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From: pyramid@gitpyr.UUCP (Pyramid Technology)
Newsgroups: net.micro.68k
Subject: VMEbus problems
Message-ID: <1201@gitpyr.UUCP>
Date: Thu, 19-Dec-85 22:08:40 EST
Article-I.D.: gitpyr.1201
Posted: Thu Dec 19 22:08:40 1985
Date-Received: Sat, 21-Dec-85 00:46:45 EST
Organization: Georgia Institute of Technology
Lines: 22
Keywords: VMEbus 68000

Has anyone had problems using the Zilog 8530 SCC on the Motorola VME333 
Intelligent Communications Controller? We have been trying to debug
a DMA synchronous interface driver and have been getting spurious 
interrupts from the 8530 with an interrupt vector number of $ff.  We
have traced the problem to the 8530's interrupt acknowledge cycle where
it seems to ocassionally forget to put out its vector on the bus. The 
68010 is running at 10 Mhz and the 8530 at 4.9 Mhz. We suspect a timing
problem of some sort but have not been able to isolate it.  Anyone have
any similar experience?  

Thanks in advance

Jim Stratigos
Tridom Corporation
Marietta, GA 30067

...gatech!akgua!tridom!jas

-- 
Pyramid Technology
Georgia Insitute of Technology, Atlanta Georgia, 30332
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