[Simh] Gah! ascii don't work??!

From: Ashley Carder <wacarder_at_usit.net>
Date: Sun Oct 17 17:44:59 2004

-----Original Message-----
From: Ron Hudson <ron.hudson_at_sbcglobal.net>
Sent: Oct 17, 2004 3:31 PM
To: simh_at_trailing-edge.com, Kevin Handy <kth_at_srv.net>,
        Classic Computers <cctalk_at_classiccmp.org>
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
Received on Sun Oct 17 2004 - 17:44:59 BST