Fresh battery is in place.
I really thing it is either a dead CPU or the EEPROM got scrambled. I
found a source for a low cost CPU so I ordered it.
When looking at the signals with the O'scope, the IRQ line does not look
right:
https://goo.gl/photos/6ohJcT8Lu4qrSsVp9
All the other logic line look nice with out the finky ripple on the lines.
If I remove the CPU this line goes to nice smooth a logic high, which is
what ll the digital line with a logic high on it look like.
If I swap the CPU and that does not cure it, I am going to say the EEPROM
is dead.
I wonder if TenTec would have the source code for the 6805 assembly code,
or the EPROM image stored somehwere and I can re-burn since it looks like I
can still get the eprom as well, I just would need to get a burner.
On Tue, Sep 13, 2016 at 2:41 PM, Stuart Rohre <rohre@arlut.utexas.edu>
wrote:
> One of the posts mentioned checking to see if the back up battery is fresh
> (and full voltage). If the coin type batteries or similar are used, they
> may need replacement in 3 to 7 years depending on type.
>
> Memories are pretty reliable, unless they have been plugged in and out too
> much as in computer ram sticks.
>
> Stuart Rohre
>
> K5KVH
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
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