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Old 09-09-2007, 01:33 AM
marty marty is offline
Senior Member
 
Join Date: Jun 2007
Posts: 118
Talking

Hi Paul;
I did this awhile back, and ran into the same problem Here is what I did, and I got it to work with my PC. Since I am not at my place and am out of town for another week or so. I can only tell you what I did remotely, and with a bad memory, mine , not the computers. I assume for now that you are using your PC with Hyperterminal.
I looked up rs-232 on the WEB, and looked for 9 pin to 25 pin, and used modem half duplex one way and full duplex the other. The full duplex is from the Altair to the Pc and the half duplex is the other way. Since the 2Sio Board doesn't provide a full duplex both ways. I should be something like this -- I am doing this from memory, so I might be wrong. connect the following --
2 (on the 25 pin) to 3 (on a 25 pin) or its equivalent on the 9 pin
3 "" to 2 "" ""
7 "" to 7 "" ""
(and I think the following)
4,5,8 "" to 20 "" ""
20 "" to 4,5,8 "" ""
( I know pins 4 or 5 possibly may not be right)
and on the Pc to the Altair side as you said it doesn't have 'DSR' So it can't be connected. If you need more help, I can look it up on the web and tell you almost for sure which ones to use. Or wait until I get back home and I will see what my machine has wired up.
Thanks Marty
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