🚀 go-pugleaf

In article <9789@ti-csl.CSNET>, herman@ti-csl.CSNET (Herman Schuurman) writes:
> > 
> >> Article <174200005@uiucuxc> From: karamich@uiucuxc.cso.uiuc.edu
> > | No version of DOS on the market (MS or PC) that i know of will allow >640K.
> > DEC Rainbows running MS-DOS have up to 896k of RAM.
> 
> TI Professional Computers running MS-DOS have up to 768k of RAM.  The
> only limit that MS-DOS puts on the memory size is the 8088 1MByte limit,
> although most machines running MS-DOS have some form of dedicated
> memory (such as ROM and display memory) in the upper address space.

My Fujitsu Micro-16s (MS-DOS 2.11) can utilize the full 1 Meg.  The
Fuji machine does all it's I/O using real "in" and "out" instructions.
The I/O address space that's used goes to 256 bytes of dual ported RAM,
which is picked-up on the other side by a 6809 micro that the box uses for
it's I/O Processor.  The 6809 has it's own 80k of RAM for buffers, graphics
primatives, etc, and handles the tube, keyboard, RS-232 ports, timers, etc.

Sure unloads alot of overhead from the 8-MHz 8086 CPU, which is one reason
the performance of the machine is so good when compared to PClones.  It
also means that most s/w that uses other than MS-DOS system calls won't
run ... or at least it wouldn't until a creative fellow up in Alaska
developed a board that provides ~95% PClone compatibility!  E-mail me if
you are interested in this board (for Fuji's only).

/kim

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[  Any thoughts or opinions which may or may not have been expressed  ]
[  herein are my own.  They are not necessarily those of my employer. ]