AT&T 3B2 Off-Line Diagnostic Manual page 463
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Also See for 3B2:
- Maintenance reference manual (422 pages) ,
- Operation manual (415 pages) ,
- Manual (54 pages)
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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Phase Descriptions
Phase #10 -
EPORTS -
Programmed Input/Output (PIO)
Byte Transfers
Phase Name:
Type:
Function:
Tests:
Time:
Warnings:
Phase #10 Tests
EPORTS -
PIO Byte Transfers (pio_I)
Demand
This phase tests byte transfers to the 3B2 computer I/O bus.
Tests 1 through 8 -
verifies the operation of the I/O bus interface.
80 seconds
None
Test Numbers:
1 through 8
Function:
These tests verify the operation of the I/O bus interface.
Procedure:
Write a one through a field of zeros in all memory locations of a page of
System Board (SBD) RAM.
Hardware Tested:
The EPORTS interface to the 3B2 computer I/O bus is tested.
Data Returned:
The data returned are the test count that failed, the address of the failure, and
the data pattern that failed. The test count is the bit that was written. The
address is represented as
Ox89????
Notes:
Walk a one through a field of 8 zeros is the value written to the memory
location.
EPOATS DIAGNOSTICS
9-19
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