On Thu, Oct 3, 2019 at 05:01 PM, cmdrcosmac wrote:
covers in excruciating detail, the business of a "binary loader" that can be toggled into a COSMAC's RAM, to read EF3 serial data. Then one can load some monitor through a serial or USB to serial port. It's about 30 bytes of loading code; kinda tedious, but you knew that going in, right? ;)
If you need to build a serial hardware interface, that's covered in a number of documents on my Web site; an index to them is linked-to as "hardware" on the "binloader" Web page.
For the most part, however, most COSMAC owners replicate and burn a ROM from some COSMAC product and run that, with the serial interface of that product. So there's not been much development of toggle-in serial loaders over the last several years. (Parallel or Arduino loaders have had some development. Web search is your friend to find those; even on my Web site.) USB-to-serial dongles, have become cheap and usable under various "pee-cee" operating systems. I cover them too, on my Web site. Web search will find content on my site, if you add the phrase "site:retrotechnology.com"