Re: Do I have a cache problem or not? New board with Cx5x86.
Posted on 2024-02-11, 23:58
Same combination of "cache" and "tag" chips: https://youtu.be/NWUtn0mslgo?t=742 😁
Re: This motherboard—can someone identify it?
Posted on 2024-02-03, 22:27
alexparr wrote on 2024-02-01, 23:18: ...I found another Jetway motherboard... Did your board come with a CPU and if so, which one? I'm interested in the jumper settings, because I got an identical one that came without CPU and I'm unable to make it perform at least half-decent with the few CPUs …
Re: AthlonXP Resistor array replacement
Posted on 2024-01-17, 19:58
I've stumbled across this problem over the years, I remember one Barton core having a strange amount of L2 cache (64 or 128K) and thus being recognized as "Unknown CPU" due to a broken resistor network. The Mouser part seems to be just right, but I always recovered the part from one of the …
Re: Seeking advice on reviving this Voodoo 3
Posted on 2023-12-03, 13:36
Check all the inductors near the VGA port. If you have a scope, check for signals on the R, G, B and H/V-sync pins.
Re: Asus V7700 broken transistor
Posted on 2023-10-10, 22:29
I have three such cards. On two of them Q805 is marked p04 (lowercase p), the third one has a K1N instead. Good luck on restoring your card!
Re: Original IBM EGA card repair thread
Posted on 2023-05-19, 07:53
One PCB trace on the back (behind U21) looks suspicious, test it for continuity. There are also some other scratches but those don't seem too bad.
Re: What motherboard do I have?
Posted on 2023-05-18, 22:43
Cache chips in bank 0 are inserted wrong, I think.
Re: Lucky Star 5I-VX2B video cards problems
Posted on 2023-05-04, 20:59
Are the Trident and Alicat confirmed working on another motherboard? Have you tried cleaning the connectors, pushing down the socketed chips (if any)? On the CL card there seems to be a problem with the green signal. Carefully check it for any missing or damaged parts. Maybe upload some close-up …
Re: P100 Hanging at "Updating ESCD"
Posted on 2023-01-27, 11:07
Just an idea, maybe you already did it the "right" way, but don't just copy the old chip, use instead a clean image downloaded from the net. I once had a board that got stuck at "Verifying DMI data pool..." because of a flash chip gone bad, and a 1:1 copy on a fresh chip behaved exactly the same. …
Re: BIOS corrupting itself
Posted on 2022-12-21, 23:47
Just an idea. BIOSes around that time started to store data (ESCD, DMI) inside the flash chip. Maybe the corruption happens because it tries to write something but it fails because of "Unknown flash type". Also (and I might be very wrong here), couldn't this "dual bios" be implemented by using two …
Re: Video card only displays red? (not defective VGA port) (Colorimage 59-6693-0007 Tseng ET4000AX 1MB)
Posted on 2022-11-01, 23:57
L4 and L5 (close to the VGA connector) really seem to be missing 😀
Re: Help with Octek Fox M 286 (broken chip)
Posted on 2022-10-26, 08:19
Heh, I'm sure it's easy for you but for me this is some kind of wizardry. Maybe I could have solved it by only focusing on this problem for 5 years straight :D I'm also sure that REDLED's dump is accurate, but it's more of a truth table for the chip, and how to get from that to the needed .JED file …
Re: What to do about a Socket 462/A motherboard with a broken socket?
Posted on 2022-10-25, 21:50
How was the old cooler attached? Using the mounting holes around the socket? If you still have it (and the mounting hardware) is it possible maybe to exchange the fan for a modern/silent one? Also, there are plenty of Socket A coolers that engage all three hooks on both sides. If you don't go for a …
Re: Another 486 no-POST
Posted on 2022-10-25, 21:44
Fiddled a little with the oscilloscope around the board today. Noticed that after some resets there was activity on the EPROM data/address lines, all except A2. Traced the signal to a nearby LS245, then to another one, then it split three ways: A2 pin on the CPU, pin 92 on the chipset and some pin …
Re: Help with Octek Fox M 286 (broken chip)
Posted on 2022-10-25, 18:18
Having something brought to life after almost 5 years feels great, and that's one of the reasons I love this community 😀 Thanks for your reverse-engineering effort crackintosh.
Re: Super Socket 7 Lucky Star 5MMVP4 onboard VGA is VERY dim
Posted on 2022-10-23, 09:09
The image is there, so I guess there's no problem with H and Vsync. You mentioned inductors having high resistance of up to 2kohms when measuring across them, on resistance mode? They're definitely broken, normal DC resistance for those should be around 0.5ohm. I had a motherboard that had a bunch …
Re: Help with Octek Fox M 286 (broken chip)
Posted on 2022-10-23, 08:41
That's great, thank you guys! I'm away at the moment, but can't wait to burn the code into an ATF and revive my board! @REDLED, I'll have to read into this "Retro Chip Tester Professional", and also I find it interesting that your board lacks the third PAL (the one behind the ISA slots), and one of …
Re: Sad Voodoo 3
Posted on 2022-10-17, 23:01
Thank you all for your input. Not particularly proud of how this turned out, but I had to quickly check if the card is at least a bit alive so pentiumspeed 's method was out of the question (mainly because I'm lacking the high-temp epoxy and the experience :D ) 20221018_003801r.jpg At the initial …
Sad Voodoo 3
Posted on 2022-10-15, 21:57
Got this Voodoo 3 from today's flea market, but when I got home it turned out that the green spots that looked like corrosion were really corrosion :| They even reacted (bubbled) when I bathed the card in vinegar, so who knows, maybe the card was stored together with some leaky 286 boards or …
Re: Help with Octek Fox M 286 (broken chip)
Posted on 2022-10-14, 10:54
That's great, congrats! Does this mean you finally cracked the code inside 089-001 and you have a working board? If so, can you please share the JED file? Thank you.
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