3-10
Testing
and
Troubleshooting
During system initialization
all
mapped-out blocks of
RAM
on
each memory controller are checked.
If a
mapped-out
block
is
non-functional, the message
Heal
e
rOve
rf
I
ow
on
Me
#N
is
displayed.
After system initialization
is
complete
and
the computer
is
in
use, additional memory error manage-
ment
is
performed. The operating system reports the memory controller
number
and
the
RAM
location
~hen
a double-bit memory error occurs.
Printer
The self-test supervisory code verifies the printer's connection to the
110
bus at powerup. It then
reads the self-test status register. The code issues a message to the user
if a failure
is
detected.
Keyboard
The self-test supervisory code tests registers
on
the keyboard.
110
bus interconnect
is
tested via a
special register
on
the keyboard. Data
is
written to
and
read from this register (loopback). Interface
control lines are tested
and
keyboard self-test results are obtained by writing a
command
to the
keyboard which causes
it
to report self-test results.
The code issues a message to the user
if
a failure
is
detected. System diagnostics perform further
tests of the keyboard electronics.
Display Interface Module
(DIM)
The
STSC
tests the
DIM
interface to the
110
bus
and
initiates the self-test of the line buffer chip. The
code also tests the display buffer memory. The code issues a message to the user
if
a failure
is
detected.
98760A
Display Alpha and Graphics
The
STSC
tests the alpha/interface board
and
the graphics/digital video board. The test initializes
the alpha controller
and
checks status. It performs alpha memory tests with four patterns:
all
0'
s,
all
l'
s,
alternating
l'
sand
0'
s,
and
alternating 0'
sand
l'
s.
The test checks graphics status
and
initializes the monitor. It checks the three memory functions: set,
clear,
and
complement.
It
tests the vector generator
in
the graphics controller
and
then writes eight
small vectors into each memory plane
in
each of the three memory functions. The test reads the
words
and
checks them.
The
STSC
continually checks for timeout errors
in
both
DMA
and
direct
110
modes. The
code
issues a message to the user if a failure occurs.
9130K Flexible
Disc
Drive/Controller Card
The
STSC
tests the
110
bus
and
the 9130K controller card interface to the lOP. After verifying bus
integrity, the
code
reads self-test status from the controller card's self-test register. The
code
issues a
message to the user in case of a failure.
Winchester Fixed
Disc
Drive/Controller Assembly
The
STSC
tests the
110
bus
and
the controller assembly interface to the lOP. After verifying
bus
integrity, the
code
reads self-test status from the controller assembly's self-test register. The
code
issues a message to the user
in
case of a failure.
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