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
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