[comp.sys.ibm.pc] EMS/LIM memory expansion

mmm@cup.portal.com (Mark Robert Thorson) (07/19/90)

Could someone explain to me what the Lotus-Intel-Microsoft memory 
expansion standard is?  If I'm not mistaken, it consists of I/O ports
located on memory cards which are used as page registers to allow
addressing a large amount of memory from a small-address bus.

Is this standard strictly applicable to XT-clones, or is it also used
on the AT?  Is a specification document available?  Is it only used
to remap the XT's 1M address space, or can it deal with the larger
AT address space?  What is the size of the remappable window?