I should have remembered the 14-bit max, I used to work with 3270
datastreams extensivly long ago and far, far away.  Never did get to work
with 16-bit streams or partitions though.

Many thanks for the enlightenment.

Peter

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] 
Sent: Thursday, October 27, 2005 10:51 AM
To: [email protected]
Subject: Re: TN3270 Emulator

Farley, Peter x23353 wrote:

>62x160 = 9920-byte buffer.  I thought I had read here and elsewhere 
>that there is a limitation of 8192 on the total buffer size?  Not so?

Time to crack open the 3270 manuals, Peter!

There are three kinds of addressing: 12-bit (max 4K buffer), 14-bit (max 16K
buffer), and 16-bit (max 64K buffer). Applications can do 12- and 14-bit
without batting an eye since the address formats are self-describing.16-bit
requires only slightly more work. Maximum buffer sizes notwithstanding, the
maximum number of rows is 255. The maximum number of columns is 255.

The limiting factor here is ISPF -- not 3270, not TSO, not some myth
regarding arbitrary screen dimension limits:

http://bama.ua.edu/cgi-bin/wa?A2=ind0501&L=ibm-main&P=R45606

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