Found a 20mhz cube board.. but not as expected

Started by barcher174, July 09, 2019, 06:00:04 am

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barcher174

So I've been on the lookout for an early cube board at 20mhz. I located one, but not as I expected. This board is strange. Half of the components were dated to mid/late 1988 and the other half dated to 1989 with very distinct similarities in date codes between the 2 sets. Stranger still, the board itself has a 12/89 production date? Why the early components on a later board? The CPU looks factory wave soldered and if it was reworked it was a -very- good job. I wonder, did the owner ever notice the CPU was overclocked? Pics:








Rob Blessin Black Hole

OK that is weird , I'll have to take a closer look at some boards .... how did they over clock it?
Rob Blessin President computerpowwow ebay  sales@blackholeinc.com http://www.blackholeinc.com
303-741-9998 Serving the NeXT Community  since 2/9/93

barcher174

No magic on the overclocking, they just put a 20mhz part in a 25mhz circuit. It's definitely strange.