>> Bruce writes:
>> > QEDIT also has to deal with an MPE
>> > limitation: large windows result in large block transfers, which don't
>work
>> > in VT (over a network).
 
Mike Casteel replies:
>There is a limitation on the size of a single read over VT due to
>protocol/implementation restrictions, and a limit on serial size due to
>QEDIT. I'd expect buffer size limitations in both cases. I used to have a
>slip of paper with the numbers written on them on my desk, but it's lost
>now. I got them from Robelle (and they may have updates, anyway). There may
>also have been a change in 'streams mode' vs 'message mode' VT.
 
According to the Qedit 4.3 manual this limit is 6,000 bytes. In beta version
4.3.14 this was increased to 12,000 bytes (but this includes the template
line and other highlighting so it is effectively around 10,000 bytes, this
is also only on MPE/iX version).
 
These limits become a problem when you have wide files and a version of
Reflection that allows scrolling to see the entire file. i.e. R1/DOS and
now R1/Win 5.0.  The beta version now reduces the screen buffer when it
detects that it exceeds the 12,000 bytes.  i.e. /Set Visual Below and Above
are reduced.