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-
-
- STAC ELECTRONICS
- TECHNICAL SUPPORT BULLETIN
-
- NUMBER: 006
- SUBJECT: LOADHI
-
- DATE: July 9, 1991
- TIME: 12:47 PM
-
- SOURCE: Tech Support, Engineering, User's Manual
- SUPERCEDES/
- SUPERCEDED BY:
- RELEASE STATUS: Public
-
- TITLE:
- Loading STACKER into high memory.
-
- OVERVIEW:
- To conserve base memory, it is possible to load the STACKER driver into
- high memory (between 640K and 1024K) on systems with 80286 chips and
- higher. Appropriate memory management software (QRAM, MOVE'EM, QEMM386,
- 386MAX) and hardware are needed. Loading high on an 80286 machine
- requires hardware support for Expanded Memory Specification (EMS) 4.0
- (see User's Manual, "Loading STACKER into High Memory").
-
- Note: For loading high using MS-DOS 5.0's DEVICEHIGH, see TECH015.DOC,
- "Loading STACKER into upper memory with MS-DOS 5.0".
-
- ISSUES/COMMENTS:
- Potential problems with loading high are:
- -crowding in high memory, resulting in disk-read errors;
- -erratic behavior of memory-intensive programs;
- -exclude-phrases omitted from the memory manager device line (STACKER
- coprocessor version only);
- -load-high driver not invoked in STACKER.COM device driver line;
- -STACKER cache (/M=xx) specified at excessive size;
- -insufficiently large block of contiguous memory between 640K and 1024K.
-
- RECOMMENDED ACTIONS:
- 1) Consult documentation for memory manager to verify syntax in
- CONFIG.SYS. (User's Manual, page 33, shows examples of modification to
- STACKER line only.)
-
- 2) If applicable, edit load-high driver line to exclude range used by
- coprocessor card (see User's Manual, "Re-enabling Memory Managers").
- Note that the correct syntax for the AT&T 6300's AEMM.SYS is /X=addr-
- addr.
-
- 3) Verify syntax of load-high statement in STACKER.COM device driver line
- (see User's Manual, "Loading STACKER into High Memory").
-
- 4) Reduce size of STACKER disk cache (/M=xx switch in STACKER.COM device
- driver line).
-
- 5) To verify load-high status, use a memory-mapping utility such as
- Quarterdeck's MANIFEST. If Interrupts 25 and 26 are at a segment value
- above A000, then STACKER is loaded high.