MD2203 ETC, MD2203 Datasheet - Page 10

• Manufacturer Part Number: MD2203
• Description: Disk Onchip 2000 DIP
• Manufacturer: ETC

After reset, the BIOS executes the POST (Power On Self-Test), and then searches for all expansion
ROM devices. When DiskOnChip 2000 is found, the BIOS executes the Initial Program Loader
(IPL) code located in the boot-block area of DiskOnChip 2000. This code loads the TrueFFS driver
into system memory, installs DiskOnChip 2000 as a disk in the system, and then returns control back
to the BIOS code. The operating system subsequently attempts to identify disks that are available and
the DiskOnChip 2000 software (TrueFFS) responds by emulating a hard disk.
From this point onward, DiskOnChip 2000 is identified by the system as a standard disk drive. It is
assigned a drive letter and it can be used by any software application. No BIOS setup modifications,
autoexec.bat/config.sys modifications or external software are required.
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91-SR-002-42-8L Rev. 3.4
DiskOnChip 2000 can be used as the only disk in the system, in which case it will be accessed as
drive [C:].
DiskOnChip 2000 can operate with or without a floppy drive, or with additional hard disks. When
working with a hard disk, DiskOnChip 2000 can be configured as the last drive (the default
configuration). In this case, the hard disk will be drive [C:] and DiskOnChip 2000 will be drive
[D:].
DiskOnChip 2000 can also be configured as the first drive. In this case, the hard disk will be drive
[D:] and DiskOnChip 2000 will be drive [C:].
DiskOnChip 2000 can be used as the boot device when configured as drive [C:]. In this
configuration, you must format DiskOnChip 2000 as a bootable device by copying the OS files
onto the disk. When running DOS, use the SYS command for this purpose.
0FFFFFh
0C8000h
0A0000h
0F0000h
Figure 3: PC Memory Map
DiskOnChip
Extended
Memory
Display
BIOS
RAM
1MB
640KB
0
8KB
DiskOnChip 2000 DIP
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