If you were following Joerg Hoppe's recent PC05 auction on eBay, you might have 
noticed that his system had an M705 in the backplane where I would have 
expected an M7050. This is the way he received it and the restored unit works 
as it should.

Clearly the cards are similar but different but are they interchangeable? Would 
the backplane wiring be different and if so where would this be recorded?

My copy of the PC04/05 maintenance manual (DEC-00-PCOA-D(1)) makes no mention 
of the M705 in this location. The PC04/05 print set on Bitsavers has the M705 
on the module utilization list (p45) but crossed out with no reference notes. 
There is an ECO list on the sheet, showing PC05 ECO's 3, 16 and 30 but no 
specifics. Is there an available ECO log that would cover these notes?

Then there's the K303, but that's another story...

Jack



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