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From: jea@merlin.cvs.rochester.edu (Joanne Albano)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Bus Terminator
Message-ID: <7760@ur-cc.UUCP>
Date: 6 Jun 90 14:49:53 GMT
References: <1990Jun4.115118.16044@csusac.csus.edu>
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Reply-To: jea@cvs.rochester.edu (Joanne Albano)
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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