Re: Amibios socket 3 486 broken cmos battery blues
Posted on 2023-12-09, 15:55
I AM curious but not enough to play with it more now that it's working 😁 .. I've secured the wiring and called it solved. Thanks for your help.
Re: Short on ISA slots? Try this.
Posted on 2023-12-09, 03:17
So I tried this, and first attempts didn't work - though to be fair I'm only trying this on an 8-bit ISA extension. I moved the ISA USB card from the XT to the expansion chassis, and put together the bridge of cables and cards. I get power as the usb stick lights up, but no data. continuity seems …
Re: Gotek woes (32KB) - anyone else?
Posted on 2023-12-05, 03:26
I've bought 3 flashfloppy gotek drives from a seller on ebay in the last couple months and all three are running just fine - 1 on an 8088, 1 on a 486, and 1 on a pentium II. I also before that bought an artery model on amazon and wound up coastering it trying to upgrade it to flashfloppy. So my …
Re: Ask for help, AMI BIOS strange beep code
Posted on 2023-12-05, 03:11
I don't suppose your cmos battery is dying? If you unplug it from power for a little while do you lose your bios settings?
Re: Amibios socket 3 486 broken cmos battery blues
Posted on 2023-12-04, 15:18
So a followup, and good news. I wasn't satisfied with the CMOS jumper connection being unknown so I tested continuity between each of its two pins and the positive pads of the onboard battery, and got a positive from one of them. So, I hooked the external battery + to that pin, and the external …
Re: Amibios socket 3 486 broken cmos battery blues
Posted on 2023-12-03, 17:02
As good a guess as any but it doesn't help me get the external battery working. I might just see if I can get away with soldering a post in the + of one the on board battery pads, then connect the external battey + to it like I tested. Plus would make it easier to rig a modification to the circuit …
Re: Amibios socket 3 486 broken cmos battery blues
Posted on 2023-12-02, 22:59
This whole thing is strange! :D On 5, I used a probe to connect the battery negative to one of the negative pins on the external battery header because it was convenient, it has connectivity to negative on both of the on-board battery pad locations so it didn't matter if I put it there or the pads, …
Re: Amibios socket 3 486 broken cmos battery blues
Posted on 2023-12-02, 20:34
Thanks for taking the time to look this up. I looked around your diagrams and the thread, and I don't think that they apply to my board. the reason is I have a separate 2 pin header for CMOS clearing: open for normal, closed to reset it. it's nestled between a couple of the ISA slots, which is about …
Re: Amibios socket 3 486 broken cmos battery blues
Posted on 2023-12-02, 17:18
I got the actual backup battery in and ran all these tests: 1) backup battery plugged in the 4-pin header: fail (repeat buzz no bios boot) 2) jumper 2-3 on the 4-pin header, pos and neg in 1 and 4: fail 3) reverse pos and neg from battery to header, just in case board is mislabelled: fail 4) try …
Re: Amibios socket 3 486 broken cmos battery blues
Posted on 2023-12-01, 21:37
Awesome, thanks! As I said, I did continuity testing on the external and battery locations. The 4-pin external connector's negative pins (3 & 4) have continuity to the negative pads of both battery locations. Pin 2 has no connectivity to anything I can find. and Pin 1, the positive pin, has …
Re: Amibios socket 3 486 broken cmos battery blues
Posted on 2023-12-01, 17:36
I've tried a couple of jury-rigged batteries to the external battery connector with no luck, let's hope the actual battery that I ordered will do the job instead. I traced out the battery circuitry, the positive pin on the external battery connector leads to one of 3 connections of what looks like a …
Re: Amibios socket 3 486 broken cmos battery blues
Posted on 2023-11-28, 23:01
On the chance that the buzzes are, despite them sounding different, from memory having an issue that just happens to coincide with the cmos battery incident - the SIMMS are right next to where the CMOS battery is, and long beeps are usually signs of a RAM issue - I pulled all the SIMMs, cleaned …
Re: Have you seen this motherboard?
Posted on 2023-11-28, 19:57
Sadly I managed to kill this machine, I think, but I explained that in the other thread about the cmos battery. 🙁
Amibios socket 3 486 broken cmos battery blues
Posted on 2023-11-28, 13:55
So.. I done messed up. I was working on the Acer-mobo 486 yesterday, and it had a small coin battery (dime sized, not nickel sized like usual) in a vertical holder, which was already loose. I went to either pull it or at least see how it was connected and either it was REALLY lose or I am way too …
Re: Have you seen this motherboard?
Posted on 2023-11-27, 19:21
You're awesome! Yes, the BIOS string matches. I'm not too unhappy I can't use the Cyrix, it was only a couple bucks when I got it. Thanks for the search tips too, I'll note that for the future. Interestingly, the "do not touch factory only" jumpers are not set in the way that the documentation says …
Re: SBVGM (DOS) VGM Player
Posted on 2023-11-27, 14:52
Thank you. I'm pretty sure I'm on the same page now. I'm getting back into this after years and while I built my own PC's in the past, that was a while ago. I've been reading on different websites about this and this has been the most straightforward description. Appreciate the help and patience …
Have you seen this motherboard?
Posted on 2023-11-27, 14:48
Hi! I recently picked up a customized 486-33DX PC that was built by a local company that no longer exists. I'm trying to find information about it but so far have had zero luck. It has only one place on the motherboard with what looks like a model number on it - 92118-4 - and in the corner it has an …
Re: SBVGM (DOS) VGM Player
Posted on 2023-11-16, 00:47
I see, mostly, except I don't get any sound from them using -sbc. At best it appears to run, but no sound comes out, most of the time (or garbage once on that particular VGZ that locked the SB16 into a hanging note) - I've actually let it run tho no sound is coming out and the file ends in the time …
Re: SBVGM (DOS) VGM Player
Posted on 2023-11-15, 14:19
Sure, be happy to, and sorry I've been slow responding, I'm quite ill this week. No rush here as its a hobby thing, I am sure I'm just doing something wrong, but I am learning a lot too thanks! Defcrown.vgz is one that 'plays' - leaving a hanging note I have to boot the machine to fix - on the 486 …
Re: Short on ISA slots? Try this.
Posted on 2023-11-14, 15:58
A note on this project: you can also buy the ribbon cables pre-assembled on ebay, among other places: https://www.ebay.com/itm/256155811017?var=556131378353 The pin assemblies are on ebay (and amazon and others) too. I'm going to try this solution out. I only had to order the cards from OSH Park and …
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