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PDT 3400 Product Reference Guide
STACKS = n, s n=0 and 8 ≤ n ≤ 64, s=0 and 32 ≤ s ≤ 512
This command controls the number and size of the DOS stacks used to service hardware
interrupts. Unless there is a specific requirement otherwise, we recommend using a value of
n=0 and s=0 to save memory.
Symbol-Provided Drivers
RDISK21T.SYS
This RAM disk driver provides the ability to create a simulated disk drive in RAM memory.
This driver is similar to the DOS RAMDRIVE.SYS driver; however, this driver adds the
ability to protect the RAM disk contents against accidental erasure or damage. Additionally,
RDISK21T allows RAM disk contents to be preserved across a Warm Boot.
This driver only supports creation of RAM disks using expanded(EMS) memory, not
transient program area (TPA) or extended (XMS) memory. RDISK21T.SYS can be used to
create more than one RAM disk (by loading it multiple times). Protection implies both write
protection and preservation across a Warm Boot. The /NOPROTECT switch can be used to
allow unprotected RAM disks to be created using RDISK21T.SYS. To create a protected
RAM Disk, add the following line to CONFIG.SYS:
DEVICE=RDISK21T.SYS XXXX
where XXXX is the number of KB (in decimal) you want your RAM Disk to be. If this
parameter is omitted, all available EMS memory is used for the RAM Disk. For an
unprotected RAM Disk, the command line would be:
DEVICE=RDISK21T.SYS XXXX /NOPROTECT
Note: Place this line after EMSALLOC.SYS and after VG230EMS.SYS.
When using RDISK21T.SYS without the /NOPROTECT switch (creating a protected RAM
disk), use VG230EMS.SYS with the /T:OFF switch. If you don't, the RAM disk contents are
destroyed when the EMS driver loads. Refer to the sections on EMSALLOC.SYS and VG-
230EMS in this chapter.
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