DECstation 220 Diagnostic "Test for Shutdown return"

Rob Jarratt robert.jarratt at
Mon May 25 13:26:57 CDT 2020

According to a manual a friend has, the DECstation 220 outputs a diagnostic
code on the parallel port. If I have interpreted it correctly the code being
output by my machine is "Test for shutdown return". Does anyone know what
that might mean?





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