It was written...
It's cool because there wasn't a single
macroinstruction set.
The operating system and every language had its own pagable
microcode.
Ok, now THAT is cool. Pageable on the fly? Nifty. Reminds me of a
Microdata
Reality M1600 that I had many years ago. The ROM board had been replaced by
an EEPROM board, and you could change the macroinstruction execution (and
define new ones). But that was a special development version of the system.
The Burroughs is production. Way cool.
Jay