🚀 go-pugleaf

phil@amd.com (Phil Ngai) writes:

pm>I've already posted about deficiencies with regard to the NEAT
pm>implementation of EMS 4.0 on a 286. (did I mention that in a 4 meg
pm>system, the extended and expanded memory is allocated in chunks
pm>of 1 megabyte?) 

pm>I figured the best solution to that issue was to go for a 386 or
pm>386sx. NEAT still isn't! As far as I can tell, the top 384K of the
pm>first meg is only usable for shadow RAM. In the 286 world, I am
pm>used to that 384K being remappable to extended memory. Not so with
pm>a 386 NEAT.  If you didn't want shadow RAM for some reason, that
pm>384K is totally unrelocatable and therefore wasted. Even if you did
pm>want 64K or 128K of shadow RAM, you don't want it for your EMS
pm>pageframe, so that 64K is wasted. Etc.

pm>Are there other chip sets which are known to not be so wasteful
pm>of RAM?

The new products from Quarterdeck (QRAM for 80286s with C&T
chipsets and QEMM-386 V5.00) are supposed to get around the
shadow RAM problem, making this memory available as expanded,
extended or "high RAM" (above 640K).

bradley.grigor@canremote.uucp  :  ALEX is coming to Toronto in April.
Newmarket, Ontario, Canada     :  TelePoker will be there - will YOU?
---
 ~ DeLuxe 1.11 #4613  Get high -- lick a toad!