majestyk wrote on 2023-04-20, 02:41:The mainboard is a FIC PSK-2000 - the cache stick is proprietary and also made by FIC . […]
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The mainboard is a FIC PSK-2000 - the cache stick is proprietary and also made by FIC .
I experimented with this board a lot and there´s a thread about it here at Vogons.
FIC PSK-2000 LPX Mainboard (AT&T Globalyst 630) proprietary hell
Datasheets about this chipset are virtually unavailable!
There´s a vacant place for a 2nd TAG chip on your cache stick. For an enlarged cache range the additional TAG lines be must wired to the MCH. I don´t know if this is the case here.
If the present TAG chip "M1" is 8Kx8 and if the Intel HX logic applies you would not only have to populate the second TAG chip (M2) but also make sure both are 16K x 8 or 32K x 8.
I actually read your thread a while ago. If you read my first post in this topic, you'll see me refer to the idea of installing a VRM for use with an MMX chip. I got that idea from you, although I've chosen to keep this system as stock as possible, sans the upgrade to 133 MHz from the original 90. This system's even got its original hard drive, a Caviar 31000 in perfect platter and bearing health.
For that reason, I've also decided not to alter what is already a clearly rare COASt module in a rare system with an even rarer chipset. If it's only got the 1 TAG chip, then I'll accept 64 MB as the max for this system for now. Perhaps if I come across a second AT&T COASt, I'll be a bit braver about altering one of them.
Also yeah, something tells me that the VLSI chipset wasn't really that widely adopted. That's especially considering how Intel was really starting to throw down the gauntlet in the chipset arena when they developed the Pentium. VLSI had a lot more spotlight in the 80s and very early 90s, I believe. There's no surprise that next to no documentation is available for the SuperCore 590, 30 years after its introduction.