I think I am going to give it a try. I think am going to start with a Straight-8 simulator for proof of concept. Would this be worth releasing as well? Then I will start on the PDP-5. I hope there people that would willing to answer my questions and in the beginning there will probably be a lot!
Thanks Ray On Tue, Aug 13, 2019, 9:08 AM Paul Koning <[email protected]> wrote: > > > > On Aug 12, 2019, at 10:17 PM, Johnny Billquist <[email protected]> wrote: > > > > ... > > The PDP-12 poses a more interesting problem, as it is a dual CPU thingy > with shared memory and two totally different instruction sets, but some > interaction between them... > > I've never programmed one but I have a handbook somewhere, so from that > memory: it's not a "dual CPU" in the usual sense of two separate engines > running in parallel, interconnected by memory or by I/O channels. Instead, > it's more like compatibility mode in early VAXen, where you can flip > between two instruction sets through a mode control. So the basic > structure of a SIMH cpu simulation is unaffected; what changes is that > there are two sets of opcode interpreters. > > The I/O devices are also different; LINCtape is physically very similar to > DECtape but the programming interface is rather different (significantly > more advanced -- if I remember right, it will search for the requested > block for you rather than putting that job in the driver software). > > paul > > _______________________________________________ > Simh mailing list > [email protected] > http://mailman.trailing-edge.com/mailman/listinfo/simh
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