1 Jul
2013
1 Jul
'13
5:10 p.m.
You could only address 65520 additional bytes in realmode by ungating A20 on a 286/386
which I assume is what you meant - just a typo
-Alanl
Sent from my iPhone 4S
On Jul 1, 2013, at 7:40 PM, Fred Cisin <cisin at xenosoft.com> wrote:
On Mon, 1 Jul 2013, Perlpowers wrote:
PS: Are you sure it's 512MB and not 512KB? I
don't think I've seen 286
address that much RAM.
"Normal" 286 (and 386-SX) could address 16M.
386-DX and above could handle more.
"REAL" mode could address up to 1M with 20 address bits, and up to 1M plus
655220 bytes of memory, with A20 support.
Memory past 1M was called "Extended" (XMS).
It was, at least theoretically, possible to go past 16M with "Expanded"
memory (EMS) What was the max for the LIM (Lotus-Intel-Microsoft) EMS
standard?