17 Nov
2011
17 Nov
'11
9:45 a.m.
Al Kossow wrote:
On 11/16/11 9:43 PM, Chuck Guzis wrote:
The DEC PDP-6 and the KA10 (the original PDP-10 CPU) were async;
http://www.inwap.com/pdp10/usenet/emulators
I also recall that the Philco System 2000 was one
of the few
commercial versions utilizing that idea. "Asynchronous" was part of
their advertising campaign--and, for a very short time, they had one
of the fastest transistorized machines.
I have been told that the 2000 was also unreliable because of this. From: "Carl R. Friend" <carl.friend at
stoneweb.com>
....
The PDP-6 (the -10's progenitor) and the KA-10 were asynchronous
machines, the KI-10 was a synchronous time-state machine, and the
KL- and KS-10 were microcode implementations (pretty much by definition
synchronous).
The PDP-6 was a cranky beast, with large boards that were prone to failure.
Scanned schematics of the PDP-6 are at
http://web.archive.org/web/20041209120010/http://www.ai.mit.edu/people/tk/p…