Digital Equipment DECstation 5000/100 Series, Maintenance Manual

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Model 100 System Registers
Data Buffers 3 to 0
The data buffers are general-purpose 32-bit read-write registers
used by the I/O control ASIC. For test purposes, these registers
can be read and written. Any DMA or access to a peripheral
device can overwrite these registers. To ensure proper testing,
disable all DMA engines.
Table E-7 lists the Model 100 system registers.
Table E-7. Model 100 System Registers
Register Console Address Description
SSR 0xBC040100 System support register
SIR 0xBC040110 System interrupt register
Mask 0xBC040120 System interrupt mask register
MER 0xAC400000 Memory error register
MSR 0xAC800000 Memory size register
EAR 0xAE000004 Error address register
Use the e command to examine the contents of a Model 100
system register from the console. Enter the e command in the
following format:
e
[ options ] [ console-address ]
See Appendix C, ‘‘Console Commands,’’ for information about
the formats and options used with the e command and the other
console commands.
E–16 CPU and System Registers