7 Jun
2005
7 Jun
'05
11:30 a.m.
>>>> "John" == John Allain
<allain at panix.com> writes:
> Boards for Omnibus, Unibus, Q-bus, etc are all
built to the same
> basic dimensions, so you cazn't tell that way.
John> In general, a way in which you Can tell would be useful for
John> many of us DECies. Uni-vs-Q and Q22-vs-18 are the two
John> important ones for me.
You have to find the product name that goes with the board.
Apart from the obvious "if it's hex it must be Unibus" there isn't a
surefire way to tell things apart.
Some heuristics may work: single height boards show up in old Unibus
options (e.g., M105). If a dual height board is densely packed with
stuff, it's probably QBus, since dual height Unibus related modules
are also early modules and will have loosely packed small TTL parts on
them.
paul