hdd replacment - sd card, cf card or scsi

Posted on Today, 20:05

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by Robhalfordfan

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

hello all i been working on 486 build (using a different motherboard for now, till i can get old one working again) i have noticed there is bottle neck somewhere (not within dos itself but in windows 3.11) the hdd that came with pc is old seagate 3000rpm -ish ide hdd and it does work but i was …

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Re: external l2 cache issue - 486 socket 3 mobo

Posted on 2020-11-18, 16:58

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by Robhalfordfan

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

i am trying look for pin compatible option on my programmer to read the cache chip and i have no idea which would be pin compatible and same memory size the programe i am using is one that came with programmer which xgpro

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Re: external l2 cache issue - 486 socket 3 mobo

Posted on 2020-11-02, 18:52

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by Robhalfordfan

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

i actually do not have that option in the software and searched for model with all and sram/nvram option it doesn't appear There's definitely an option compatible with those chips somewhere. You can use any 256kbit chip with a compatible pinout ok, will try at some point - giving myself a break …

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Re: external l2 cache issue - 486 socket 3 mobo

Posted on 2020-10-31, 13:08

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by Robhalfordfan

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

i didn't know that - what would the chip type be there as i have selcet the ic type before reading the chip Manufacturer: "Standard SRAM", Model: "62256" (For the usual 256kBit chips, where 8 of them yield 256KByte L2 cache), at least that's how it's printed in the "supported devices list". i …

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Re: external l2 cache issue - 486 socket 3 mobo

Posted on 2020-10-29, 18:10

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by Robhalfordfan

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I wouldn't mess with ORI_BIOS. It's corrupt. I'm almost certain that the 4umw002.bin bios you found is what you had originally. Your TL-866 II can test SRAM chips, by the way. I don't think it's thorough enough to tell whether a chip is slower than advertise, but it can identify if one is dead. i …

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Re: external l2 cache issue - 486 socket 3 mobo

Posted on 2020-10-28, 14:34

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by Robhalfordfan

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I thought the original backup was maybe it did get corrupted while backing up How did you dump the backup? The good news for troubleshooting is I'm pretty sure it is just a corrupted version of the V3.20 bios you posted. The compressed original.tmp is stored in the first 0xff49 bytes; only a few …

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Re: external l2 cache issue - 486 socket 3 mobo

Posted on 2020-10-28, 14:26

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by Robhalfordfan

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

my flash rom arrived and flash the bios from the weblink above which is v3.20 and with l2 cache on it gets past updating escd... and starting booting from hdd or a floppy disk and say starting ms-dos and then nothing but again turning off l2 cache altogether works fine changing the l2 cache to …

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Re: external l2 cache issue - 486 socket 3 mobo

Posted on 2020-10-28, 14:21

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by Robhalfordfan

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

debs3759 wrote on 2020-10-28, 00:34: Any sram chip with the same specs would work. ok thank you, was not sure if some were compatible and some was not

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Re: external l2 cache issue - 486 socket 3 mobo

Posted on 2020-10-27, 23:48

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by Robhalfordfan

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Maybe a simple way to compare Bios's is to generate a hash via the crc/sha functionality that comes with 7zip - right click after install and you can generate "hash" keys from files. Maybe one of your srams is defect... you may need a second set for testing. i have no idea how to do that and could …

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Re: external l2 cache issue - 486 socket 3 mobo

Posted on 2020-10-26, 18:13

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by Robhalfordfan

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

my flash rom arrived and flash the bios from the weblink above which is v3.20 and with l2 cache on it gets past updating escd... and starting booting from hdd or a floppy disk and say starting ms-dos and then nothing but again turning off l2 cache altogether works fine changing the l2 cache to write …

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Re: external l2 cache issue - 486 socket 3 mobo

Posted on 2020-10-25, 21:15

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by Robhalfordfan

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Return to the old BIOS and try the configuration, no cache + DX4, to see if the instability issue persists. Also the new / different BIOS may not be fully compatible - I had a similar issue with a P60 board where a "compatible" BIOS version would screw up everything. Getting new cache chips is …

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Re: external l2 cache issue - 486 socket 3 mobo

Posted on 2020-10-24, 11:25

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by Robhalfordfan

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Couple things: Your cache cannot go bad just because you flashed the BIOS. It looks correct for 256K using 4 chip+TAG. TRY: Set the L2 Cache Update Scheme to WR-Through like L1 is and see what happens. ( I can see that is the other choice in the new BIOS) Ok I cannot extract the "original.tmp" from …

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Re: external l2 cache issue - 486 socket 3 mobo

Posted on 2020-10-24, 11:20

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by Robhalfordfan

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Can you remember whether the original BIOS had that "Plug and Play BIOS Extension"? PnP BIOS and ESCD are intertwined, and I believe ESCD requires a flash BIOS. So that may be related since we thought your board isn't capable of flashing a BIOS. I think it did have plug and play bios extension, …

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Re: external l2 cache issue - 486 socket 3 mobo

Posted on 2020-10-23, 21:56

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by Robhalfordfan

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

been looking for my original bios just in case if my backup is screw in some way and found this and it seen to be closer or was my original bios http://chukaev.ru54.com/bios_en.htm#z3zzm002:~:text=%3D%3D%3D%3D%204umw002.zip%20%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D% …

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Re: external l2 cache issue - 486 socket 3 mobo

Posted on 2020-10-23, 19:56

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by Robhalfordfan

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

What BIOS version did you come from and go to? Are you sure the BIOS you upgraded to is not for a different revision of the motherboard? Are the cache jumpers set properly? the cache jumper set when i got the mobo original and worked before and haven't changed anything there i can't remember what …

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Re: external l2 cache issue - 486 socket 3 mobo

Posted on 2020-10-23, 19:23

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by Robhalfordfan

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

When you flash a BIOS, settings can be restored to defaults. The -15 in the name can mean 15ns, go through the BIOS and see if there is anywhere to set that. It also looks like you have 256KB of cache as you have 4x512Kb and the 256Kb may be a parity chip. had a look and defaulted the bios and can …

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external l2 cache issue - 486 socket 3 mobo

Posted on 2020-10-23, 18:59

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by Robhalfordfan

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

hello all after updating the bios in my 486 build the system hangs on updating escd and the keyboard stops working or freezes i have discovered - it doesn't hang if disable the external l2 cache in bios or take out the chips the l2 cache worked fine before the bios update which is on an eprom ( …

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Re: Old pc case ports covers

Posted on 2020-10-23, 10:25

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by Robhalfordfan

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You could always get a something 3D printed? https://www.thingiverse.com/thing:952092 (not exactly what you're after, but gives a good idea) that did cross my mind but unfortunately, i have no idea how to design for 3d printing or someone who could or owns a 3d printer but still nae a bad idea …

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Re: blank socket bios flash help

Posted on 2020-10-22, 11:49

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by Robhalfordfan

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

which chip should i be looking for as i have no idea what to be looking out for I think the linked chip would work. The important things are that it's 32 pins and the right capacity (1 megabit or 128 kilobytes in your case). I use SST 39SF010A as they are only $1.24 apiece from DigiKey rather than …

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Re: blank socket bios flash help

Posted on 2020-10-19, 16:17

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by Robhalfordfan

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

At this point I'd just go buy an EEPROM. It's less hassle overall. will an eeprom work in place of an eprom i noticed on the mobo this eprom came out of has a jumper for eprom (set by default) or flash rom which is more easy to get and restore original bios back on it which chip should i be looking …

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