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Home » RBC Forums » General Discussion » xmodem-1K, ymodem, or zmodem (improved data transfer programs for CP/M)
Re: xmodem, ymodem, zmodem [message #9025 is a reply to message #9024] Fri, 20 August 2021 06:26 Go to previous messageGo to previous message
jayindallas is currently offline  jayindallas
Messages: 110
Registered: June 2021
Senior Member
These three names X/Y/Zmodem invoke memories of the CP/M+Modem experiences of the 80s.
This sequence equate into the cringe of getting a remote connection to a computer I fixed up for my parents, so I could transfer a file to their system. Their system had 8" drives, mine were 5.25" drives, so it was better if I could send the files to their computer before I arrived to install it.

With X-modem and a one-phoneline household at the remote end, I had to spend 30 minutes to an hour telling them the keyboard sequence they'd have to type once they hungup the phone and activated the modem for my call... plus all the trial and error of their keystrokes and the many attempts to start-over. It was so nearly impossible that I paid to put a second phoneline in their house for the modem, so I could live-chat them through the process. I liked X-Modem in general, but these particular transfers still haunt me. Smile

Y-modem was nice improvement. The walkthrough time seems like it dropped to 15 to 5 minutes. In comparison to X-Modem it seemed like the ultimate improvement... at the time.

Z-Modem was THE REAL great improvement, I just had to tell them to turn the modem on and I could handle most everything on my end of the call.

I don't remember much about the modem commands I had to talk them through, back in the day, my memory of them are all about the time it took to get my parents to enter the necessary commands on their side of the connection.

Glad that doesn't need to happen anymore. Smile

[Updated on: Fri, 20 August 2021 06:44]

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