On 9/2/2020 2:29 AM, tom ehlert wrote:
UNIX System V certainly was connected to serial terminals (Televideo,
VT100, ...)
and it had the VI visual editor with definitively cursor movement
across the screen, even when the terminal had no cursor keys.
cursor movement is not tied to memory-mapped devices, and even old DOS
Software (MS Word and friends) were derivative of CP/M software where
they also have to live with serial terminals. they (for the most part)
used only BIOS funtions for screen control.
only much later direct memory control became en vogue.
Well, yes, serial terminals had (depending on the model) quite
sophisticated means of cursor control, however this is something that on
the DOS level needs to be supported. And there are/were many different
and largely incompatible sets of terminal control codes out there...
Ralf
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