Technical Reference Manual
Page 32 of 38
PT-3000
3 CHAPTER 3 - DRIVER DETAILS
3.1 Disk-On-Chip (“DOC”) Interface
The Disk-On-Chip (DOC) -2000 is a single chip Flash Disk designed to plug into a
standard 32-pin flash EPROM socket. The DOC-2000 should be mapped into an 8K
byte window in the BIOS expansion address space of the system, which is located
between address C8000H to E0000H.
The Disk-On-Chip 2000 contain a built-in copy of the M-System industry-standard
TrueFFS software, which makes the DOC to operate as a standard disk drive. The
DOC-2000 can contain the operating system in it to allow BOOT in systems without a
hard disk.
The DOC is a self-contained device. The installation of the DOC does not require any
software installation. The design of the DOC allows for full upward and downward
compatibility. While available today in capacities of 2 to 72 Mbytes,. Future DOC
devices with higher densities, will be fully compatible with standard DOC sockets. The
basic design of the DOC actually supports an unlimited capacity.
Operating the Disk-On-Chip
3.1.1 Installing the Disk-On-Chip 2000:
When installing or removing the DOC, be sure to first touch a grounded surface to
discharge any static electricity from you body. Use the following procedure to
install the DOC:
• Align pin 1 on the DOC with pin 1 of socket.
• Push the DOC into the socket carefully until it is fully seated.
• Check to make sure the DOC is installed securely, and there are no bent pins.
• Caution: The DOC may be permanently damaged if installed incorrectly!
• To install the DOC as drive C on a system with out a hard disk, set the CMOS
setup of drive C to “not installed” (setting that no physical magnetic disk is
installed), and reboot the computer. The DOC-2000 will install as drive C. The
DOC needs to be formatted with the system files in order for it to BOOT. See
“Configuring the DOC as the BOOT device” .
• To install the DOC as drive D on a system with a hard disk, just reboot the
system, and DOC will install as drive D.
• To install the DOC as drive C on a system with a hard disk, see “Configuring
the DOC as the first derive” .
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