PWB's Use of Expanded Memory

ID Number: Q66308

1.00 1.10

MS-DOS

Summary:

The DOS version of the Programmer's WorkBench (PWB) will utilize

expanded memory to swap its own segment overlays if it detects that

expanded memory is available in the system. When PWB needs a new

overlay, the existing overlay in memory is first copied into expanded

memory. If there is not enough room in expanded memory to copy the

overlay, the least recently used overlay is discarded to make room for

it. This scheme allows most overlays to be read from expanded memory

instead of from disk.

Note that this is the only method by which PWB will take advantage of

available expanded memory, and that PWB versions 1.00 and 1.10 have no

internal provisions to make use of extended memory in any way.