| 摘要 |
The internal states of one or more micro-code storing RAMs (random access memories) which control program flow in a digital data processor are made accessible for loading, changing or monitoring purposes using variable mode multi-bit shift register storage devices for the input-output register of each RAM. When the contents of a selected location in a RAM is to be monitored, changed or loaded, the data stored in the selected location is read into the RAM's input-output register and the interconnections of the corresponding storage devices are reconfigured to form a serial string along which the bits in the string are shifted to a monitoring unit for monitoring, diagnosing, changing and/or loading purposes and then returned, via the string, to their original locations in the RAM's input-output register. If changes are required, the changed bits returned to the RAM's input-output register are written into the selected location in the RAM before normal operations are resumed.
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