IBM L40 SX Quick Reference page 147

PS/2 Model L40 SX Quick Reference
Note on Default Memory Allocation:
#E.1.2.3 Note on Default Memory Allocation:
#Only one application can use the HMA at a time. If you omit the /HMAMIN=m
#parameter (or specify 0 for m), HIMEM.SYS reserves the HMA for the first
#application that requests it. HIMEM.SYS reserves the HMA for the first
#application that meets the memory requirements set by the /HMAMIN=m
#parameter. To ensure the most efficient use of the HMA, you should set m
#to the amount of memory required by the application that uses most of the
#HMA memory.
¦ Copyright IBM Corp. 1991
E.1.2.3 - 1