Date   : Thu, 23 May 1991 16:53:52 GMT
From   : nuchat!farwest!Uucp@uunet.uu.net (Charles Cotham)
Subject: Osborne 1

Ewen,
 
   I am talking off the top of my head right now, my tech manual are at 
the house, but I believe that the Osb-1 serial port has normal RS-232 
levels. The modem port is the port with the TTL levels, I have a 
schematic at the house to build an adapter to change the modem port to 
regular 232 levels using , 1488 and 1489 driver chips as I remember. It 
also has the resistances to insert in the other lines on the Modem Port. 
To use the Serial port with a Hayes type modem you have to use pins 2 & 
3 reversed to the modem and pin 7 to pin 7 on the modem. Imp 244 works 
real well on mine and ZMP 15 with zmodem protocal is also nice. I have a 
couple of articles on drive alignment and a mod to increase the 
readability of Osborne drive span with a capacitor change. Leave me a 
note or my address is below if you would like some of the info I have. I 
would be glad to send it to you. See you later. Love my OZZIE.
 
                         Charles Cotham
                         2205 Lilac Street
                         Nederland, Tx 77627
PS: Heck I love all 8 of my Ozzies

 * Origin: Two Wheelers - The Bicylists' Communications Link (1:106/88)


End of INFO-CPM Digest V91 Issue #96
************************************