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<h1 id="main-title">Macintosh Plus: Imagewriter I Cable Pinouts</h1>
<div id="abstract">
 
<div id="intro-container"><div class="truncate"><div class="attr SYMPTOMS"><div class="attr TOPIC"><FONT SIZE=4><BR>
Article Change History<BR>
----------------------<BR>
05/25/93 - CORRECTED<BR>
           * To update pinouts for the DB-25 to Circular-8 Cable<BR>
<BR>
<BR>
Below is the wiring diagram of the connection between a Macintosh Plus and<BR>
an Apple Imagewriter I. Cables #1 and #2 may be used together for the<BR>
connection or custom cable #3 may be constructed.<BR>
<BR>
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  <div class="attr SUMMARY">
CABLE 1 <BR>
                    Macintosh Imagewriter Cable<BR>
                              590-0169<BR>
 <BR>
                    Macintosh          Imagewriter<BR>
                    Connector          Connector<BR>
                    (DB-9)             (DB-25)<BR>
 <BR>
Comments            Signal    Pin        Pin     Signal   Comments<BR>
                    Name                         Name<BR>
 <BR>
Chassis Ground      GND        1  &lt;----&gt;  1      GND      Chassis/Frame Ground<BR>
Signal Ground       SGND       3, 8 &lt;--&gt;  7      GND      Signal Ground<BR>
Transmit Data       Tx         5   ----&gt;  3      Rx       Receive Data<BR>
Ready to Send       HSK        7  &lt;----   20     DTR      Data Terminal Ready<BR>
Signal Ground       SGND       8  (Connected to pin 3 on the Macintosh side)<BR>
Receive Data        Rx         9  &lt;----   2      Tx       Transmit Data<BR>
 <BR>
 <BR>
CABLE 2<BR>
           Macintosh Plus Circular 8 to DB-9 Adapter<BR>
                          699-0372<BR>
 <BR>
Circular 8         Signal            DB-9<BR>
    1           HSKo (+12V)           6<BR>
    2           HSKi                  7<BR>
    3           TXD-                  5<BR>
    4           GND                   3*<BR>
    5           RXD-                  9<BR>
    6           TXD+                  4<BR>
    7           No Wire<BR>
    8           RXD+                  8<BR>
                GND                   1*<BR>
 <BR>
* Pins 1 and 3 on the DB-9 end are jumpered together.<BR>
 <BR>
The pins on the male end of the circular 8 connector are numbered as shown:<BR>
 <BR>
          6 7 8<BR>
         3 4   5<BR>
           1 2<BR>
 <BR>
CABLE 3<BR>
 <BR>
         Macintosh Plus Circular 8 to DB-25 Custom Cable <BR>
 <BR>
Circular 8                  DB-25<BR>
    1   HSKo (+12V)           6 &amp; 8<BR>
    2   HSKi                  20   DTR<BR>
    3   TXD-                  3    RxD<BR>
    4   GND                   7    GND<BR>
    5   RXD-                  2    TxD<BR>
    6   TXD+                  No Wire<BR>
    7   No Wire               No Wire<BR>
    8   RXD+                  7    GND<BR>
<BR>
<BR></div>
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<div class="mod-date">Published Date: Feb 19, 2012</div>
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