HP 9030 CE Handbook page 88

9030/40 Diagrams
9-23
I/O Backplane Signal Definitions (Continued)
Signal Definition
NSTS 110 bus status (negative true).
NSWO Select code switch 0 (negative true).
NSWI Select code switch 1 (negative true).
NSW2 Select code switch 2 (negative true).
NSYNC Synchronize (negative true).
NUAD Your address; slot/select code select (negative true).
NWAIT (Not used)
PPON Primary power on; all outputs in spec.
READ I/O bus data direction (positive true; high indicates data to lOP).
SGND Safety ground.
SPON Same as PPON.