C128

Subject: RS232C Adaptor C/64-C128

I have been getting mail regarding the RS 232 adaptor, in that the message
has gotten scrambled. So, here it is again...

******************************************************************************

Here's a simple interface to connect a C64/128
to any of the multimode boxes on the market.

This circuit has been used between a C64 and
an AEA PK-232, and an MFJ-1270 TNC. Running
the Common Sense terminal program...........


C64/128           RS232 Adaptor            RS232C
====================================================
A&N --------------- Ground --------------- 1&7
B&C ------------- 2-7404-1 --------------- 3   RXD
  M ------------- 3-7404-4 --------------- 2   TXD
  H -------------------------------------- 8   DCD
  E -------------------------------------- 20  DTR
  K -------------------------------------- 5   CTS
  L -------------------------------------- 6   DSR

7404 is a Hex Inverter IC. Only two sections are used.
Pin 7 is ground. Pin 14 is Vcc. This is obtained from
the C64/128 RS232C port pin #2.....

Enjoy..............
73, Kraig  WB2PLW @ VE3SNP