12 Mar
2016
12 Mar
'16
8:52 p.m.
I just was looking at the I/O device code assignments in the 1973
DECsystem-10 System Reference Manual, and happened to notice the entry
for the Type 270 disk file used on the PDP-6.
PDP-6 and PDP-10 device codes are three octal digits, of which the
third digit can only be 0 or 4.
The device code for the Type 270 is octal 270. Coincidence? :-)