Technical data

Utility Software for MS-DOS
86 VIPA GmbH CP486 ⋅ 00/14
Memory Card Silicon Disk with 1MB ROM:
DEVICE = \DEVICE\sdrom.sys base address=/80 size=/1024
Explanation: The driver is in the subdirectory "DEVICE" on the boot drive. The silicon disk
consists of a read-only memory. Therefore, the driver SDROM.SYS is taken. The
base address of the memory card slot is 800000H. The silicon disk has a capacity of
1024 KByte = 1MB.
Memory Card Silicon Disk with 128KB SRAM:
DEVICE = \DEVICE\sdram.sys base address=/80 size=/128
Explanation: The driver is in the subdirectory "DEVICE" on the boot drive. The silicon disk
consists of a write-only memory. Therefore, the driver SDRAM.SYS is taken. The
base address of the memory card slot is 800000H. The silicon disk has a capacity of
128 KByte.
Annotation:
If the silicon disk has already been activated in the VIPA-SETUP, an entry in the CONFIG.SYS file
is not necessary! In this case, the disk has already been assigned the drive identification A:. An
additional entry in the CONFIG.SYS file would assign a second disk drive identification.
Several silicon disks can be installed by repeating the statement in the file CONFIG.SYS with the
corresponding changes of the parameters. In this manner a physically coherent address area can be
seperated in several logical silicon disk drives.
The operating system installs all drivers in the file CONFIG.SYS. On this occasion a drive
specification is assigned to every storage media (e.g. D: oder E: and so on). This drive specification
will be displayed on the screen during start up as a message.
Every virtual drive will expand the resident part of DOS at about 600 bytes for the driver.
SRAM silicon disks have to be intitialized by the program FORMATSD. If the RAM disk is battery
or accumulator buffered, this has to take place just once, otherwise after every start of the system.
On buffered RAM disks data will be maintained even after switching off the system for a certain
period (see specification).
Buffered RAM disks are bootable, if an operating system is installed on the disk.