🚀 go-pugleaf

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I have a problem which should be a piece of cake
for you ST hackers out there.

I want to write a simple TOS terminal communications
program with a split screen.  In the upper half of the screen
I will display the input from the RS-232 port.  At the same time,
the user should be able to enter characters at the keyboard which
will be stored in a buffer for later transmission. I want to
display the typed data in the lower half of the screen while the
upper half is displaying the data received at the RS232 port.

What is the best way to do this?  I have been fidelling with the
Setscreen call, but my documentation (MWC + Abacus) lacks
sufficient information on the layout of the memory block passed to
this call.  In some of the source code I've seen, I've seen
Mallocs with a size of (32*1024) + 256.  I presume this maps to the
screen somehow, but what is  the precise mapping?  Can I mix the two
screens? For example, suppose I define screen2 as 16*1024 + 256.
Will this only print out in the upper (lower) half of the screen
while the other half remains intact?

Any info on this will be greatly appreciated. Thanks.