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This article describes a technique which allows a read-only storage (ROS)-based system to utilize timely diagnostic updates without requiring the release of another ROS unit to the field.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
66% of the total text.
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This article describes a technique which allows a read-only storage (ROS)-
based system to utilize timely diagnostic updates without requiring the release of
another ROS unit to the field.
When I/O devices use relatively new technologies, service costs
and time have serious impact on the cost/performance of the using
products. Therefore, as new diagnostics are developed, i+ becomes
imperative to make them available to the field on a timely basis.
Changes are normally implemented and made available via I/O loadable
programs (i.e., on some form of magnetic media). However, on systems
without such input capability, this method of update is not possible.
These systems depend solely on the level of diagnostics contained
in their ROS. This is an obvious limitation.
Our technique is accomplished by creating in the ROS a special diagnostics
group which allows diagnostic programs to be executed out of random-access
memory address space.
The latest level of diagnostic programs is located in the random-access
memory space via an electronically programmable read-only memory (EPROM)
card which plugs into the existing random-access memory sockets on the system
This diagnostic group is accessed by the Customer Engineer's (CE) selection
of a designated test family. Software recognizes the special test family and
branches to the predetermined random-access memory address to begin
executing the program located on the EPROM card.