Technical data

3-66 Computer Group Literature Center Web Site
Test Descriptions
3
ACC1 - Device Access
Command Input
PPCx-Diag>NCR ACC1
Description
This procedure tests the basic ability to access the NCR 53C8xx device.
1. All device registers are accessed (read) on 8-bit and 32-bit
boundaries. (No attempt is made to verify the contents of the
registers.)
2. The device data lines are checked by successive writes and reads to
the SCRATCH register, by walking a 1 bit through a field of zeros
and walking a 0 bit through a field of ones.
If no errors are detected, the NCR device is reset; otherwise the device is
left in the test state.
Response/Messages
After the command has been issued, the following line is printed:
NCR ACC1: Device Access..................... Running --->
If all parts of the test are completed correctly, then the test passes:
NCR ACC1: Device Access..................... Running ---> PASSED
If any part of the test fails, then the display appears as follows:
NCR ACC1: Device Access..................... Running ---> FAILED
NCR/ACC1 Test Failure Data:
(error message)
Here (error message) is one of the following:
SCRATCH Register is not initially cleared
Device Access Error:
Address =________, Expected =________, Actual =________
Device Access Error: