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To: John Mansfield who wrote (9922)	1/30/1998 11:25:00 AM
From: John Mansfield	Respond to of 31646

'a PDP motherboard is typical of certain types of embedded system board' C.S.Y2K Roger Barnett; 1/29/1998: 'If I might just repeat my PDP-11 motherboard example: this board has a Time Of Year clock which is programmed via some board-level firmware there is a bug in this firmware, as a result of which the TOY clock is screwed after 29-Feb-2000 when a PDP with this bug hits some other failure or is rebooted for some other reason after that date, the firmware diagnostics will detect a screwed TOY clock and stop - i.e. the operating system will never get a look in at this point the PDP is unusable, and cannot be recovered without either replacing the entire motherboard or re-programming the TOY clock firmware note that whether or not the PDP ever uses this clock chip after power up is irrelevant take away most of the device interfaces and shrink it a bit and a PDP motherboard is typical of certain types of embedded system board - specifically those that were installed in the 1980s Note that this problem only affects certain PDP models - I am still trying to find a definitive statement of which ones, and also which particular clock chip is involved. ( anyone know whether PDPs are still used to control the ticketing & fare systems in London Underground stations ? :) ) -- Roger Barnett '