If the .ent file has only CR at the end of each line (no LF),
then set your terminal emulator to delay 100ms after the end
of each line. The .ent file can then be sent at 9600 baud.
Otherwise, the transfer will have to take place at 1200 baud.

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The utility hex2ent converts Intel hex files into .ent files.
The .ent file created has only a CR at the end of each line.

hex2ent can also be used to strip line feeds from an existing
.ent file. For example, the command "hex2ent program.ent"
creates the output file "program-NOLF.ent" that is program.ent 
with only a CR at the end of each line.