🚀 go-pugleaf

I am having trouble communicating over the communications port of the
VAXstation 2000. The port is allocated from a window on the vaxstation
and set with the correct parameters for XON/XOFF I think. I open the port
as a file from a C program with fopen(f2, "tta2:") where f2 is a file
pointer and tta2: is the name of the port. I talk to a 68020 board by 
sending messages out the port and reading from the port for its response.
I have no problem sending large messages (>512 bytes) out the port, but if
the 68020 board tries to send something larger than 512 bytes the port
seems to eat everything that came before the 512th byte. I read the port
with fgetc(f2, c) and find only the trailing part of the message. I hooked
a serial line analyzer to the port and the message is coming across. At the
511th byte the port generates an XOFF followed by an XON. Does anyone have
an idea what is going on or why the port would eat the beginning of the
message ? I am considering limiting message sizes to less than 512 but would
rather not have to change the code I have written so far.

Thanks in advance,
Brian Holland
Mitre Corporation
bjh@mitre-bedford.arpa
bjh@linus.mitre.org
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Brian Holland                    bjh@mitre-bedford.arpa  (alt: bjh@linus)
VHSIC Technical Center-CAD Section
The MITRE Corporation; MS E095; Bedford, Ma. 01730; tel: 617-271-3789