31 Dec
2000
31 Dec
'00
5:34 a.m.
With such machines, having more than 640K RAM is not
that uncommon. I
have an Apricot with 960K RAM (the remaining 64K in the 1Mbyte address
space of the 8088 is the video RAM and BIOS EPROMs). And yes, MS-DOS on
that machine uses all the available RAM.
TRS-80 Model 2000's can easily be expanded up to 768k, though
I no longer remember exactly how it's version of MS-DOS 2.XX used the
additional memory other than as a RAM disk. On a standard Tandy
machine with Tandy parts, you could have 256k on the mainboard and
two 256k expansion cards in the card chasis. I believe Envision
Designs had a modification that allowed 896k total (256k on the
mainboard and one modified RAM expansion card with 640k on it). The
graphics card didn't share any of the system RAM.
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