Type 270 disk file on PDP-6

Eric Smith spacewar at gmail.com
Sat Mar 12 22:52:03 CST 2016

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?  :-)

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