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Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxn!ihnp4!qantel!hplabs!hpda!fortune!wdl1!jbn
From: jbn@wdl1.UUCP
Newsgroups: net.micro.68k
Subject: Ironics VMEbus RAM card problem
Message-ID: <588@wdl1.UUCP>
Date: Mon, 5-Aug-85 01:32:03 EDT
Article-I.D.: wdl1.588
Posted: Mon Aug  5 01:32:03 1985
Date-Received: Tue, 6-Aug-85 12:24:16 EDT
Sender: notes@wdl1.UUCP
Organization: Ford Aerospace, Western Development Laboratories
Lines: 11
Nf-ID: #N:wdl1:22700014:000:420
Nf-From: wdl1!jbn    Jul 30 13:13:00 1985


     We have discovered that the Ironics VMEbus 512K dynamic RAM card raises 
DTACK on the bus before it is really done with the data; this causes serious
problems in high speed applications, especially if 32-bit transfers are
involved.  When the bus master is a M680x0, everything seems to work fine,
but very fast DMA devices encounter problems.

				John Nagle
				Ford Aerospace and Communications Corporation