. You may still have CHS issues. There is a utility bundled with xt-ide bios that will tell you what the device itself reports for C/H/S. for some reason the xtideuniversalbios site seems to be …

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Re: hole plating lifted on old IPC-T card on 10V 100uf cap on negative lead.

Posted on 2021-09-22, 01:20

by

by keenerb

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm no expert but that's probably waaaay too low for soldering. I use about 320C for lead solder and 340C for lead-free solder, unless I've suddenly gotten horribly confused.

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Top 100 Computer Hardware Collection, a random web page I stumbled across

Posted on 2021-09-22, 01:01

by

by keenerb

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Top 100 Computer Hardware Collection http://www.yjfy.com/ For your information and/or amusement.

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Re: hole plating lifted on old IPC-T card on 10V 100uf cap on negative lead.

Posted on 2021-09-22, 00:40

by

by keenerb

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Looks like it's connected to the ground plane to me, which makes sense if it's the negative lead. The back of that card looks different but only the traces, the component placement looks the same to me. Look at the R1 solder joint at the top-left corner of your picture, how it looks sofr of like a …

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Re: hole plating lifted on old IPC-T card on 10V 100uf cap on negative lead.

Posted on 2021-09-21, 23:51

by

by keenerb

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

What does it look like on the front? I pulled up a picture of another MPU-IPC-T and on the back that lead doesn't seem to connec tot anything. I believe whatever it's connected to is on front of pcb, and my guess is that it might be to the ground plane. http://www.yjfy.com/images/oldhard/sound/MPU- …

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Re: Driver or chipset info for GFE 10/100 Fast Ethernet PCMCIA card?

Posted on 2021-09-21, 23:32

by

by keenerb

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I don't have a windows pcmcia machine, was hoping to get this working in a 200lx. A usenet search turned up a few references to it being an "8390" card, which is possibly NE2000 generic compatible?

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Re: Weird CF behavior

Posted on 2021-09-21, 19:11

by

by keenerb

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I switched from CF to IDE disk-on-modules for almost all of my machines. What you're describing sounds like it could be a LBA or C/H/S change after you've written data to the drive. Upgrading xt-ide bios can cause this in some circumstances.

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Driver or chipset info for GFE 10/100 Fast Ethernet PCMCIA card?

Posted on 2021-09-21, 13:22

by

by keenerb

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

https://www.ebay.com/itm/383590585029 It's the same card as this, but with the dongle. I'm not having much luck.

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