Re: [Freedos-user] ECHO vs @ECHO

[tom ehlert]

>> in addition, neither I nor you know if 'CTTY NUL' works on MSDOS 3.0

> The original requirement was MSDOS <3.30.
> I tested with MSDOS 3.21 and it worked.

> Test with MSDOS 3.0 was okay too.

correcting myself, CTTY NUL probably always worked, from MSDOS 1.0,
as MSDOS was supposed (I never tested) to be able to run on a serial
terminal.

so

   CTTY COM1

would redirect input and output to COM1. and you could move the cursor
on the screen (and other stuff) using ESCape sequences. ANSI.SYS was used
to simulate this (I think a VT100 terminal) on the CGA display, so
software could be written that would work 'everywhere'.

Tom





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