AT&T 3B2 Off-Line Diagnostic Manual page 399

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Phase #11 - PORTS-PIO Byte Transfers
Phase Name:
Type:
Function:
Tests:
Time:
Warnings:
Notes:
PORTS - Programmed Input/Output (PIO) Byte Transfers (pio_1)
Demand
This phase tests the PORTS interface to the 3B2 computer I/O bus.
Test 1 - tests the data pattern Ox01 at every address in a page of SBD
DPDRAM.
Test 2 - tests the data pattern Ox02 at every address in a page of SBD
DPDRAM.
Test 3 - tests the data pattern Ox04 at every address in a page of SBD
DPDRAM.
Test 4 - tests the data pattern Ox08 at every address in a page of SBD
DPDRAM.
Test 5 - tests the data pattern Ox10 at every address in a page of SBD
DPDRAM.
Test 6 - tests the data pattern Ox20 at every address in a page of SBD
DPDRAM.
Test 7 - tests the data pattern Ox40 at every address in a page of SBD
DPDRAM.
Test 8 - tests the data pattern Ox80 at every address in a page of SBD
DPDRAM.
40 seconds
None
This phase performs PIO (write and read) in bytes. If any test in this phase
fails, the following hardware may be faulty:
• INTEL 80186 Microprocessor
• INTEL 80186 Microprocessor interface to the PORTS Address/Data bus
• PORTS interface to the 3B2 computer I/O bus.
PORTS DIAGNOSTICS 8-21