Other non -PC hardware such as Rainbow went out to 896k
and some of the
S100
based machines did the full meg using shadow rom.
Two Tandy products that come to mind that could be take up to
768k are the Model 2000 and the 1000HX. The only real benefit for
doing it on either of them was for RAM disks though. Like the PCjr,
the 1000HX used part of it's RAM for the video adapter as well. Both
shipped with thier own specific versions of DOS 2.11.
Jeff
--
Collector of Classic Microcomputers and Video Game Systems:
Home of the TRS-80 Model 2000 FAQ File
http://www.geocities.com/siliconvalley/lakes/6757