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I was using a variable supply but just bought a 7.5v switching supply in "wall adapter" form factor. It comes with the correct connector for the Micro-KIM and works great. It is rated up to 1.6A so has more than enough capacity to power the Micro-KIM. Purchased from Mouser as 418-TR1507 fo...
by RichLeary
Jan Sat 26, 2008 11:06 am
 
Forum: Micro-KIM General Discussion
Topic: Power Supply
Replies: 2
Views: 5682

The Micro-KIM acts like a modem. That means a straight through cable from your Linux machine should work. Set comm rate to 1200 bps and no handshaking to start with. If you can introduce character and line delays do so as suggested in the Micro-KIM manual. With jumper in place do a Micro-KIM reset a...
by RichLeary
Jan Thu 24, 2008 1:49 pm
 
Forum: Troubleshooting
Topic: Serial port checkout?
Replies: 8
Views: 19092

With the 1000 ohm resistor and the existing 220 ohm resistor in series with the Q7 output there should be no ill effects on Q7. The -9v through the 1000 ohm resistor does limit the positive swing to probably +3v or so. I did not put the scope on it to check that but +3v would still meet RS232 spec a...
by RichLeary
Jan Thu 17, 2008 9:37 am
 
Forum: Troubleshooting
Topic: RS-232 Fix
Replies: 3
Views: 9002

32K RAM card

Vince,

What is latest estimate for availability of new run of 32K RAM Cards?

Rich
by RichLeary
Jan Tue 15, 2008 3:12 pm
 
Forum: Micro-KIM General Discussion
Topic: New 32K RAM card
Replies: 12
Views: 24885

RS-232 Fix

My Micro-KIM is working great but the RS-232 interface (transmit only) does not work with all machines. I found that for some I needed to bias the static voltage on pin 2 to a true negative value. The simplest approach I had success with was just to use a 9v battery with the positive terminal connec...
by RichLeary
Jan Tue 15, 2008 3:04 pm
 
Forum: Troubleshooting
Topic: RS-232 Fix
Replies: 3
Views: 9002

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