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  #1  
Old 12-09-2007, 10:58 PM
Cappellanus Cappellanus is offline
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Default forgot picture...

Ooops, forgot the picture.

No, not me. My little girl! She's actually less interested in vintage computers than you'd think by the photo.
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Last edited by Grant Stockly; 09-10-2012 at 09:14 PM.
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  #2  
Old 12-10-2007, 05:15 AM
Cappellanus Cappellanus is offline
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Default Oh, I talked too soon (Tie inputs high through resistors)

I guess I talked too soon, and found the answer to why John Blankenbaker tied the inputs to his TTL chips through a resistor to the +5 volt supply. I appreciate that nobody has yet slammed me. I guess there was reason for all those extra resistors after all. Was this obvious to everyone except me?

Last edited by Grant Stockly; 09-10-2012 at 09:14 PM.
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Old 12-10-2007, 06:06 AM
Grant Stockly Grant Stockly is offline
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Quote:
Originally Posted by Cappellanus View Post
I guess I talked too soon, and found the answer to why John Blankenbaker tied the inputs to his TTL chips through a resistor to the +5 volt supply. I appreciate that nobody has yet slammed me. I guess there was reason for all those extra resistors after all. Was this obvious to everyone except me?
Is it to limit input current or prevent a latch-up? The Kenbak was designed in 70-71, so the TTL chips were pretty new.
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