Digital Watchdog x39 Manuel de service télécharger pdf (Page 93)

Utility Software for MS-DOS

CP 486 ⋅ 00/14 VIPA GmbH 91

5.1.5 Examples for Applying the Silicon Disk

5.1.5.1 Example for Generating a SRAM-Disk:

Goal: On the base address C0 0000hex, an SRAM silicon disk with a capacity of 256KB

(consisting of two 128KByte SRAMs (1MBit SRAMs)) should be generated.

The base board is to be assembled with 2 SRAMs each of 128KByte-chips and the jumpers set up

adequate (see HW-description of the base board).

The system is booted from hard disk (drive C:). The programs SDRAM.SYS, FORMATSD.EXE

(in the subdirectory C:\SD) and a text editor are required for the generation.

The following lines are input at the end into the file C:\CONFIG.SYS via the text editor:

DEVICE = C:\SD\SDRAM.SYS base=/C0 size=/256

The system is re-started by pressing at the same time the keys <CTRL>, <ALT> and <DEL>.

At the runup, the system outputs i.a. the following messages:

SILICON DISK installed as drive D: . Vx.x date

RAMDISK STARTED WITH ADDRESS C0 0000H

Thus, the drive is present and has to be formatted by means of the following call:

C:\SD\FORMATSD D: /D:32 /S

The program FORMATSD.EXE sets up now a DOS-structure at the drive D: (SRAM-disk). In

doing so, space for 32 main directory entries is reserved. If the program has formatted the data

memory without error messages, this can be responded as MS-DOS drive. The system files are

transferred to the SRAM-disk by means of the parameter /S. Thus the SRAM-disk can be used as

boot drive.

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Digital Watchdog x39 Manuel de service Page 93