Furuno FELCOM 12, Service Manual

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2. Communication Unit
The system program for the CPU2 in the communication unit is stored onto the flash
ROM U26 on the CPU Board. Updating the software is made as follows.
*Program Number for CPU 2: 16501181XX
U26 contains loader program and system program.
Procedure
1. While pressing and holding down [Alt] and [Fn], press [F2]. "OK to quit system
Yes/No" appears.
2. Select "Yes" with the cursor and press [Enter].
"A: > FELCOM12", MS-DOS prompt display appears.
3. Insert the floppy disk which contains CPU2 system program.
4. Type [B] [:] and press [Enter]. The prompt "B: >" appears.
5. Type [U] [P] [F] [1] [2] and press [Enter].
The message "About to update FELCOM12 CPU2 software. Press 'Y' to update the
software to 165-0118-1xx. If you wish to cancel, press 'N' key" appears.
6. Press [Y].
"Loader Version 6.00 Erase wait: 0 sec Write wait:0 Wait counter = 100
TARGET power ON" appears.
7. Turn off the communication unit and turn it on again.
"Execute STEP1, Execute STEP2, 233096 byte transfer Now Erasing
xxx percent completed" appears.
Note)
xxx changes from 000 to 100.
8. After about 5 minutes, erasing will finish with the following indication.
"Finish version update.
B: >"
9. Turn off the terminal and communication units.
10. Insert a working floppy disk.
11. Turn on the unit.