I have 128 MB of RAM. Under certain configurations, I run out of memory when my DOS-e

[R. T. (Fortran Man)]

I have 128 MB of RAM. Under certain configurations, I run out of memory when my DOS-extended application needs more than 64 MB. How can I get access to all 128 MB plus all available virtual memory?

[Lahey Support]

You need to use the /numhandles=128 switch by adding/modifying the HIMEM.SYS statement in your CONFIG.SYS file to increase the number of XMS handles.
For example:

DEVICE=C:\WINDOWS\HIMEM.SYS /NUMHANDLES=128

NOTE: Pharlap is not able to report more than 64mb of memory even though more is available and Pharlap is able to use it.