First post, by Bobbi
I have been meaning to write a post about my little 486. While I have been a retro computing enthusiast for many years, I was focused on 8-bitters, and didn't have any old PCs. Back in September or so I spotted a mini tower case lurking in the garbage room of my apartment building. I immediately spotted it had a 3.5" and a 5.25" drive, and a turbo button, so I knew it was old enough to be of interest!
Opening it up revealed a 486DX-33 with 4MB in 30 pin SIMMs and 128KB of cache on a GMB-486UNP mainboard (UniChip chipset, 7 ISA slots, 3 with VLB.) There was also a Cirrus Logic CLB-5426 graphics card (VLB) and a Goldstar Multi-IO card (16 bit ISA). There were both 5.25" and 3.5" floppies but no HDD.
In my initial testing I got a POST beep code indicating the keyboard controller was bad. Inspecting the board confirmed battery damage in the area of the AT keyboard connector (although the battery had already been removed.) I attempted a repair, but it was beyond my soldering skills to reconstruct the two broken tracks under the battery. I put the board aside for another day.
However the 486 kept calling me, so I ended up buying the cheapest decent-looking VLB 486 mainboard I could find on eBay, which was $60 plus shipping (from Kyiv of all places). This board was a MV035 (Opti 82C959A/82C602 chipset, 8 ISA slots, 3 VLB, Amibios.) It came with a 486-33SX and 8 MB in two 4MB 72 pin SIMMs.
This second board worked like a charm, so I put the 486DX-33 on it and focused on trying to get some sort of mass storage working. My initial plan was to re-use a dual CF card adapator I had from one of my Apple IIs. However I had no luck whatsoever with the CF adaptor. Whenever it was connected to the IDE, I would get POST errors relating to HDD and FDD Controller Failure. With the help of the fine folks here, I concluded that the problem was that many CF adaptors ground pin 28 of the IDE, which on old systems like this is directly connected to the ISA buse ALE line. I plan to return to this later and try an IDE cable with pin28 severed and see if it works. My next idea was to try an IDE-SATA converter, but this also failed to work, probably because these only work properly on systems which use UDMA.
Finally I realized I have a semi-broken Pentium II laptop lying around, and grabbed the 2.5" PATA drive from it. With an adaptor, this 6GB IBM drive works fine on the 486. The Amibios supports LBA (28 I am guessing) so I can use the full 6GB.
I installed MSDOS 6.22, and also Slackware 3.3 (2.0.x kernel, 1997 distro) and 8.1 (2.4.18 kerne, 2003 distro). And I have made a few upgrades over the last month, as follows:
1) Linksys NE2000 compatible 10baseT network card. NOS from Ebay.
2) Aztech AZT2320 sound card (HP-branded 'wedge' style card). Also Ebay.
3) 32MB of 60ns FPM RAM (2 x 16MB 72 pin SIMMs). Ebay vendor Memgate.
4) Brand new (!) PS/2 102 key model M from Unicomp.
5) Kensington serial mouse. A generous gift!
The system is rocking Slackware 8.1 right now (I am writing this in Emacs), and is a fully-fledged citizen on my LAN with SMB, NFS, SSH, FTP, Telnet, printing etc. working very well! I am able to browse the modern web using the 'WRP' web proxy on my Pi 4.
For now I am pretty satisfied with it, but I may end up throwing DX4 or AMD 5x86 or something in it to make launching Mozilla 1.0 a bit faster 😉
Curious if anyone else here is into running old Linux distros on old hardware, or am I the only such weirdo?
[And yes, this was written in Emacs on the 486]