I have one of the NC4016 boards ( I forget which one ). I added a XT floppy controller and a XT MFM disk controller. I made some other hardware for doing byte stuff faster. Using address -1, I could access it faster as a short literal. I had a 8 bit barrel shifter there. It came in handy for the XT controllers. The processor was fast enough that I had to add delays to the code to the floppy controller. It would run faster than the floppy controller could provide status. Still, I was using it with direct processor access and the controller was really expected to be used with a DMA transfers in a XT computer. The MFM hard drive controller was much easier to deal with. National also had a bunch of stackable computer modules. One of these modules had the NSC800 processor with a Forth ROM built in. Rockwell liked Forth and used it quite a bit in their development system as well as having it on their AIM 65 machines. Dwight
________________________________ From: cctalk <cctalk-boun...@classiccmp.org> on behalf of TangentDelta via cctalk <cctalk@classiccmp.org> Sent: Sunday, October 25, 2020 5:29 PM To: General Discussion: On-Topic and Off-Topic Posts <cctalk@classiccmp.org> Subject: Re: R65F11 Rockwell also had an RSC-FORTH Kernel and development environment ROM set for the R6501Q, which is a similar 6502-based processor meant for embedded applications. http://www.smallestplcoftheworld.org/RSC-FORTH_User%27s_Manual.pdf Here's the RSC-FORTH manual, which covers the different types of RSC-FORTH.
