Re: Should I try this Pentium III overclock?

Posted on 2020-11-12, 18:51

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by Synaps3

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

chrismeyer6 wrote on 2020-11-12, 14:57: For the price why not get it and play around but I'd make sure that you have a good CPU cooler and decent airflow in the case. The system sounds like a nice all around utility machine care to post some pictures? https://imgur.com/a/ApKxete

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Re: What capacity disks can this 5.25 floppy drive handle?

Posted on 2020-11-12, 14:42

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by Synaps3

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well, from a quick search, it appears to be only 180K.

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Should I try this Pentium III overclock?

Posted on 2020-11-12, 14:14

by

by Synaps3

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So I've had a Pentium III system for a while running a Tualatin 1.4 GHz with socket adapter. My mobo is an ASUS and supports overclocking. I found this: https://www.ebay.com/itm/Intel-Tualatin-Celeron-1-3GHz-256K-include-On-chip-Socket-Adapter/281931957654 I read in a few places that people have …

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Re: What if Intel made a new 64-bit 386 or 486. . .

Posted on 2020-11-12, 01:47

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by Synaps3

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There are examples (in a lab) of relatively low tech (simple) silicon circuits oscillating stable at around 10ghz, that is where the upper wall seems to exist until you get into 3D circuitry. The only argument that holds water is that the architecture would not run the piss poor bloated 64bit code …

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Re: What if Intel made a new 64-bit 386 or 486. . .

Posted on 2020-11-11, 07:54

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by Synaps3

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If it was possible to run a 386 at several GHz, it would still be slow, as it would spend vast majority of time waiting for memory. 386 lacks cache, and DRAM is still relatively slow. Also, manufacturing a 386 using 7nm technology wouldn't be enough for it to run at GHz frequencies. Yeah, no on- …

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Re: What if Intel made a new 64-bit 386 or 486. . .

Posted on 2020-11-11, 07:51

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by Synaps3

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The Itanium is about the opposite of the 386 or 486, with completely different architecture and (unlike P6 and later) not even trying to translate that effectively into legacy x86. The 386 and 486 are native CISC CPUs where more modern (P6 onwards) x86 CPUs are RISC with an interpreter shell around …

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What if Intel made a new 64-bit 386 or 486. . .

Posted on 2020-11-11, 06:30

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by Synaps3

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

What if Intel made a new 386 or 486 using new technology? 7nm tech, 64-bit, GHz clock and multicore. There would be no extensions like MMX, SSEx, etc. Do you think such a CPU would be much more efficient than a modern one? I would think they could fit way more cores on a die than they can now. I …

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Re: ATX to AT power adapter won't plug in

Posted on 2020-10-11, 21:35

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by Synaps3

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

cyclone3d wrote on 2020-10-11, 21:06: You do have to angle the adapter plug to get the little nubs in place then angle back down and plug in. Haha. Now that I shaved most of them off I realized that I just needed to angle it in my case.

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Re: ATX to AT power adapter won't plug in

Posted on 2020-10-11, 19:27

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by Synaps3

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You mean the little locking nubs on the adapter's AT side? Yes, you should be fine to gently shave them off with a knife. I do it all the time personally. Makes connecting and unconnecting power a breeze. Just make sure when you insert it into the board you use a bit of gentle force to make sure …

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Re: ATX to AT power adapter won't plug in

Posted on 2020-10-11, 19:19

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by Synaps3

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

matze79 wrote on 2020-10-11, 19:10: What XT Mainboard ? Crazily enough, all of them. A true IBM XT mobo. A clone mobo. And a 286 mobo. They ALL have only one nub on each connector whereas the adapter cable has several on each connector (making it not plug in). I looked on ebay and all the ATX to AT …

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ATX to AT power adapter won't plug in

Posted on 2020-10-11, 19:10

by

by Synaps3

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I got an ATX to AT power adapter cable, but there are nubs on the AT plugs that prevent it from plugging in to my XT class mobo. Why is this? I have never seen a post about this so I don't know what to think. Are there different versions of the AT connector and mine is not correct? Can I just cut …

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Re: Every PC XT power supply busted?

Posted on 2020-10-01, 23:26

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by Synaps3

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Do you have a load on the PSUs? I think those XT PSUs require some kind of load to function. If not that then they may be turning off due to another fault on your MB, which is better than destroying the board. It turns out both the floppies and the hard disk needed to be connected for the power …

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Every PC XT power supply busted?

Posted on 2020-10-01, 07:26

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by Synaps3

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I got two different XTs saying that they were tested to power on, but otherwise untested and I got an extra power supply that said it was tested. I tried all three. One of them just buzzes and the other two briefly click and the fans spins for a second and does nothing. So did I just get triple …

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Where can I find a PC XT case/equivalent or broken system?

Posted on 2020-09-15, 20:19

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by Synaps3

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I am building a IBM PC system using new components and so I'm looking for a IBM PC XT case or one that is broken, but with a good condition case. Maybe there is a remake case somewhere? I don't see a subforum for bartering, but maybe someone here has something like this? I know ebay is obvious, but …

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Re: How to make NEC V20HL run at 16 MHz?

Posted on 2020-09-10, 00:08

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by Synaps3

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

In the 1987 NEC microcomputer products catalog they list a uPD71011 clock generator for use with V20/V30 CPUs. However it outputs a clock with 50% duty cycle. Looking at the timing specs for the V20 itself, the allowed range for the clock duty cycle is 41% to 51% which is different than an 8088! …

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Re: How to make NEC V20HL run at 16 MHz?

Posted on 2020-09-08, 18:01

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by Synaps3

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

does anyone make this kind of cards? I assume you mean the pc sprint, not the SBC. https://ctrl-alt-rees.com/downloads/ibmpc/PC-SPRINT.zip https://ctrl-alt-rees.com/2020-03-02-overclocking-the-ibm-5150-8088-cpu-with-pc-sprint.html If not, that sergey board can be purchased on ebay much cheaper than …

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Re: How to make NEC V20HL run at 16 MHz?

Posted on 2020-09-08, 17:54

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by Synaps3

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Anonymous Coward wrote on 2020-09-08, 15:04: 82C84A is good for up to 25MHz. https://www.renesas.com/us/en/www/doc/datasheet/82c84a.pdf It's the CMOS version of 8284. I saw that, but I thought that was the crystal frequency, NOT the output clock frequency which would be / 3. So am I wrong? is that …

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How to make NEC V20HL run at 16 MHz?

Posted on 2020-09-08, 14:53

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by Synaps3

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So I am going to begin building an 8088 clone system - Sergey Kiselev's design. http://www.malinov.com/Home/sergeys-projects/xi-8088 My goal is to get the CPU running at its specified speed of 16 MHz - so technically not an overclock for the CPU itself. The supporting clock generator chip (8284A) is …

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Re: CUV4X-E PIII mobo won't boot anything?

Posted on 2020-03-05, 19:55

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by Synaps3

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

YES! I figured it out!!!!!!!!!!!!!!!! Chip Configuration -> CPU-DRAM back to back transaction -> Disabled Works great so far now. Was able to get the OS to launch. I will actually try installing it at a later time though.

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Re: CUV4X-E PIII mobo won't boot anything?

Posted on 2020-03-05, 17:44

by

by Synaps3

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Alright, I underclocked the CPU and it worked. No, it was not overclocked. Now I just have to figure out if it's the CPU or the mobo just doesn't want to go full speed for some reason. I am using a 1.4GHz PIII and maybe this board just isn't going to work with it. I thought it would though cause the …

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