Printer Port - (Lpt.com); Hard Disk - (Hdc.exe) - HP OMNIBOOK 5500 Service Manual

Printer Port -
(LPT.COM)
This test requires a parallel loopback connector to be connected to the
N
:
OTE
parallel port.
The Printer Port test checks the data port by writing and reading different bytes 1000 times. The
loopback connector is tested by toggling data bits 0 and 1 and seeing if the PE bit gets set.
Finally, all of the loopback connections are tested.
DOS Parameter Explanation
none
Valid Keystrokes Action
n/a The Printer Port test ignores the keyboard.
Failure Message Error Code
User Aborted
No loopback
No loopback
No loopback
Hard Disk -
(HDC.EXE)
The Hard Disk test verifies the presence of a hard disk, then reads/writes to the sectors. Within
the user interface of Diag, pressing the Enter key invokes a short test. The short test check 1%
of the cylinders and takes about a minute to complete. Pressing Ctrl-Enter runs the long test.
This checks 100% of the cylinders and takes about 1.5 hours to complete.
DOS Parameter Explanation
1, none Only test 1% of the cylinders
N Test N% of the cylinders
Valid Keystrokes Action
Esc Aborts the test, all other keys flushed.
Failure Message Error Code
User Aborted
Failed
Failed
38
Meaning
1 User aborted test.
3 Initial check for loopback
connector failed.
4 Data port test failed.
5 Loopback connector test
failed.
Meaning
1 Esc key pressed, or bad hard
drive
2 No hard disk
3 Hard drive controller failed.