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From: mccla_d@poppy.cs.odu.edu (dennis mcclain-furmanski)
Newsgroups: comp.sys.apple2
Subject: RE: Pinouts for 20 Pin --> 5 1/4
Message-ID: <MCCLA_D.92Feb9141926@poppy.cs.odu.edu>
Date: 9 Feb 92 19:19:26 GMT
Sender: news@cs.odu.edu (News File Owner)
Distribution: comp
Organization: Old Dominion University, Norfolk, VA, USA
Lines: 89
Nntp-Posting-Host: poppy.cs.odu.edu
Here's the techie junk I have on it:
APPLE //C & GS DISK ][ ADAPTER CABLES
Parts needed:
1 IDP 20 plug (two for GS Dual Drive adapter)
1 DB 19 pin male connector
3' 20 conductor ribbon cable
to build the adapter cables get an IDP-20 plug for //c adapter (Two for GS)
one DB-19 male socket and three feet of 20 conductor ribbon cable for each
drive and connect the connectors as shown.
IDP-20 pins DB-19 pins
1 GND-------------------> 1 GND
2 PHASE 0---------------> 11 PHASE A
3 GND-------------------> 2 GND
4 PHASE 1---------------> 12 PHASE B
5 GND-------------------> 3 GND
6 PHASE 2---------------> 13 PHASE C
7 GND-------------------> 4 GND
8 PHASE 3---------------> 14 PHASE D
9 -12 V-----------------> 5 -12V
10 WRITE REQ-------------> 15 WRITE REQ
11 +5V-------------------> 6 +5V
12 +5V-------------------> 6 +5V
13 +12-------------------> 7 +12V
14 DRIVE ENABLE----------> 17 Drive one or 9 for drive 2 on GS
15 +12V------------------> 7 +12V
16 READ DATA-------------> 18 READ DATA
17 +12V------------------> 8 +12V
18 WRITE DATA------------> 19 WRITE DATA
19 +12V------------------> 8 +12V
20 WRITE PROTECT---------> 10 WRITE PROTECT
16 NOT CONNECTED
One reliable source I've found for male DB19 connectors is JDR Micro Devices
800-538-5000 or 408-866-6200.
I find it's easiest to connect the IDP connector to the ribbon cable first
then soldering the various wires to the DB19. (Explains why I layed out the
list the way I did doesn't it?).
Once the cable is made connect the IDP connector to the twenty pin connector
on your Disk ][ taking care that pin 1 of the plug connects to pin 1 of the
drive connector.
!!!!Failure to do this will destroy your motherboard!!!!
These cables can be tricky and tedious to make. Be very careful and check all
connections thoroughly. It's easy to mix them up. It is usually best to have
someone else check the cable for the proper connections, since they will
usually catch mistakes you might miss. To be safe ohm out the connections or
use a continuity tester.
!!!An incorrectly made cable can destroy your GS or //c motherboard!!!
I can accept no responsibility for incorrectly made cables.
Layout of IDP 20
1 3 5 7 9 11 13 15 17
_____________====_____________
| o o o o o o o o o o |
| o o o o o o o o o o |
|______________________________|
2 4 6 8 10 12 14 16 20
Pin one is usually marked with an arrow.
Layout of DB19
1 2 3 4 5 6 7 8 9 10
_______________________________
\ . . . . . . . . . . /
\ . . . . . . . . . /
\ _________________________ /
11 12 13 14 15 16 17 18 19
====================================
I got this from AOL - don't have the original
author's name.