Just acquired a NTSC //c ROM0 , and have an odd problem with the serial port (modem). If the //c is connected to my PC with null modem cable, and PC is powered on, the //c won't power on, nothing, no LEDs, remove the serial cable and it comes to life, reconnect the cable and I can send serial data to the //c from the PC, ADTPro won't receive a file list from the PC, I have a suspicion the //c won't send data to the PC.
I have tried using a Mac mini and USB serial adaptor with the same results. Incidentally both PC and Mac ADTPro work with my IIe, obviously a different cable.
Have checked my cable with my DMM and all seems fine.
Anyone have any thoughts where the problem may be?
Thanks for any input