Path: utzoo!utgpu!water!watmath!clyde!cbosgd!ucbvax!TCGOULD.TN.CORNELL.EDU!andy
From: andy@TCGOULD.TN.CORNELL.EDU (Andy Pfiffer)
Newsgroups: comp.sys.transputer
Subject: Re:  QBUS Interface for Transputer
Message-ID: <8801062152.AA05212@tcgould.TN.CORNELL.EDU>
Date: 6 Jan 88 21:52:42 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Distribution: world
Organization: The ARPA Internet
Lines: 30

FPS (Floating Point Systems) makes a Q22 bus board (for uVaxen) that
contains a T414-15 and 64K of RAM.  I believer there is room on board
for EPROMS, although our board doesn't have any.

3 of the T414's links are brought out to differential-drivers
(CSA and T-Series compatible).  The fourth link is connected to
a link adaptor that sits on the QBUS.

Data can be transferred to and from the T414 through the link adaptor and
through a DMA controller visible only from the T414 side.  Along with
some misc. 2-way status bits there are also interrupt lines in each
direction.  There are also some control lines that are programmable
from the T414 side that are meant to connect to an FPS T-Series
machine.

However, the link adaptor is NOT interrupt driven -- the data ready bits
(in and out) must be polled from the QBUS side.  (The overhead for servicing
a byte-by-byte interrupt is VERY high on a uVax).

All-in-all, its a pretty nifty board.

If you can get FPS to sell you one (make SURE you get the hardware manual),
it might be just what you need.  I believe that FPS calls it their "T-Series
Q22 Interface Board."

We use our own homebrew driver (Mt. Xinu 4.3 and local software in the T4)
to treat the 3 available links as directly connected link adaptors.


	Andy