IBM L40 SX Quick Reference page 146

#E.1.2.2 Format:
#DEVICE=DRIVE:PATH HIMEM.SYS
# [/Hmamin=m]
# [/Numhandles=n]
# [/Int15=xxxx]
# [/Machine:xxxx]
# [/A20control: ON | OFF]
# [/Shadowram: ON | OFF]
# [/Cpuclock: ON | OFF]
#[/HMAMIN= m]: m is the amount of memory (in kilobytes) an application
#must use before HIMEM.SYS permits the program to use the HMA.
#range is 0 to 63. The default is 0.
#[/NUMHANDLES= n]: n is the maximum number of extended-memory-block (EMB)
#handles that can be used simultaneously.
#The default is 32. Each additional handle requires an additional 6 bytes
#of resident memory.
#[/INT15= xxxx]: Allocates the specified amount of extended memory (in
#kilobytes) for the Interrupt 15h interface.
#conflicting extended-memory scheme.
#parameter, applications must recognize VDisk headers.
#memory is available, add 64 to the value you want to specify for xxxx.
#The valid range is 64 to 65535.
#is assumed to be 0. The default is 0.
#[/MACHINE: xx]: Specifies an A20 handler to be used.
#part of your computer that gives it access to the HMA.
#Typically, HIMEM.SYS detects which A20 handler is being used.
#have to specify a value for this parameter if the A20 handler reports
#problems or if you have problems using DOS in the HMA.
#The value for xx can be any of the following.
+------------------------------------------------------------------------+
¦ Code Assigned to A20 handler
+------------------------------------+-----------------------------------¦
¦ at | 1
+------------------------------------+-----------------------------------¦
¦ ps2 | 2
+------------------------------------+-----------------------------------¦
¦ at1 | 11
+------------------------------------+-----------------------------------¦
¦ at2 | 12
+------------------------------------+-----------------------------------¦
¦ at3 | 13
+------------------------------------------------------------------------+
#The default is at or 1.
#[/A20CONTROL: ON | OFF]:
#of the A20 line even if A20 was ON when HIMEM.SYS was loaded.
#specify OFF, HIMEM.SYS takes control of the A20 line only if A20 was Off
#when HIMEM.SYS was loaded.
#[/SHADOWRAM: ON | OFF]:
#shadow-RAM (random access memory) used for ROM (read-only memory) and add
#that RAM to its memory pool.
#of RAM, the default is OFF.
#computers.
#[/CPUCLOCK: ON | OFF]:
#speed of your computer.
#HIMEM.SYS, specifying ON might correct the problem.
#down HIMEM.SYS. The default is ON.
PS/2 Model L40 SX Quick Reference
Format:
The valid range is 1 to 128.
Some older applications use a
To use memory allocated by this
If you specify a value less than 64, it
¦ For Machine
¦ IBM AT
¦ IBM PS/2
¦ IBM AT
¦ IBM AT (alternative delay)
¦ IBM AT (alternative delay)
Specifies whether HIMEM.SYS is to take control
The default is ON.
Specifies whether HIMEM.SYS is to switch off
If your computer has less than 2 megabytes
This parameter is supported only on some
Specifies whether HIMEM.SYS is to affect the clock
If the clock speed changes when you install
¦ Copyright IBM Corp. 1991
E.1.2.2 - 1
The valid
To ensure enough
An A20 handler is a
You might
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If you
Specifying ON slows