HP 21mx/whatever processor works with doublesided key... i forgot model#

[COURYHOUSE at aol.com]

IT RUNS MEMORY RESIDENT  LOADED  FROM PAPER TAPE?
ED#
 
 
In a message dated 10/20/2017 7:37:48 A.M. US Mountain Standard Time,  
jwest at classiccmp.org writes:

"Forth-like" system that is well developed/flushedout. So in  addition to
BASIC, you get oh-so-many-wonderful-things. I very highly  recommend that
anyone messing with 21mx/1000 systems take a good look at  HP-IPL/OS.