NorthStar HORIZON Manual page 56

IS. With the computer power off plug the RAM board(s) into any
free connectors in the motherboard.
16. Turn on the computer power, and insert the personalized
HORIZON diskette into drive #1, referring to the GETTING
STARTED Section of the North Star System Software Manual for
correct diskette handling procedures. Close the drive door
and toggle the reset switch. One of three results will
occur:
A. The bootstrap program goes into the error loop as described
in step 13. This indicates trouble reading the data from
the diskette which can mean a bad diskette, a faulty disk
drive, or faulty read circuitry on the disk controller.
Return to the disk controller checkout instructions.
B. The bootstrap program loads the DOS but communication with
the terminal is not established. If the DOS gets as far as
the terminal I/O input routine, then pulses will be seen on
pin 46 (SINP) of the bus every three instructions. If you
detect these pulses, then the problem is with the terminal
or the serial I/O interface circuitry. Otherwise, if these
pulses are not observed, then the situation is more
complicated and is probably a result of an error in the RAM
memory.
C. The bootstrap program successfully loads the DOS and it is
possible to enter commands from the terminal.
Congratulations! Your HORIZON is now operational. It is
completely assembled and can communicate with a terminal.
The next step is to use the North Star software to more
fully check out your HORIZON. Refer to the GETTING STARTED
section of the North Star System Software Manual for
complete details.
North Star HORIZON Computer
56