Re: 8280 Jumper Settings

From: Mike Stein <*mhs.stein_at_gmail.com*> Date: Wed, 9 Jan 2019 23:20:16 -0500 Message-ID: <549F6B04497748F4955E59760AC7121E@310e2> · mhs.stein_at_gmail.com

----- Original Message ----- 
From: "vossi" <vossi@ceffy.de>
To: <cbm-hackers@musoftware.de>
Sent: Wednesday, January 09, 2019 5:03 PM
Subject: Re: 8280 Jumper Settings

> Hi, I have the service documents for Rev. B and for Rev. D-E. here:
> 
> http://www.ceffy.de/Tandon_TM848_Specification_and_Schematic_1981_Rev-B.pdf
> <http://www.ceffy.de/Tandon_TM848_Specification_and_Schematic_1981_Rev-B.pdf>  
> 
> http://www.ceffy.de/Tandon_TM848_service_manual_1982_Rev-DE.pdf
> <http://www.ceffy.de/Tandon_TM848_service_manual_1982_Rev-DE.pdf>  
> 
> But I also have a defective Rev. F PCB  and no schematics for it. It has
> 7400 instead of 7474 after the index-sensors... and some other changes...
> 
> Christian
------

Thanks very much!

I've never had occasion to look at mine in detail and never noticed that they're all different revisions ;-)

I'm looking at a 210060-000 REV F board, assy no. 210094 REV P, and if you're talking about U33 it's a 74LS04 on this board.

What's wrong with yours?

I assume yours are all the belt-drive models?

m