This is mine Skip

Am I the only one who owns one of these? If you have one, could you at least share a photo of yours so I can see what the DIP switch settings are? I received a 286 motherboard today that has one of these installed, but I'm afraid I know absolutely nothing about it. I can take a pic of the current …

Hi all As part of a job lot I bought today (2x486 pc's, and a 286 motherboard) was this Gateway 2000 branded CRT, made by Tatung, model no CM-1495. 20210117_150459.jpg 20210117_150459.jpg I'm a little unsure what video inputs it supports though. It has a regular 9 pin D sub plug on it and a switch …

Just an update. I have found what appears to be a new bios version, although it doesn't mention which revision board it is for. Flashing BIOSes has always made me nervous, so I have ordered an EPROM programmer and a spare chip of the correct type. I'm going to make sure I can make a backup of the …

Well I have finally sorted this. I sat in a box of bits until I pulled it out a few days ago to test if another socket 7 processor posted. I just happened to find a setting in the BIOS to disable the motherboard cache and as soon as I had done this, it stated working just fine. Re enabling the cache …

That all said, not too much point if I can't get it to work with anything more than a 166MHz MMX! Andrew

Ahhh, sorry, I had meant to include that, Its a "TIP122" Nope, I can't find anything on the jumpers either sadly! Andrew Yep, that's a Darlington alright. This could be... interesting. I don't like the sound of that!!! I'll pull it back out some time, probably when my new IDE and floppy cables …

Ahhh, sorry, I had meant to include that, Its a "TIP122" Nope, I can't find anything on the jumpers either sadly! Andrew

Wow, now that's odd. I have three possible explanations why your MB still doesn't POST when P55C is set to 200MHz. 1. Power delivery is still not sufficient, measure Vcc core as close as possible to the socket when MMX CPU is installed and voltage is set as single rail, perhaps it drops under load? …

The voltage regulator almost certainly isn't fixed to 2.5V, it just has a reference input determined by a resistor between Vio and the VRM. Put a smaller resistor on there and you get a higher voltage. Exactly which resistor and which voltage depends on the VRM model. If you could share it with us …

I've had a poke around with a multimeter and now I'm completely confused as to why it won't work. This is what I've found. Pin BF0 on the CPU is connected to one of the pins of jumper 2 - 0Ω. The other side of JP2 is connected to ground - 100Ω With a non MMX Pentium in there and no jumper fitted at …

I've had a poke around with a multimeter and now I'm completely confused as to why it won't work. This is what I've found. Pin BF0 on the CPU is connected to one of the pins of jumper 2 - 0Ω. The other side of JP2 is connected to ground - 100Ω With a non MMX Pentium in there and no jumper fitted at …

Well, that was unsuccessful... I made up a lead with a 1K resistor in, but as soon as JP2, which seems to be connected to BF0 on the processor, is pulled high, it refuses to post... More head scratching required. Andrew

This is a common but very old issue A single rail motherboard (one that does not have separate VIO/Vcore) Lacks the ability to properly set jumpers causing them to float on split rail CPUs) To set a jumper you need to be able to bring the multiplier pins high or to ground, To fix you will need to …

Hi all, fairly new here, but recently got back into tinkering with old PC's after a bit of a break. A friend of mine gave me one of his old computers, that he still had sat in the loft. Its a Pentium 166 system, came to me with 40MB of RAM, originally 8MB. 1.2GB Seagate drive with a really messy …

Hi all, new here, so hope its ok to start with a question. I had a look if there was somewhere for introductions, but couldn't find, so here goes. I picked up a couple of older PC's off of Facebook marketplace back in Jan or Feb, as I simply have a fascination with tinkering with old hardware. There …