Issue with multiple screen pages and extended mode

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   I have been troubleshooting an odd problem with our application which causes the screen to be displayed incorrectly when run in Accuterm.  In an effort to track down exactly what is causing the problem, I have written a little test program.  I have been successful in replicating the issue in a fairly small chunk of code, but I still haven�t gotten to the root of what�s doing it.

I�m hoping that by sharing my findings on here, somebody will be able to help me pinpoint the problem.

The issue seems to only occur when the following two things are true:

- The session is set up with multiple screen pages (in accuterm settings Terminal > Screen > Screen pages)

- The session switches between normal and extended terminal modes, and the extended mode has over 24 rows.

Here are my session settings:

Terminal emulation : Wyse 60

Screen size (normal) : 80 columns by 24 rows

Screen size (extended) : 160 columns by 46 rows

Screen pages : 2

History rows : 500

Automatic line wrap : enabled

Oh, and I'm running 7.1a sp2 (7.1.1012) on Windows 7 64 bit.

And here is my test program:

     STX = CHAR(2)

     SUB = CHAR(26)

     ESC = CHAR(27)

 *

 * set up control sequences

 *

     CLS = SUB

     FWD = ESC: 'K'

     BCK = ESC: 'J'

     EXTON = ESC: STX: 'E'

     EXTOFF = ESC: STX: 'N'

 *

 * switch to either normal or extended mode

 *

     CRT 'A - extended mode, B - normal mode '

     INPUT A

     BEGIN CASE

       CASE A = 'A'

         CRT EXTON:

         NO.COLS = 160

         NO.ROWS = 46

       CASE A = 'B'

         CRT EXTOFF:

         NO.COLS = 80

         NO.ROWS = 24

       CASE 1

         STOP

     END CASE

 *

 * forward page and clear screen

 *

     CRT FWD: CLS:

     DX = 0; DY = 0; GOSUB Move

 *

 * fill every row

 *

     FOR Y = 1 TO NO.ROWS

       DY = Y - 1

       DX = 0

       GOSUB Move

       STRING = (Y 'R%2'): '/': NO.ROWS 'R%2': STR('.', NO.COLS - 6)

       CRT STRING

    NEXT Y

    DX = 0; DY = 0; GOSUB Move

    STOP

*

**

**

*

Move: ** equiv to @(DX,DY):

*

    STRING = ESC: 'a': (DY + 1) 'R%2': 'R': (DX + 1) 'R%3': 'C'

    CRT STRING:

    RETURN

Please excuse the hard coded sequences, I wanted to completely rule out any device driver complications.

When I run the program and select B (normal mode) the result is as expected:

However when I run the program and select A (extended mode) the screen does not display as expected:

Note that we have a blank line introduced after row 24 � it�s as if Accuterm�s page sizes have got mixed up.

From this point on the session is almost unusable.  Clearing the screen only clears the first 24 rows for example.  Choosing �reset terminal� from the menu brings back order and everything is fine again.

Is this a bug in Accuterm and are there any workarounds?

Any help or suggestions gratefully received!

Mark