QBus termination?

Patrick Finnegan pat at computer-refuge.org
Mon Feb 7 20:17:08 CST 2005


Pete Turnbull declared on Monday 07 February 2005 09:09 pm:
> On Feb 7 2005, 20:32, Patrick Finnegan wrote:
> > The RQDX3 doesn't, but an RQDX[1] does.  Also, a BDV11 and an M9400
>
> An RQDX1 does not terminate the bus.  It has one resistor pack, but
> it's not for bus termination.  Perhaps you're thinking of the fact
> that an RQDX1 must be the last device on the bus (unless you don't
> care about DMA or interrupts further down) but that's only becasue a
> bug means it doesn't pass BIAK or BDMG.  An RQDX2, however, which is a
> modified RQDX1, does pass BIAK and BDMG, doesn't need to be the last
> device on the bus, and often isn't.

Yes, this is what I was thinking of.  I stand corrected. :)

Pat
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Purdue University ITAP/RCS        --- http://www.itap.purdue.edu/rcs/
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