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Forum: Altair 8800

08-27-2009, 03:20 AM

Replies: 10

880-107 1k static memory board

Views: 47,996

Posted By marty

1 K

Hi Ben;

THEN You have a different Front Panel Board, then I do. But as long as Ic S is connected to pin 39, That is all that counts... Then Don't worry about it... As on the Rev 0 boards it uses...

Forum: Altair 8800

08-24-2009, 12:59 PM

Replies: 10

880-107 1k static memory board

Views: 47,996

Posted By marty

1 K

Hi Ben;
I coppied out the how the Transistor circuit is from the Board lay-out, and I think that is what they intended to draw on the Schematic , where both resistors are pulled up, instead of one...

Forum: Altair 8800

08-24-2009, 02:35 AM

Replies: 10

880-107 1k static memory board

Views: 47,996

Posted By marty

1 K

Hi Benalford;
I just got thru checking J1 on the Front Panel, that I have from Grant, it connects Ic S pin 11 to wire connection 39. And I also checked the Schematic, they are the same....
THANK...

Forum: Altair 8800

08-24-2009, 01:52 AM

Replies: 10

880-107 1k static memory board

Views: 47,996

Posted By marty

1K ststic

Hi Benalford;
I checked the Schematics, and you were right on one and wrong on the other, and the jumper I'll have to check on... On the Transistor you are right, and on IC K you are wrong, a closer...

Forum: Altair 8800

08-19-2009, 12:50 PM

Replies: 10

880-107 1k static memory board

Views: 47,996

Posted By marty

1 K

Hi;
I should have restated what I last said in my last post, When trying an unknown pin , then go thru a resistor, to protect the circuit and the power supply, such as connecting a line that goes to...

Forum: Altair 8800

08-18-2009, 03:20 PM

Replies: 10

880-107 1k static memory board

Views: 47,996

Posted By marty

1 K

Hi ;
You should connect the +5 thru a pull-up resistor like about 1K. Just in case...I would need to look at the schematic to see what it does...
THANK YOU Marty

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