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Suddenly remembered I have an old repair manual. It lists many of the S-Specs for early Pentiums. My P75 chip has S-Spec SX969 and the "new" P133 has S-Spec SY022. As far as I can gather they are both compatible. ie single voltage, normal timing, 3.135- 3.6v chips. So it's clear to me that it's a jumper or cache problem. Reading through the S-Specs was an eyeopener. What a minefield for a repair man those old Pentiums were!! Some of the early P54 (<100MHz) even had 5v versions whereas P54c (=>100MHz) had both dual and single voltage versions. Getting the correct S=Spec chip was a neccessity. As I understand it there wasn't any particular date when an overall change to split voltage chips took place. Intel seems to have swung between both single and dual versions during the P54c series. On Monday 07 October 2002 12:43 am, Neil Stone wrote:
What speed did the P55c/p54c switch occour ? IE te single to dual voltage change... just an idea On Mon, 2002-10-07 at 02:27, Keith Abraham wrote:I've just upgraded from a P75 processor to a P133 on an old Tulip TC44 Level 2 motherboard. Problem is both the BIOS and the OS say it is a 60Mhz CPU. Yet the CPU is definitely a P133 and all the jumpers on the board are correctly set for the upgrade. I've even done a BIOS upgrade with no improvement. I note that there is space on the board for a 2nd level cache module. Perhaps this has to be filled in order that the processor operate at it's designated speed? Any help from you hardware experts would be much appreciated as I'm not familiar with these old processors. Keith -- SuSE 8.0 Linux on 700Mhz AMD Duron/PCChips 810LMR with 128MB RAM and 20GB Maxtor HD using KDE's Kmail -- The Mailing List for the Devon & Cornwall LUG Mail majordomo@xxxxxxxxxxxx with "unsubscribe list" in the message body to unsubscribe.
-- SuSE 8.0 Linux on 700Mhz AMD Duron/PCChips 810LMR with 128MB RAM and 20GB Maxtor HD using KDE's Kmail -- The Mailing List for the Devon & Cornwall LUG Mail majordomo@xxxxxxxxxxxx with "unsubscribe list" in the message body to unsubscribe.