Dear Mr. Auer,
Mr. Ehlert is in France this week but he will be back at the weekend.
He will answer your questions as soon as possible.
Thanks,
i.A. L. Tartan
Sunday, June 13, 2004, 5:01:20 AM, you wrote:
> Hi, I wondered what CLS should do while CTTY points to "not CON".
> Any ideas? I could not find it by Googling, so I assume that people
> will simply not try using CLS over a serial terminal... Or if they
> do
> - the CLEAR / HOME ANSI escape sequence or
> - a bunch for linefeeds or
> - a formfeed
> should do the trick. As CTTY targets can only be CON, NUL and serial
> ports (parallel ports would not make much sense) or other bidirectional
> char devices, I think one of the above choices should be okay. Alternatively,
> even "just always clear the local display even during CTTY non-CON" should
> work just great for everyday CTTY / CLS users.
> Instead of using the CRT unit function, which never updates the screen
> size stuff as it seems, CLS for CON can best be implemented as:
> AH=0f int 10 returns: AH=columns AL=mode BH=page
> read byte 40[84] = max row number on screen
> AH=06 (scroll) AL=0 (zero lines of scrolling, only clear) BH=07 (color,
> for blank lines, should not be zero) CX=0 (upper left corner) DH=40[84]
> DL=the_AH_from_int_10_function_0f int 10 (might destroy BP register but
> has no return values otherwise... Trident VGA might destroy DS register
> in SVGA modes...)
> And finally, not to forget, AH=02
> BH=the_BH_from_int_10_function_0f DX=0
> (top left) int 10, which moves the cursor to home position.
> The int 10.0f can be replaced by 40[...] reading, too. Combined, you
> will have a TINY and RELIABLE (flexible, for different screen sizes, see
> Bugzilla entry number 1687, CLS Assumes 25 Screen Lines) implementation
> of CLS which does not use the CRT library of the C compiler (and therefore
> the whole CRT library would no longer be used by FreeCOM anymore AFAIK).
> The above { get mode by int 10.0f, get rows from RAM, clear by int 10.06,
> home by int 10.02 } should be put after a check for CTTY-non-CON which
> would send one of the 3 suggested strings either instead of doing the
> int 10 stuff or after it to the current CTTY device unless it is CON/NUL.
> Let us know if you have some experience or opinion about "what should
> happen for CLS in combination with CTTY to AUX or NUL or ...". Thanks.
> Eric
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Best regards,
Tom Ehlert
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