25 Feb
2021
25 Feb
'21
11:47 p.m.
Rich Alderson wrote:
As for operating system support, the only DEC
operating system which
could put tapes and disks on the same Massbus was TOPS-20. Tops-10
explicitly tells you in the SYSGEN process that disks and tapes must
reside on different channels; I believe that ITS follows that same
principle.
KS10 ITS has MIT hacked microcode for IO instuctions hardwired to use
UBA 1 for disk and UBA 3 for tape.
KA10 and KL10 ITS have TM10 I/O bus tape controllers, optionally using a
DF10 channel.