A n - open address register (0-6) B - set breakpoint C addr - continue program D n - open data register (0-7) E addr - open 16 bit word at address G addr - start program I mode - set uart mode K - soft reset L cmd - send command to host (implicit I B M map - open setment map register O addr - open 8 bit byte at address P page - open page map register R - open misc registers S s-record X char - set char for transparent modeThe Uart mode stuff expects port B to be connected to a host computer. Think of it this way. The Callan served as a sort of "super terminal" in the day, with some big machine on port B. port A was connected internally in the Callan to a built in terminal. So transparent mode was a pass through from the Callan terminal on A to a host on B. Almost none of this is relevant today, at least for me with the Callan terminal long gone and forgotten.
Opening a location is to display it and allow you to modify it. If you don't want to, you hit return and you move on to the next location. I type a "." (period) to stop all this.
You can download S records by hand, but I wrote a python program to automate loading a batch of them and then running the downloaded program.
Tom's Computer Info / tom@mmto.org