jea@merlin.cvs.rochester.edu (Joanne Albano) (02/24/90)
For those not following this thread I will rehash that
this bus terminator has enabled our A1000 to run the
CMI and Starboard simultaneously. As a wonderful
side effect we now no longer enjoy the unexplained gurus
we were experiencing.
Since I have received so many requests for this info
I will post it here-- it should be included in the info
digest though. Ranjit passed this info to me. Thanks.
It originates from Brad@Anakin Thanks to you too.
From: Anakin Research <anakin@gpu.utcs.toronto.edu>
Newsgroups: comp.sys.amiga
Subject: Re: Memory boards and bus noise
Message-ID: <1989Jan31.135929.750@gpu.utcs.toronto.edu>
Date: 31 Jan 89 18:59:29 GMT
Organization: University of Toronto Computing Services
I've also had a number of questions in my E-mail on the bus
terminator to help with bus noise on the A1000, so here t'is
pin 1,2,3,4 Ground
pin 5,6 5V+
*Note: Grounds also at 13,25,37,49,61,73,85
Signals to terminate: (20)
pin 63 D15
pin 65 D14
pin 67 D13 pin 68 R/*W
pin 69 D12 pin 70 *LDS
pin 71 D11 pin 72 *UDS
pin 74 *AS
pin 75 D0 pin 76 D10
pin 77 D1 pin 78 D9
pin 79 D2 pin 80 D8
pin 81 D3 pin 82 D7
pin 83 D4 pin 84 D6
pin 86 D5
The pins on the 86 pin expansion connector are numbered 1 on the
top front pin, 2 on the bottom front pin, etc. ie. odd numbers on top,
even on the bottom of the connector on the A1000
For the record, here is the network which is connected to
each of the 20 signals listed above:
4.7K
Signal<----*--------/\/\/\/\/\-------------->5V+
|
| 1000 pf.
| 1.0K
| | |
*--------/\/\/\/\/\----| |------->Ground
| |
*NOTE: must be ceramic
Terminator should be put on the last peripheral in the chain.
Brad anakin@utcs.gpu.toronto.edu
Joanne Albano, Center for Visual Science (716) 275-3055
Room 274 Meliora Hall, Univ. of Rochester, Rochester NY 14627
INTERNET: jea@cvs.rochester.edu