On 01/01/2018 03:33 PM, Noel Chiappa via cctalk wrote: > > From: Paul Koning > > > The only asynchronous computer I can think of is the Dutch ARRA 1 > > Isn't the KA10 basically asynchronous? (I know, it has a clock, but I'm > not sure how much it is used for.)
This was my understanding, as well. More recently there was the AMULET processors designed at the University of Manchester. https://en.wikipedia.org/wiki/AMULET_microprocessor One of the stories I read about the AMULET was that they wrote a little program to blink an LED where the timing was determined by a busy loop. If they sat a hot cup of coffee on the processor, the light would blink slower; a cup of ice water and it would blink faster. If this were a different group, I might suggest that this points the way to designing computers that transition gracefully in Vinge's Zones of Thought but I'll just leave that digression alone. The Advances Processor Technologies group at the University of Manchester also came up with the Balsa language, an HDL for asynchronous design. When I started working on my own PDP-10 implementation, I began by writing it in Balsa, thinking I wanted it to be a follow-on to the KA10. I'm still interested in asynchronous design but I've let that implementation go for the moment.
