zmodem picture from Obsolete Computer Museum

1986 – Telenet funded a project to develop an improved public domain application to application file transfer protocol. This protocol would alleviate the throughput problems their network customers were experiencing with XMODEM and Kermit file transfers. ZMODEM could provide high performance and reliability over packet switched networks while preserving XMODEM’s simplicity. It made XModem and YModem obsolete.

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Other Day in Tech History items:

• Chuck Yeager flies the speed of sound
• ARM 250 is released