VOGONS


First post, by evoportals

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Hello Vogon,

I come to you in a time of need. Many moons ago in 1996 when I was a teen my dad upgraded our 386 desktop to a 486 DX4 120mhz. It lasted for years and was a really good PC until we finally moved on to a PIII 450mhz in 1999. The only remnants that remain of this childhood PC is the case, the 486 cpu, 3com ISA network card, and the box from a Sound Blaster Pro. Regrettably, most of the parts were thrown away when we upgraded.

I've SCOURED the internet looking for the model of the motherboard. Going by memory here is the description of it.

  • Ran a 486 DX4 120mz
  • It MUST have had 8 SIPP and 2 SIMM memory slots because in my high school electronics class there was this idiot that was stealing memory from his part time job at a computer shop and sold me 8x 1mb SIPP and 2x 4mb DIMM memory modules for less than half the price which we used totaling 16mb.
  • NO PCI slots, all ISA and VLB
  • At least a few VLB slots

The layout looked something like this but a gold color and I have vivid memory of there being a single voltage regulator with heatsink near the CPU socket.
https://www.elhvb.com/webhq/models/486vlb3/m912v17p.jpg

Please, if anyone knows of a motherboard with 8x SIPP and 2x SIMM memory slots that ran DX4 486 CPUs and was all ISA with a few VLB slots, please share. Along with a single voltage regulator with heatsink near the CPU socket.

Reply 1 of 6, by NeoG_

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Might be one of these

https://theretroweb.com/motherboards/s/tmc-my … at48pr-ver.-1.4
https://theretroweb.com/motherboards/s/tmc-my … p-mynix-pet48pn
https://theretroweb.com/motherboards/s/unknow … 486-v-i-p-rev-a (has PCI)

Edit: Neither of the other two have a 40Mhz FSB jumper either, strike out

98/DOS Rig: BabyAT AladdinV, K6-2+/550, V3 2000, 128MB PC100, 20GB HDD, 128GB SD2IDE, SB Live!, SB16-SCSI, PicoGUS, WP32 McCake, iNFRA CD, ZIP100
XP Rig: Lian Li PC-10 ATX, Gigabyte X38-DQ6, Core2Duo E6800, ATi HD5870, 2GB DDR2, 2TB HDD, X-Fi XtremeGamer

Reply 2 of 6, by Disruptor

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SIPP? That was common in the 286 times.
You surely mean 30 pin SIMM and 72 pin PS/2 SIMM sockets.

It would have been good when you remember whether it were 2 or 3 VL slots.

Reply 3 of 6, by NeoG_

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I randomly started watching this MikeTech video and remembered this thread - This motherboard checks all of the boxes
https://www.youtube.com/watch?v=Bk9M_aKPrME

M-Tech (MTI)/Rise R407 VESA 486
https://theretroweb.com/motherboards/s/m-tech … 7-vesa-486#docs

- Can be jumpered for 120Mhz CPUs on a 40Mhz bus
- 8x 30pin and 2x 72pin memory sockets
- No PCI
- Multiple VLB Slots
- Has a voltage regulator with heatsink near the CPU socket
- Gold PCB

Last edited by NeoG_ on 2025-11-03, 11:00. Edited 1 time in total.

98/DOS Rig: BabyAT AladdinV, K6-2+/550, V3 2000, 128MB PC100, 20GB HDD, 128GB SD2IDE, SB Live!, SB16-SCSI, PicoGUS, WP32 McCake, iNFRA CD, ZIP100
XP Rig: Lian Li PC-10 ATX, Gigabyte X38-DQ6, Core2Duo E6800, ATi HD5870, 2GB DDR2, 2TB HDD, X-Fi XtremeGamer

Reply 4 of 6, by mkarcher

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NeoG_ wrote on 2025-11-01, 05:18:

Edit: Neither of the other two have a 40Mhz FSB jumper either, strike out

Many 486 boards used frequency generators that were able to generate 40MHz FSB, even if the required jumper setting was not documented in the manual. While you wouldn't find a board without a 40MHz setting in a ready-built system, you might find a board upgraded to that DX4-120 by an enthusiast running at an undocumented setting.

For example, I used https://theretroweb.com/motherboards/s/ecs-um486v-aio for a long time with a Cyrix DX40 first, and then with a ST DX2/80 (also a Cyrix core) without any issue.

Reply 5 of 6, by Anonymous Coward

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I'm going to second the M-tech R407. Those were pretty commonly paired with the DX4-120. Also, having eight 30-pin SIMM slots and two 72-pin SIMM slots on the same board was pretty uncommon in the 3.3V CPU era, but it was something M-tech specialized in as a way for you to move your memory with you from a 386 or slower 486 motherboard.

I like how you described your 486 as something that "lasted for years". 3 years actually...not all that long. You're just experiencing time dilation. Time seemed to pass slower when you were younger.
I had my 486 for five years before I went to socket 7. That felt like an eternity. Right now I'm running a desktop pc based on Sandybridge 2.4GHZ Celeron that I assembled in 2011 and it seems like yesterday.

"Will the highways on the internets become more few?" -Gee Dubya
V'Ger XT|Upgraded AT|Ultimate 386|Super VL/EISA 486|SMP VL/EISA Pentium

Reply 6 of 6, by the3dfxdude

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I want to mention, that the page on theretroweb.com for the R407, there is also a page for the R407E. Those pages show identical hardware and shouldn't be that way. This error perpetuated from the original Total Hardware. Mike updated the R407 with an image he made of his board, but he really has an R407E/W etc, and should have updated the other page. I have the actual R407, which does not have a voltage regulator, and has a slightly different layout, BIOS, and jumpers

So with that, the page for theretroweb.com for the R407 is wrong. There is no manual or jumper information on the R407 out there, so I reversed engineered it the best I could.