Re: Using 24 pin PSU on my 20 pin motherboard?

Posted on 2020-11-16, 01:42

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes provided that your power supply have a 4 pin section that separates from your 20 pin ATX connector or unused. Too old power supply will give faults due to tired capacitors get a newer one and try again. I like Seasonic best 500W will do if your is a P4 machine. Try one stick of memory at a time …

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Re: What retro activity did you get up to today?

Posted on 2020-11-16, 01:29

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Deskpro XL power supply troubleshooting continues. Had broken solder joints and one of spade connector on power switch had wire separated so soldered that back on. Fan twitching once every second and one of 3 LEDs flashes. Couldn't find any short circuit nor burnt spots so will unmount all the …

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Re: Are there other forums that discusses older Compaq Pentium servers?

Posted on 2020-11-15, 21:07

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Offically, up to 166MHz using dual CPU card (either single or dual mode) but I'm cautious with dual cpu card since mine wouldn't boot at all. I'll wait till I have money and get single CPU card and try again. Thank you for confirming that helps so much for me! 4.5V lithium battery? Cheers,

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Re: Native PS/2 mouse implementation for 386/486 boards using the keyboard controller

Posted on 2020-11-15, 21:03

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That one connector is burnt and is junk now due to corrosion and burnt. Do not repair these, replace both connector pin and cut a wire with connector from another and transfer this to yours and splice in.

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Re: What retro activity did you get up to today?

Posted on 2020-11-15, 21:01

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Please change backplate for metal, not plastic to support the back of the board where CPU socket is. AMD socket heatsinks exert lot of pressure. Cheers,

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Re: How to fix your dead on-board floppy controller

Posted on 2020-11-15, 03:52

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi Feipoa, The way the solder joints are like this is too cold soldering iron or soldering station's temp too low, or soldering iron's tip dull. Each pin should be touched and wait bit longer to insure it is completely melted then move on to next. Second, not having tube of no-clean flux can cause …

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Re: Dutch members: Tulip Vision Line dt 4/66 (486) CPU jumper help?

Posted on 2020-11-15, 01:40

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Oh no, there's a PAL IC on this cache, that squashes ease of cloning a cache module. Cheers,

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Re: Bought these (retro) hardware today

Posted on 2020-11-14, 17:50

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

SVD wrote on 2020-11-14, 17:02: I found this board in a generic turbo xt case i just got. Is this a combined 386 486 board? Anyone recognize this? Not this one. Cheers,

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Re: Bought these (retro) hardware today

Posted on 2020-11-14, 16:23

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

3M lasted long time, I still have the box of 3M from purchase nearly 8 years ago for working with classic computers. Cheers,

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Re: What retro activity did you get up to today?

Posted on 2020-11-14, 01:22

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Just finished doing two cirrus logic video cards, both had 1MB with two empty sockets each and same type of VRAM so I transferred the two VRAM ICs from GD5436 to GD5430, soldered directly without sockets. Same with GD5436 but I supplied 4 pieces of 50ns for total 2MB, soldered and of course, no …

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Re: Is there other forums that discusses older Compaq Pentium servers?

Posted on 2020-11-14, 01:08

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I can take some pics of mine Proliant 1500 tower in the weekend. Somewhere I have some documentation about it, not sure if its any technical information. Awesome! Document this very well as online search turned up very little on these gems and manuals that I can find were lacking these details. …

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Re: Is there other forums that discusses older Compaq Pentium servers?

Posted on 2020-11-13, 15:25

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

E4 is 2 pin (really looked like was for a jumper but left open), and is bit more below power supply connectors than E10. The power supply with blue power connector is for Proliant 4500, not same as Proliant 1500. I have correct power supply for Proliant 1500 and does not have this E10 connector. …

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Re: Is there other forums that discusses older Compaq Pentium servers?

Posted on 2020-11-13, 00:07

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

VCFED have not allowed me in yet, even I submitted a request to join nearly 5 months ago. Cheers,

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Re: pentium 233 mobo supports up to 64GB hard drive how do i format a 128gb?

Posted on 2020-11-13, 00:01

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Again, not that issue of using OS to support large hard drive on pentium boards. The issue is some of them only can support hard drive size up to 8GB and 64GB comes from bios on pentium boards. You can use a hard drive if you can configure the bios to use 32GB or 64GB and partition that and it will …

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Are there other forums that discusses older Compaq Pentium servers?

Posted on 2020-11-12, 21:46

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Patient: Proliant 1500 tower and same one in rack version which called 1500R which is based on single and dual pentium which I'm working on to resurrect. To anyone who know these, please speak up! The service manual does not show the motherboard diagram and connections. What I need is photo of …

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Re: Is this ESS wavetable ROM chip legit?

Posted on 2020-11-12, 21:27

by

by pentiumspeed

in Marvin \ Sound

in Marvin \ Sound

There is compaq part number on it. CPQ# 214240-001. Cheers,

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

Posted on 2020-11-12, 02:48

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

even modern 486, you cannot dare to break 32 bits software compatibility using 64bits ALU unless it is like pentium working on 32bits processing using 64bits data path instead. Easier still, ask intel to modify one of their old 32bit Atom in-order cpu IP blocks, (230 or N270) by adding ISA and PCI …

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Re: Were VLB video cards ever good?

Posted on 2020-11-12, 02:29

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The main issue with ISA-AT is very lightly buffered (just one TTL per one bus signal) serving overloaded bus serving several slots in parallel presents excessive signal load, thereby more and more less compatible when you reach 10MHz. By 12MHz very rare and much less by 16MHz. ISA AT cannot exceed …

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Re: DREM (DRive EMulator) - MFM/RLL Drive Emulator

Posted on 2020-11-12, 02:10

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Like floppy interface, MFM/RLL interface was hybrid digital and analog using digital signals to control by selecting one of drive(s), for seeking, and for heads selecting with few status signals. For analog signal through 20 pin connector, one signal, and heavily grounded pins and using four …

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Re: Were VLB video cards ever good?

Posted on 2020-11-12, 01:58

by

by pentiumspeed

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Not really. ISA and EISA are usually up t0 10MHz which limits the bandwidth. VLB is just unbuffered 486 pinout at CPU FSB frequency from 16MHz through 40MHz with most compatibility , many overclock to 50MHz but need with care to get that to work well with VLB cards and not all boards can. There was …

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