alt Hacker Newsone 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)
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bluGill • today at 4:30 PM
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)
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.