On 10/25/2010 8:13 PM, Dave McGuire wrote: I sent Skeeter (the seller) my $0.02 worth, which is that this is a control store (as the boards say) for 2901 development. I think the 8080 and other logic is support system logic to support loading of this and probably controlling the debug assets for the system under test. We used systems from HiLevel in Irvine which were much larger and advanced than this system is. Note the 79 and 80 date codes on the 8080's in the system which fits for early 2901 development (or it was for me). I worked with Ultimate which had 16 and 32 bit systems based on the 2901. Honeywell did the hardware based on their disk controller design, which had all the DMA access, and the 2901 boards were coprocessors plugged into Level 6 systems. Don Woods of adventure fame was one of the engineers, from what I heard on that system. The big problem in that time was development tools, which was usually some sort of assembler, and then writable control store. I'm sure there were lots of ways to control the micromachines being debugged, both thru the 2901, and by added logic to do such debugging. Jim

Hi I also wouldn't call it a clone. I don't think Intel would have ever made a deveopment system for 2900's. Many of the multi-bus boards were almost direct copies of Intel boards. Both AMD and National made Multi-bus boards even though the where Intel competitors. Dwight