Hi all,
I have an 18MC with the following IO problems:
IO ports 0 & 1 (JD5A) will receive files from the PC no problem but will not upload to the PC. The PC times out and on the machine 'Output' flashes indefinitely and I have to reset to stop it. Cable works on other machines.
IO port 2 (JD5B) does not work at all. Parameters for baud rate etc. are present and set correctly, but if I try to read or punch with IO set to 2 nothing happens when I press EXEC. No flashing 'Input' of 'Output', machine doesn't lock up, just nothing at all happens. Also, the PC won't establish an initial connection.
Some searching suggests there may be a blown chip on JD5A, and that JD5B was an option that may not have been activated.
I have no problem replacing a blown chip, but am reluctant as I currently have no way to back up parameters, memory etc.
Does anybody know how to activate JD5B if it is currently not activated?
Also, any other suggestions greatly appreciated.
Thanks in advance
Karl