I found it. 5 flashes indicates a fault with the 6810 128-byte static RAM at position 4D. cheers, Rob On 24/04/2018 14:51, Rob Clarke wrote: > Right. I also came to the same conclusion, and bought those same from > ebay and they worked fine. There is no service manual for the > controller, but there is for the TMS848-02 drive mechanisms. > > I also disassembled the ROM in order to get mine working and even > resorted to making my own custom ROM's to diagnose the problem, using > various combinations of the 3 LED's to track it down. If I can find my > disassemblies I will confirm the meaning of 5 flashes. > > cheers, Rob > > > On 24/04/2018 07:52, vossi wrote: >> I found the solution! >> >> At the 1791 controller datasheet on the last page you see this: >> A = ceramic >> B = plastic >> >> At ebay I found 1797A-02 - thats the better ceramic version of B-02 >> and I >> found chips 1797-PL - thats the new name for the 1797B with the usual >> P=plastic! >> >> <http://cbm-hackers.2304266.n4.nabble.com/file/t374762/Bildschirmfoto_2018-04-24_um_07.png> >> >> >> >> ----- >> greets >> Christian >> -- >> Sent from: http://cbm-hackers.2304266.n4.nabble.com/Received on 2018-04-24 16:00:03
Archive generated by hypermail 2.2.0.
