Timesharing/multiuser BASIC for MC68K

On Mar 20, 2017, at 2:20 PM, Joseph Zatarski via cctalk <cctalk at classiccmp.org> wrote: I just wanted to share a little project I've been working on, it's an adaptation of Lee Davison's EhBASIC to become a timeshared multiuser BASIC. There's still a bit more to do, but here's a video of it in operation: https://youtu.be/SAJpHiBPMcQ In that video, it's only running 3 sessions (I had no convenient 4th terminal) but it's capable of running 4. It is a very very simple preemptive multitasking 'kernel' providing I/O services and performing periodic context switches for the instances of the interpreter. It only runs a fixed number of processes, and all the process memory is statically allocated. EhBASIC lends itself well to this, the code is position independent by design, and the memory range is passed in. Everything is dereferenced relative to the 'start of memory' pointer. This means no need for an MMU or relocation. I'm hoping to set this up at VCF MW in September, running 4 terminals. More info on the hardware I'm using is available here: https://hackaday.io/project/6150-beckman-du600-reverse-engineering Pictures: https://www.dropbox.com/sh/uw6cjqigk2sdwdy/AAAwP55aelyzrYeP1HVUDdMqa?dl=0 And another software project I'm working on as well (a ROM monitor program): https://github.com/jzatarski/Joe-Mon