Jeff_A_Scott@cup.portal.com (07/18/89)
[ ] Well, I wasn't interested in the bus terminator a while back when all the Lucas people were talking about it as the way to eliminate problems with expansion devices. I'm starting to get a few restarts lately and think I should try it. Could someone please send me a copy of how to construct the terminator. Thanks in advance. Jeff Scott jscott@cup.portal.com ... !sun!portal!cup.portal.com!jscott
anakin@gpu.utcs.utoronto.ca (Anakin Research) (07/20/89)
Bus Terminator
To build the bus terminator you will need an 86 pin wire wrap
edge connector, 20 10k resistors, 20 1k resistors and 20 .1 mf monolithic
caps. Basically you want to put a termination network on each of the 16
datalines plus on the four control lines, *AS, R/*W, *UDS, and *LDS. The
network looks like this:
10K
Signal >--------------/\/\/\/\/------->5V+
|
| | | .1 cap
----/\/\/\/\/--| |----
| | |
1K | Ground
----
/ / /
86 pin connector
Note: pins number at 1 on the top pin closest to the front of
the amiga, 2 underneath, 3 back on top next to 1 etc.
Pin 1,2,3,4,13,25,37,49,61,73,85 Ground
Pin 5,6 5V+
Pin 75 D0 Pin 80 D8
Pin 77 D1 Pin 78 D9
Pin 79 D2 Pin 76 D10
Pin 81 D3 Pin 71 D11
Pin 83 D4 Pin 69 D12
Pin 86 D5 Pin 67 D13
Pin 84 D6 Pin 65 D14
Pin 82 D7 Pin 63 D15
Pin 74 *AS Pin 68 R/*W
Pin 70 *LDS Pin 72 *UDS
Brad Fowles anakin@utgpu
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