Reply 60 of 60, by rasz_pl
rasz_pl
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Perhaps new custom early Local Bus variant Re: UMC480 Chipset 486 Motherboard: Reset problem, can you help?
Uses reverse ISA slot, doenst match any already mentioned implementations, not listed by Theretroweb.
Only markings "486 LOCAL BUS ver1.0" and "LOCAL BUS SLOT"
UMC UM82C482, 16x 30pin Simms, 256KB of relatively slow 25ns L2 cache.
Latest datecode on soldered chip 92 week 11 = March 1992
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