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What retro activity did you get up to today?

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Reply 32020 of 32023, by PD2JK

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It looks like I bricked my Kayak XU800 board. BIOS crisis recovery doesn't work either. There is no floppy activity. The BIOS chip is not socketed unfortunately, and I don't want to place an empty socket on the board with the risk of ruining the whole thing. So I figured I could hook up an empty socket in mirror-image. Test drive using a spare EEPROM:

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Only a few pins left who are making bad or no contact... I slightly bent the contact points in the socket using a modified staple.

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Last edited by PD2JK on 2026-10-26, 19:43. Edited 1 time in total.

has all kinds of stuff

Reply 32021 of 32023, by BitWrangler

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Sometimes you need to cut the bottom out for sockets to seat deep enough to make contact when on top of a chip.

Unicorn herding operations are proceeding, but all the totes of hens teeth and barrels of rocking horse poop give them plenty of hiding spots.

Reply 32022 of 32023, by PD2JK

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BitWrangler wrote on 56 minutes ago:

Sometimes you need to cut the bottom out for sockets to seat deep enough to make contact when on top of a chip.

I see what you mean, but here's our brick:

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Not many tall components, just a few low profile SMD caps or resistors but these are not obstructing.

has all kinds of stuff

Reply 32023 of 32023, by rasz_pl

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I had mixed luck flashing chips while still in system, stuff like whole mobo trying to power off injected voltage etc, sometimes powering on and keeping it in reset helps

https://github.com/raszpl/sigrok-disk FM/MFM/RLL decoder
https://github.com/raszpl/FIC-486-GAC-2-Cache-Module (AT&T Globalyst)
https://github.com/raszpl/386RC-16 ram board
https://github.com/raszpl/Zenith_ZBIOS Zenith Z-386 MFM-300 ZBIOS disassembly