Rom Checksum Test; K15 Run Operating System - HP 9845B/C CE Handbook

9845B;C Diagnostics
5-15
kl0 ROM Checksum Test
The ROM checksum test is a part of the kID choose rack test and the k11 automatic rack test.
The contents of each option and system ROM are read and a checksum for each ROM is
computed. If the checksum for a particular ROM is all zeros, the ROM is not there. if the
checksum is all ones, the ROM is correct. If the checksum is other than all ones or zeros, a
checksum failure is displayed in the following form.
ROM CHECKSUM FAILURE BlK X ADDRESS YYYYYY - ZZZZZZ
x
=
the octal block number
YYYYYY
=
the ROM starting address
ZZZZZZ
=
the ROM ending address
Press (
CONTINUE)
to continue the test after an error occurs.
Refer to memory map for ROM locations.
Refer to the appropriate sections in this chapter for test descriptions.
kll Automatic Rack Test
This test is used to exercise the computer over an extended period of time. The k11 rack test
runs the following tests continuously.
• System and Option ROM checksum test
• Graphics memory test
• Tape cartridge exerciser tests (TIS and T14)
• Printer tests
• Read/write memory tests!
Note
The tests are performed only if the options are installed, otherwise,
the tests are skipped. Likewise, if the printer has no paper the printer
test will not be performed and if a tape cartridge is not installed the
cartridge drive test will not be performed.
Press
CO
to skip a test and continue with the next test. This test starts automatically if the
auto-start key is depressed when the computer is switched on or power is recycled. Refer to the
appropriate section in this chapter for test descriptions.
k15 Run Operating System
This special function allows you to return to normal computer operation. When using only the
test binary cartridge, press
c:§J
to exit the tests and return to the 9845 operating system.
Before returning to the system, however, the LPU/PPU is tested for BASIC language functions.
Directions and prompts are displayed on the CRT.
If ROM checksum errors occur, or if the system ROMs are not
present~
the follOWing error
message is displayed:
WILL NOT JUMP TO SYSTEM. ROM ERROR
Press any key after an error to exit this routine.
I