Checksum: 20863
Path: utzoo!utgpu!anakin
From: anakin@gpu.utcs.toronto.edu (Anakin Research)
Date: Tue, 31-Jan-89 13:59:29 EST
Message-ID: <1989Jan31.135929.750@gpu.utcs.toronto.edu>
Organization: University of Toronto Computing Services
Newsgroups: comp.sys.amiga
Subject: Re: Memory boards and bus noise
References: <cXt-9gy00Vo848QEwt@andrew.cmu.edu>
Reply-To: anakin@gpu.utcs.UUCP (Anakin Research)

        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