Topic created on: August 29, 2008 19:15 CDT by gregben .

Just got started with IDA PRO 5.3.0.916 standard today. I have
no prior IDA PRO experience.

I'm using IDA PRO to disassemble the ROM image of
an industrial machine (designed circa 1985) that uses
an Intel 8085 processor.

This machine has a few i/o devices attached to I/O ports.
Typical instructions are:

out 9Ah
in 9Bh

I would like to replace the I/O port addresses 9Ah and 9Bh with
a more useful name like uart_data_reg or uart_status_reg as
appropriate. How is this accomplished using IDA PRO?

I tried to do this using the 'n' command, but get the error:
Can't rename byte as...(it is a tail byte)