13 Feb
2006
13 Feb
'06
7:14 a.m.
The writeup that IBM published at the time, said they
handled slot 8
differently to support the expansion interface. The bus driver was normally
off unless a device the the expansion chassis was addressed.
I assume it would be for RFI reduction, but that's a guess on my part.
I will ahve to check the techref to see if the expansion card (I assume
you mean the card that links to the 5161 expansion unit) does anything
with pin B8.
I do know that the expansion card does not _have_ to be in slot 8. It
will work in any slot. It's supported on the 5155, where the card will
not physically go in slot 8. Anf I've seen working systems with an Async
card in slot 8 and the expansion card in some other slot.
-tony