19200-baud Serial Boot Loader for TRS-80 Models 3/4/4P
SBOOT4 v1.0 -- Serial Boot Loader for TRS-80 Model 4P
Copyright (C) 1999, Douglas Beattie Jr.
Usage: SBOOT4 hexfile [ comport ]
Serial boot at 19200 baud.
SBOOT4.EXE transmits an Intel HEX file to your TRS-80 Model 4P, at
19200 baud, using the Model 4P built-in "serial loader" ROM.
SBOOT4 converts the Intel HEX file to TRS-DOS Load Module Format (LMF)
as it sends it. To use this program you will need a TRS-80 Model 4P,
Null Modem, and a RS-232 cable. Radio shack has Null Modems and
cables. Use a RS-232 Male-Female cable (extension cable).
The TRS-80 Model 4P can be started in Serial-boot mode by holding down
the right shift key and pressing reset -- hold the shift key until you
see "Not Ready" on the screen. (Depending on the initial state of your
COM port, you might see "Ready")
For example, if you have a null modem cable on COM3: and your Model 4P
is reset in Serial-boot mode, you can use the following command.
SBOOT4 SCRDUMP.HEX 3
to load the file. (note: the program defaults to COM2:)
Also included is an example HEX file (Z80 source code included), which
you can use to test your hardware setup.
Get the 'Model 4P Serial Bootloader
(SBOOT4V1.ZIP, 18K) and give it a try.