[Simh] Gah! ascii don't work??! - test-drb@ccmp.vtda.org

17 Oct 2004

-----Original Message-----
From: Ron Hudson &lt;ron.hudson(a)sbcglobal.net&gt;
Sent: Oct 17, 2004 3:31 PM
To: simh(a)trailing-edge.com, Kevin Handy &lt;kth(a)srv.net&gt;et>, 
	Classic Computers &lt;cctalk(a)classiccmp.org&gt;
Subject: Re: [Simh] Gah! ascii don't work??!

On Oct 17, 2004, at 12:32 PM, Kevin Handy wrote:

...
  Ron Hudson wrote:

  simh running rsts

 print chr$(27);"[2J"
  Try

    print chr$(27+128);"[2J"

 RSTS plays odd games with the escape character (prints it as
 a dollar sign most of the time), and setting the parity bit helps.
 There are various "open" modes, and terminal settings that
 will bypass this, but this is easier.

> prints
> 
Ready

10 print chr$(27+128);"[2J"
run
NEW     12:25 PM        17-Oct-84
?[2J

Ready

--------------
nope, that don't do it either. It's the same output on the terminal too.
What about +256? are they 8 bit chars? hmm no that would just be 27 
again...
chr$ does a MODULO right?
----------------------

Ashley says:

Ron,
The way I always cleared the screen in Basic-Plus on RSTS on a VT50 or VT52
terminal was:

PRINT CHR$(155)+"H"+CHR$(155)+"J"

The CHR$(155)+"H" positions the cursor in the top left of the screen
Then, the CHR$(155)+"J" clears the screen.

This is all from memory.  I haven't actually written that kind of code
since the late 1970s.

Ashley