On 8/18/2015 7:46 AM, Paul Koning wrote: > >> On Aug 17, 2015, at 10:48 PM, Jay Jaeger <[email protected]> wrote: >> >> BR level is the bus request level for an Interrupt. BR 4 is typical. > > On Unibus machines, more of the BR levels were used. The rule of thumb was > BR4 for slow devices (like terminals and printers), BR5 for fast devices > (disks and tapes), BR6 for real time critical devices (clock, also DECtape > because you had to respond to a “read block number” interrupt fast enough to > start reading the block before it passed over the heads). BR7 could in > theory be used by devices but I don’t believe it ever was in practice. > > paul >
Yes, but this discussion regards an RLV11. JRJ
