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Re: Which company is MFR90073? (Manufacturer of TTL chips in 1981)...

by Erik Baigar <erik@[EMAIL PROTECTED] > Jun 17, 2008 at 06:14 PM

Erik Baigar wrote:
> The second remaining unknown is the 214/020. Here I still have no
> guess.
Did more measurements on this one and investigated the circuitry
around these chips. Now it is quite obvious: The 214-020 is a 
input frontend containing 5 diodes and 5 pull-down resistors. 

I put a summary on all these custom chips on my web page at: 
http://www.baigar.de/TornadoComputerUnit/PECchips/PECchips.html

On the 214-020, the common pin is connected to ground and the 
resistors act as pull-downs. The input signals of the unit 
are applied to the diodes which ****ft the level 0.7V towards
ground and the unit is listening to the junction between diode 
and resistor. Thus the combination increases noise resistance 
of the inputs and acts as pull-down...

   Thanks for all comments...

       Best regards,

          Erik.
 




 12 Posts in Topic:
Which company is MFR90073? (Manufacturer of TTL chips in 1981)..
Erik Baigar <erik@[EMA  2008-06-07 21:43:09 
Re: Which company is MFR90073? (Manufacturer of TTL chips in 198
Erik Baigar <erik@[EMA  2008-06-07 21:45:15 
Re: Which company is MFR90073? (Manufacturer of TTL chips in 198
"Marko" <kla  2008-06-07 15:59:55 
Re: Which company is MFR90073? (Manufacturer of TTL chips in 198
Erik Baigar <erik@[EMA  2008-06-12 06:27:49 
Re: Which company is MFR90073? (Manufacturer of TTL chips in 198
Franc Zabkar <fzabkar@  2008-06-13 08:16:55 
Re: Which company is MFR90073? (Manufacturer of TTL chips in 198
Erik Baigar <erik@[EMA  2008-06-16 17:57:43 
Re: Which company is MFR90073? (Manufacturer of TTL chips in 198
Erik Baigar <erik@[EMA  2008-06-17 18:14:28 
Re: Which company is MFR90073? (Manufacturer of TTL chips in 198
"Marko" <kla  2008-06-07 16:47:12 
Re: Which company is MFR90073? (Manufacturer of TTL chips in 198
"Marko" <kla  2008-06-07 17:16:53 
Re: Which company is MFR90073? (Manufacturer of TTL chips in 198
Erik Baigar <erik@[EMA  2008-06-12 06:57:07 
Re: Which company is MFR90073? (Manufacturer of TTL chips in 198
Franc Zabkar <fzabkar@  2008-06-08 09:06:21 
Re: Which company is MFR90073? (Manufacturer of TTL chips in 198
Erik Baigar <erik@[EMA  2008-06-12 06:51:31 

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