recently obtained 486 goodness - TEXAS INSTRUMENTS 486DX2-80 and INTEL 486DX2-66 \ VOGONS

recently obtained 486 goodness - TEXAS INSTRUMENTS 486DX2-80 and INTEL 486DX2-66

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First post, by rgart

Posted on 2013-09-02, 06:23

rgart Offline

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Posts: 738
Joined: 2013-04-16, 05:32
Location: Australia

these pieces of hardware recently found their way to me!

I'm most excited about the cases but the V6.1 motherboard looks to be of decent quality too...

Do either of these motherboards look familiar to you guys?
I haven't had a look for manuals online yet and I'm not sure on model/part numbers.

[System 1]

OS: Windows 95 Plus

486 dx2 80mhz (Texas Instruments 486DX2-80 (Windows Logo)
VLB motherboard (V6.1) (unknown) + soldered cache (unknown)
Cirrus Logic CLVGA542VXL/H VLB REV 2.0 (CL-GD5429-86QC-B)

[System 2]

OS: Windows 98

486 dx2 66mhz (Intel Overdrive DX20DP66 66MHz)
32MB 8(4MB) x 30pin simms
VLB motherboard (SiS 85C471/85C407 chipset)
256k 15ns cache (MOSSEL MS62256H-15NC) (double banked)
VLB TSENG ET4000/W32 1MB (TC6147AF)
Adaptec AHA-1542CF/1540CF Host Adapter
3 x SCSI Quantum Fireballs
Creative CT2770 SB16 Value
Generic IDE CD-ROM
Generic IO Card (UMC UM82C863F/UM82C865F)
Generic ISA Internal Modem
Generic ISA Network Card

(clearly these parts were picked with love back in 1993 or there abouts 😜)

-BATTERY LEAKAGE-

Vinegar and a Toothbrush?

I believe the battery has started to leak and there is minor damage to the motherboard.

Last edited by rgart on 2016-04-21, 09:37. Edited 4 times in total.

=My Cyrix 5x86 systems : 120MHz vs 133MHz=. =My 486DX2-66MHz=

Reply 1 of 6, by rgart

Posted on 2013-09-02, 08:21

rgart Offline

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Posts: 738
Joined: 2013-04-16, 05:32
Location: Australia

regarding the first motherboard mentioned with the v6.1 print.

It appears to be a PCPCHIPS Cheetah v6.1 with fake cache. What a shame.

http://www.rainbow-software.org/images/hardwa … cheetah_v61.jpg

"PC Chips Cheetah 486 board v6.1, no CPU, no RAM, fake cache"

=My Cyrix 5x86 systems : 120MHz vs 133MHz=. =My 486DX2-66MHz=

Reply 2 of 6, by Half-Saint

Posted on 2013-09-02, 09:11

Half-Saint Offline

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Joined: 2013-07-26, 04:27
Location: Slovenia

The 2nd build looks like a beast 😀

Reply 3 of 6, by BastlerMike

Posted on 2013-09-07, 11:46

BastlerMike Offline

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Joined: 2010-10-11, 15:53

You fake cache mainboard looks like a more recent verson of the PC Chips M912 which uses SOJ instead of the usual DIP SRAM chips. It seems to support 1024 kB. I know exactly what I would do with this board 😀 provide some real cache.

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Reply 4 of 6, by rgart

Posted on 2013-09-07, 14:10

rgart Offline

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Rank: Oldbie
Posts: 738
Joined: 2013-04-16, 05:32
Location: Australia

BastlerMike wrote:
You fake cache mainboard looks like a more recent verson of the PC Chips M912 which uses SOJ instead of the usual DIP SRAM chips. It seems to support 1024 kB. I know exactly what I would do with this board 😀 provide some real cache.

It does look suspiciously like a M912...

I just re-inspected the board and tested the cache with a couple of different programs.
cachechk and speedsys both reporting no L2 cache.

Its strange the traces look fine. I guess it really is fake.

The board itself works great and looks brand new.

I had a brief look at the bios and it looks very comprehensive.

=My Cyrix 5x86 systems : 120MHz vs 133MHz=. =My 486DX2-66MHz=

Reply 5 of 6, by rgart

Posted on 2013-09-11, 14:51

rgart Offline

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Rank: Oldbie
Posts: 738
Joined: 2013-04-16, 05:32
Location: Australia

had a bit of a play with the system tonight.

I cant seem to find a motherboard manual for the PCCHIPS Cheetah 6.1 motherboard.

The M912 appears to be exactly the same but when I use the M912 manual and set jumpers for AMD 5x86 133 or Cyrix 5x86 100/120 the system either doesnt boot or with the cyrix 5x86 100 the post recognizes a Cyrix 5x86 66mhz

http://oldman.ixbt.com/mb/m912v17%20PC-Chips/jumpers.htm

does anyone know where I can get a manual for this board?

or alternatively what Cyrix or AMD 5x86 settings do you use on your jumpers for the M912?

=My Cyrix 5x86 systems : 120MHz vs 133MHz=. =My 486DX2-66MHz=

Reply 6 of 6, by BastlerMike

Posted on 2013-09-11, 16:35

BastlerMike Offline

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Posts: 234
Joined: 2010-10-11, 15:53

rgart wrote:

The M912 appears to be exactly the same but when I use the M912 manual and set jumpers for AMD 5x86 133 or Cyrix 5x86 100/120 the system either doesnt boot or with the cyrix 5x86 100 the post recognizes a Cyrix 5x86 66mhz

To my understanding JP31 should left open for 100 MHz operation when using Cyrix 5x86.

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