Dataman S4 Manual page 16

DATAMAN S4 MANUAL
Sending files back is often not so easy. Computers
seem to implement
handshaking properly on output, but not on input.
It is surprisingly
difficult to get any information on this subject: the
manufacturer's
data tells you the names of the signals, but does
not tell you that
they do not work. Experiments show that the input
buffer overflows
at some point, usually at 64K, when the system
transfers the buffer
contents to disk. 64K characters is not 64K bytes,
because a HEX
file contains two ASCII characters for every data
byte plus addresses,
checksums and other odds and ends. In fact it is
more like 26K bytes. For
small PROMS this is enough. It is possible to
send the whole 64K
as 3 chunks, then patch it together with a word-
processor and take
out the two spurious End-of-File lines. A much
better solution is
to use some kind of COMMS or TERMINAL
program.
Terminal Emulating Programs.
A TERMINAL sends the information you type at
the keyboard through
the serial port. It displays what comes back
through serial port
on your screen. When S4 is connected to your
computer running a terminal
program, it might seem that what you type appears
on your screen:
16<$IComputer Operation>Computer Operation<$&Computer>