🚀 go-pugleaf

In article <1992Aug21.094137.23@nsrvan.vanc.wa.us>, sysevm@nsrvan.vanc.wa.us writes:
|>
|>	I noticed upon opening up my VS3100/30 that the *only* changes between
|>it and the 'faster' VS3100/40 are the clock (66.6666 MHz vs 44.4444 MHz) and
|>a jumper. This is down to the chip part number.
|>
|>	The cost of the 66 MHz osc is about $10 so when I find one I'll give it
|>a try.
|>
Trust me, it won't work.


True, we use the same etch, and now the same CPU chips in the system, however
many of the other latches, cache rams, and other things that are tailored 
to a specific clock cylcle time are different.  (look on some of the cache
rams, you'll see different speed designations)

On top of that, the jumper changes the timing in the memory controller
circuitry and lots of internal stuff in the CVMTC (CVAX Memory and Timing
Controller) gate array.


--


William M. Jackson
Workstation Product Marketing Manager
Workstation Engineering
Digital Equipment Corporation
146 Main Street
Maynard, MA 01754

Mail:	Jackson@pravda.enet.dec.com