Reproducing old machines with newer technology

On 07/14/2015 12:55 PM, William Donzelli wrote: Perhaps not, but they were unique in their implementation (one "logic core" multiplexed among 10 memories and register sets) and the application os same. Prior to about 6000 SCOPE 3.4, most of the OS logic was present in the PPUs, not the CPU. IIRC, in SCOPE 3.3, the only CP part of the OS was the storage move program. PPs communicated among themselves and used numerous "overlays" to accomplish the supervisory funciton. You could have the CP at a dead stop with the OS happily ticking along. SCOPE 3.4 moved more of the functionality I don't think that was ever done with earlier machines. In contrast, almost none of SCOPE 2 for the 7600 was in the PPs, which had access only to pre-assigned buffers in CM (or SCM if you will). 7000 SCOPE was implemented using an interesting system of overlapping field lengths, such that the user program was the innermost. I've never heard of an operating system, handling all job supervisory functions and I/O in a S/360 channel. --Chuck