Thompson/RCA DCM425C Flashing -- Linux snmp bash script

[Radiotubes]

I used what is known as a serial cable. It has a level shifting chip on it such as a MAX232 or MAX233 that converts the voltages to ttl levels. You only have to hook this up to monitor the console (UART) output so you know when to short the flash pins and put the modem into emergency state. The actual programming is done over the ethernet cable via tftp.