[ck2]

one thing I distinctly remember is that when simultaneous two-way Zmodem transfers came out replacing Ymodem, it absolutely blew my mind

(previously all transfers, Xmodem/Ymodem, were one-way with CRC checks on each block slowing things down)

[kylemaxwell]

My 8th-grade science project was doing a "statistical" analysis of X/Y/Zmodem transfers (and Kermit, I think?). It did well enough to get me to the county science fair here in Dallas, at least.

And yeah, Zmodem was mind-blowing for us.

[iberator]

zmodem/xmodem can still be used over ssh :) kermit is actually still in development.

I used it in like 2021 to transfer some data over serial from some really old laptop (386sx). Was faster than txp/ip over plip/slip

[bluGill]

Ymodem-g (I think I remember that correctly) was faster than Zmodem - but if the CRC failed it aborted the whole send. Often I was willing to take the risk. (at 300 baud that adds up)