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From: muller@sdcc7.UUCP
Newsgroups: comp.unix.questions
Subject: Re: Blit on a 4.3BSD MicroVax-II ?
Message-ID: <933@sdcc7.ucsd.EDU>
Date: Wed, 8-Jul-87 16:50:14 EDT
Article-I.D.: sdcc7.933
Posted: Wed Jul  8 16:50:14 1987
Date-Received: Sat, 11-Jul-87 13:59:24 EDT
References: <614@hslrswi.UUCP>
Organization: University of California, San Diego
Lines: 12
Keywords: Blit DMD 5620 MicroVax-II DHU-11
Summary: blit hangs


Sounds like extra flow control characters are being added. The dmf hardware
supports a optional "auto xon/xoff" mode (which is NOT used in 4.3). Unless
the 5620 runs in "lan encoding" mode, it would hang with this as the 8 bit
data sent would trigger the "auto xoff" if the dhu boards has a similar mode and
it was NOT turned off.  (The layers software on 4.3 runs in raw mode for the
packet driver).  The other way it happens if the connection from the 5620 to
the machine is through a "LAN network" (like UB Net One) which add "in-band"
flow control to support end-to-end flow control on the network.

	Keith Muller
	University of California