Using The Test Binary Cartridge Only; Processor/Memory Control Test; Initial Memory Test; Rom And Readlwrite Memory Tests - HP 9845B/C CE Handbook

9845B/C Diagnostics 5-5
Using the Test Binary Cartridge Only
Install the cartridge and press:
LOAOB IN" TB IN"
EXECUTE. Two modes are possible de-
pending on the position of the auto start key.
Mode
Automatic Run Mode
Operator Mode
Mode Determined By
Auto Start Key Down
Auto Start Key Up
Tests Are
Run automatically using the
automatic rack test sequence
Selected by the operator
Press the STOP key to exit the automatic rack test and enter the operator mode. The tests
available on the cartridge are listed in Table XX.
Processor/Memory Control Test
The processor/memory control test is run immediately after the test ROM receives control of the
system. The test includes:
• Binary Instructions test.
• Input/Output Controller test.
• Mathematics Chip test.
• Memory addressing test.
An error will abort the test, preserving the error condition. If possible, error messages will be
displayed. The computer beeps and displays:
PPU TESTED
LPU TESTED
BLK 0 SA-OOOOao EA-077777
when the test is complete.
Initial Memory Test
The initial memory test is run automatically after the processor test. It tests the areas of memory
needed to load and run the binary programs from the test cartridge.
Specifically:
• Unique block test determines if any block is answering to two block address.
• Block 1 PPU read/write test.
• Block 0 LPU read/write test.
An error will stop the test, preserving the error condition.
Press the STOP key to exit this test.
ROM and Read/Write Memory Tests
General Information
The test binary is originally loaded into block O. When memory tests are performed on block 0,
the binary is transferred into the next highest block available which has no error. If the binary
cannot be transerred into another block, then
"UNABLE TO TEST BLOCK 0"
is displayed.
The test binary uses block 1 for basepage read/write locations. When testing block 1, these
basepage locations are temporarily transferred to another block. If the transfer cannot be made,
"UNABLE TO TEST BLOCK 1"
is displayed.
I