Re: Info about Acer Acros PZ25D

Posted on 2019-08-28, 21:36

by

by flakes

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi croton64 Thanks for the Photos. is there any chance you can take a photo of the connectors on the other end of the Black Keyboard Lead, It will help me work the Pin-out for that connector. I managed to get mine to boot past that initial screen shown by having a working Floppy drive attached, But …

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Re: Info about Acer Acros PZ25D

Posted on 2019-08-25, 22:58

by

by flakes

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I know this is an old post but... I have one of these motherboards given to me and i decided to test my wash technique on it. It still works but i dont have the pinout for the White Keyboard connector or FP LED that are just below the L2 cache sockets. Can Anyone help! Also the setup utility would …

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Re: 486 VLB Identification / Information

Posted on 2019-08-15, 23:09

by

by flakes

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Its at ~3.8 Im using 3 x AA's with 2 Diodes creating a ~0.6v drop.

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Re: 486 VLB Identification / Information

Posted on 2019-08-15, 22:52

by

by flakes

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi Again Any one out there with any more information on this board? I have it in a case now, Sometimes the RTC stops (Looses time randomly when off). I have an external battery pack attached and it keeps all other settings but over a week of no use its droped about 2hrs and i have caught it not …

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Re: Intel 486dx4-100 overdrive running @ 75mhz ?

Posted on 2019-08-13, 02:40

by

by flakes

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Without a manual so, What do J51 and J24 do? J51 looks clost to the cache but J24 is near the cpu seletion of J25 and J31. I

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Re: New 486 PC- External L2 Cache

Posted on 2019-08-10, 03:24

by

by flakes

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi You will definitely need Tag chip in Location 5. The jumpers may be set fine (0 or 128k) if you are only using 128K. If you were buying more to get a Tag ram, you may as well populate the 2nd row and set the jumpers according to the table for J16 and J17.

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Re: New 486 PC- External L2 Cache

Posted on 2019-08-09, 01:13

by

by flakes

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If you can more of that photo would actually help us help you. all the information is probably on it.

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486 VLB Identification / Information

Posted on 2019-08-07, 23:05

by

by flakes

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi All Getting stumped with this motherboard. Its got Real Cache!, 3 VLB sockets, UMC Chipset. Manufactured by SUK JUNG ELEC. CO., LTD Model No SJ-486-3VL-2 I am trying to find any more info on the Jumpers. The board as shown in the photos was running a DX33 so i dropped my DX2 66ODPR in and it all …

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Re: BIOS image collection - requests, discussion etc

Posted on 2019-07-25, 01:02

by

by flakes

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Is there any chance the Test / Diag BIOS(s) can also be added to the listings? I know a few exist but not in an easy to reach area like the other BIOS you have listed.

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Re: Pentium II Upgrade Problems

Posted on 2019-07-20, 22:00

by

by flakes

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi You havent by mistake got one of the first P3 450MHz chips? if so they are a bit different and the bios may be upset. I had this issue when going from a P2 400 to P3 550. Board had issues like this until i found a BIOS update. (HP oem version of an ASUS board). After the BIOS it took an 800MHz on …

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Re: My Unfortunate 486 Build

Posted on 2019-07-14, 06:04

by

by flakes

in Marvin \ System Specs

in Marvin \ System Specs

The way i now look at VLB is the same as the 820 chipset with RD Ram (Rambus) for P3, Sure it was quicker than the 810/815 with PC133 SD-Ram but not many people had it because it was expensive.

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Re: My Unfortunate 486 Build

Posted on 2019-07-13, 23:20

by

by flakes

in Marvin \ System Specs

in Marvin \ System Specs

Not too sure on your dates there. We (Here in semi rural Australia) had 486sx25 and the like around 90ish because that's when the school i went to got them. They were all running dos win3, had about 4meg ram and something like a 150MB HDD. Trident VGA and network cards. They were not much but it was …

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Re: My Unfortunate 486 Build

Posted on 2019-07-12, 22:31

by

by flakes

in Marvin \ System Specs

in Marvin \ System Specs

VLB and PCI are a nice feature of the end of line 486's. I never had that type of setup as a teenager. It was all ISA. I have a P233 that is PCI and gives me the speed i need for the games i want to run on it. I want an early 90's (before 93) build that was typical of the mid range out there with …

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Re: My Unfortunate 486 Build

Posted on 2019-07-12, 13:23

by

by flakes

in Marvin \ System Specs

in Marvin \ System Specs

Interested to know how you go. I picked up another board tonight that has 256KB cache so will give it a go. I definitely need to find a VGA that is better spec than the one i have.

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Re: My Unfortunate 486 Build

Posted on 2019-07-12, 06:04

by

by flakes

in Marvin \ System Specs

in Marvin \ System Specs

I will see if anything turns up tonight at the retro Computer group here in adelaide... Might shelve it for a while.

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Re: My Unfortunate 486 Build

Posted on 2019-07-11, 08:43

by

by flakes

in Marvin \ System Specs

in Marvin \ System Specs

Hi. Yep that's what its looking like. Pity I paid for the board. not too much but enough to make me annoyed a bit. Might put it up for sale as i have a 286 and 386 on the way. Anyone selling a VLB or PCI with real Cache 😀

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Re: My Unfortunate 486 Build

Posted on 2019-07-11, 05:17

by

by flakes

in Marvin \ System Specs

in Marvin \ System Specs

hmm... Plot thickens... What would be the cache chips? all i can identify are the 74 series Hex inverters, buffers, NANDs, Octal Buffer & Line drivers, Like listed below... OPTi F82C206L - Integrated Peripheral Controller OPTi 82C496 - DXBB PC/AT Chipset 74SLS04N - HEX inverter MC74F00N - QUAD 2- …

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Re: My Unfortunate 486 Build

Posted on 2019-07-11, 04:25

by

by flakes

in Marvin \ System Specs

in Marvin \ System Specs

Hi Yep from Southern Adelaide. The BIOS is socketed. I made a dump of the BIOS and its in the 486 BIOS Part of the Forums. I cant trace (or havent been bothered to) trace the lines from the cache modules. Suspect they will go around in circles like many before. Might put some time in to it as 486 …

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My Unfortunate 486 Build

Posted on 2019-07-11, 01:36

by

by flakes

in Marvin \ System Specs

in Marvin \ System Specs

Hi So I decided I wanted a 486 like I had as a teenager. My requirements were for a simple setup 486DX2 ~66MHz 4-8MB ram, SB16, 1GB HDD and Network. I thought it would be easy to find the parts as who would want them these days! This led me to look on the net and find this site amongst other …

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Re: 80486 BIOS image collection

Posted on 2019-07-09, 09:45

by

by flakes

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

#44 OCEAN INFORMATION SYSTEMS, INC. HAWK 486 AMIBIOS Filename HAWK.zip File size 38.76 KiB Downloads 121 downloads File comment BIOS Image No Cache design Feature??? https://stason.org/TULARC/pc/motherboards/O/O … 6-HAWK-486.html Filename HAWK.jpg File size 1.17 MiB Views 3135 views File comment …

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