View source for SUPDUP

'''SUPDUP''' is a network protocol for display terminals.  The character set can be standard [[ASCII]], or optionally, an extended version which is based on [[Stanford Extended ASCII]] but closer to ASCII 1967.

The name means "super-duper image mode".  The explanation behind this is that [[Incompatible Timesharing System|ITS]] can open files in various modes; the .OPEN system call offers a choice between ''ASCII mode'' and ''image mode''.  Opening a terminal in ASCII mode means various control characters are interpreted the conventional way.  In image mode, '''most''' characters are passed through uninterpreted, but not all; e.g. ^Z is still trapped by the operating system.  Using special system calls, a file channel can be set to ''super image mode'' in which '''all''' characters with no exception are treated verbatim.  SUPDUP takes this to yet another level by sending display codes as-is from internal ITS buffers, thus they are "super-duper" image.

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==External links==

* [https://tumbleweed.nu/r/lm-3/uv/supdup.html The SUPDUP Protocol]

[[Category: Network Application Protocols]]