In addition to the
/A20CONTROL command line switch, I haven??™t discussed the /CPUCLOCK, /EISA, /MACHINE,
and /SHADOWRAM command line switches. This section contains descriptions of the command
line switches that are still useful.
/HMAMIN=m Specifies how many kilobytes of HMA memory an application must request in
order for HIMEM.SYS to fulfill the request. Some applications ask for small pieces of the HMA
area, which fragments an already small memory area and makes it unavailable for other applications.
It becomes a question of efficient memory use. An application that can use a larger piece
of the HMA will likely free more conventional memory for use by other applications. You can
specify any value between 0 and 63. The default value is 0. Setting this command line switch to
0 or omitting it from the command line lets HIMEM.SYS allocate the HMA memory to the first
application that requests it, regardless of how much HMA memory that application will use.
/INT15=xxxx Specifies the amount of extended memory in kilobytes that HIMEM.SYS should
reserve for the Interrupt 15h interface. You may wonder what the Interrupt 15h interface is all
about; it??™s the method that applications use to interact with XMS.
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