WOW!! I Have one of those ETI boards, and I based my final Electronics Engineering project on its big brother, the 65F12. 1800 MEMTOP command before using the disk. ETI Suggested that it was because the system had to know where the top of memory was, but it was because of a bug in that version of the kernel. The 65F11 had all of the headless primitive in kernel rom, and used a development ROM that contained the higher level words. I Loved the concept, but the silicon was expensive and as it turned out, rara. Nobody knows anything about these chips. At Uni, we hav Novix NC4016 dev boards with FDD support - they were FAST... One cycle could see the CPU read the next instruction, write a byte to the stack, and write a byte to I/O - all because it used three (or 4) separate busses. I'm here in Australia, and would merrily give it a home. :-) Kindest regards, Doug Jackson em: doug at doughq.com ph: 0414 986878 Check out my awesome clocks at www.dougswordclocks.com Follow my amateur radio adventures at vk1zdj.net ----------------------------------------------------------- Just like an old fashioned letter, this email and any files transmitted with it should probably be treated as confidential and intended solely for your own use. Please note that any interesting spelling is usually my own and may have been caused by fat thumbs on a tiny tiny keyboard. Should any part of this message prove to be useful in the event of the imminent Zombie Apocalypse then the sender bears no personal, legal, or moral responsibility for any outcome resulting from its usage unless the result of said usage is the unlikely defeat of the Zombie Hordes in which case the sender takes full credit without any theoretical or actual legal liability. :-) Be nice to your parents. Go outside and do something awesome - Draw, paint, walk, setup a radio station, go fishing or sailing - just do something that makes you happy. ^G ^G ^G ^G ^G ^G ^G ^G- In more laid back days this line would literally sing ^G ^G ^G ^G ^G ^G ^G ^G On Mon, 26 Oct 2020 at 05:41, Will Cooke via cctalk <cctalk at classiccmp.org> wrote:

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-bounces at classiccmp.org> on behalf of TangentDelta via cctalk <cctalk at classiccmp.org> Sent: Sunday, October 25, 2020 5:29 PM To: General Discussion: On-Topic and Off-Topic Posts <cctalk at 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.