DTK 486VIP PKM-0039E BIOS and Jumpers Wanted

Posted on 2020-02-01, 00:32

by

by ph4nt0m

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Got this board recently from a scrap pile. All jumpers, the BIOS/Dallas/cache chips are gone. I can put these in place, but the manual with jumper settings is nowhere to be found. The BIOS image is also needed. The chipset is somewhat unusual EFAR EC802G cache and memory controller, EC100G ISA …

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Re: The World's Fastest 486

Posted on 2020-01-26, 12:15

by

by ph4nt0m

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

PCChips M912 aka Cheetah has a very thin PCB. Especially the last v1.7. The capacitors are no good either. The good thing is that it can handle 1Mb of cache and 40MHz FSB. ECS UM4980 is about the same with a much thicker PCB, but it doesn't come with a voltage regulator. Either you DIY or just use a …

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Re: The World's Fastest 486

Posted on 2020-01-19, 15:07

by

by ph4nt0m

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

3Dfx Voodoo Banshee works fine on the 66MHz PCI bus just like Voodoo 3, and there is no practical performance difference between these on 486. Another challenge is to get a 66MHz capable IDE or SCSI controller because the integrated one in SiS 496 is slow and somewhat buggy.

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Re: Only good browser for XP is MyPal

Posted on 2019-09-28, 22:53

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by ph4nt0m

in Marvin \ Software

in Marvin \ Software

All this thinking the linux needs a Zillion gigabytes of memory and a 64bit multi core processor is just horseshit. Jessie runs just fine on 256megs of ram. Windows Managers such as Window Maker, the Gnome 2 replacement MATE, XFCE4, ICEWM and a lot more run as fast as there equivalents did over 15 …

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Re: Only good browser for XP is MyPal

Posted on 2019-09-28, 22:43

by

by ph4nt0m

in Marvin \ Software

in Marvin \ Software

If a browser allows malware hidden in ads or other scripts, that's a problem in the browser, not the OS. Err... no. You don't seem to have any knowledge about how that works. Malware infection through a browser works by exploiting bugs in the OS. If the OS is not safe, NO application running on it …

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Re: Only good browser for XP is MyPal

Posted on 2019-09-28, 20:10

by

by ph4nt0m

in Marvin \ Software

in Marvin \ Software

No offence, but anyone accessing the Web with XP or older should be flogged. No matter which browser, that's just irresponsible. No offense, but this is just stupid, stupid FUD. They are actually trying to do you a favour by pointing out the obvious, this isn't someone being a killjoy, it is common …

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Re: IBM PS/1 investor ?

Posted on 2019-09-28, 18:48

by

by ph4nt0m

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Bah I envy you Americans! You get such cheap old school hardware showing up for peanuts while us Europeans have to shell out 3-4 times as much for similar hardware except it's a lot less likely to hit the market! Well, $255 for the tower + postage + sales tax isn't exactly cheap, but it's a very …

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Re: IBM PS/1 investor ?

Posted on 2019-09-28, 17:38

by

by ph4nt0m

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Bah I envy you Americans! You get such cheap old school hardware showing up for peanuts while us Europeans have to shell out 3-4 times as much for similar hardware except it's a lot less likely to hit the market! Well, $255 for the tower + postage + sales tax isn't exactly cheap, but it's a very …

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Re: Upgrading a 386SX - some advice!

Posted on 2019-09-01, 21:25

by

by ph4nt0m

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Have you cleaned the board well after soldering? What's displayed on your POST card?

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Re: Reason for additional capacitor on MB? (between CPUs)

Posted on 2019-08-18, 19:24

by

by ph4nt0m

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Maybe it interfered with some cooler designs.

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Re: 486 CACHE - Difference between WB And WT 486

Posted on 2019-08-18, 19:20

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by ph4nt0m

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Anonymous Coward wrote: As far as I know there is a 5V WB chip. I think it's Intel SX955. Cyrix (ST) also made DX2 5V WB: Cx486DX2-66GP ST486DX2-66GS Cx486DX2-80GP ST486DX2-80GS

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Re: Reason for additional capacitor on MB? (between CPUs)

Posted on 2019-08-18, 15:32

by

by ph4nt0m

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So what? I routinely solder capacitors to unpopulated places on mainboards. It never hurts and looks better this way.

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Re: 486 CACHE - Difference between WB And WT 486

Posted on 2019-08-18, 15:27

by

by ph4nt0m

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The actual difference depends on the L2 cache type and size, memory speed and, of course, on software running. If it doesn't fit well the L1 cache, it doesn't really matter if it's WB or WT. Nevertheless the L1 WT + L2 WB is also a good combination.

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Re: Newly made 4MB 30pin SIMMs

Posted on 2019-08-18, 15:20

by

by ph4nt0m

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The cache became important when CPUs started to run internally faster than system bus. Instruction latencies and throughput were also improved. Sure you can call async DRAM speeds effective, but those bus cycles are just to match and exceed internal latencies. So, if we have a 70ns FP memory with a …

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Re: Newly made 4MB 30pin SIMMs

Posted on 2019-08-17, 13:14

by

by ph4nt0m

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

70ns ram is really only good to 16mhz but can under certain circumstances run synchronized up to 25mhz No and no. You cannot calculate speeds for async RAM the same way you do for sync. Besides I used 70ns FP memory successfully with a Pentium OverDrive MMX running 66MHz system/memory bus using …

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Re: Newly made 4MB 30pin SIMMs

Posted on 2019-08-16, 11:46

by

by ph4nt0m

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

awesome :) I might get some maybe, the problem is I already have some ^^ ... just one question, and excuse my ignorance, what is the main use for these, do pre-386 even benefit from ram faster than 70ns? I'm asking because the 386 baord I'm planning to use right now already has 72-pin slots. Those …

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Re: Help identifying 386DX motherboard

Posted on 2019-08-16, 00:50

by

by ph4nt0m

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Mainboards of this kind with 22-pin tag chips support 64Kb of cache and 256Kb/1Mb SIMMs usually. It doesn't mean they are bad. The cache may work with better timings than 128Kb/256Kb on other boards. 16Mb of memory is still enough for most tasks.

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Re: Upgrading a 386SX - some advice!

Posted on 2019-08-15, 13:15

by

by ph4nt0m

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You can actually solder a 3.3V SLC in place of a 5V SX if you attach a heat sink. It's good up to 50MHz. Gets hot, but works fine.

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Re: Newly made 4MB 30pin SIMMs

Posted on 2019-08-15, 12:59

by

by ph4nt0m

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

quicknick wrote: How hard would it be to add parity? Are the 4Mx1 chips hard to find? You can disassemble one 4Mb 30-pin SIMM consisting of 8 (9) 4Mx1 chips.

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Re: Any way to run a Voodoo 5 with a Dual Core CPU

Posted on 2019-08-14, 07:01

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by ph4nt0m

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

From the engineering point of view, the primary difference between the AGP 1.0 (2x) and 2.0 (4x/2x) in the compatibility area is the former makes use of 3.3V signalling with the reference voltage (Vref) provided by the mainboard while the latter requires 1.5V signalling with Vref provided by both …

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