Technical information

CHAPTER 1
Introduction
2
Appearance and Features
The DOS Compatibility Card is a plug-in assembly designed to provide IBM-compatible
PC functionality on a Power Macintosh 6100 computer. The DOS Compatibility Card
includes an 80486 microprocessor and interface devices that allow it to use the I/O
capabilities of the host computer. When installed in a Macintosh computer, the DOS
Compatibility Card provides a cost-effective system with performance equivalent to a
stand-alone PC.
Appearance and Features 1
The DOS Compatibility Card assembly consists of a 7-inch processor card, a processor-
direct slot (PDS) adapter card, and a shield bracket. The assembly fits inside a Power
Macintosh 6100 computer and is plugged into the computer’s PDS slot. Figure 1-1 shows
the DOS Compatibility Card assembly. For installation instructions, please refer to the
DOS Compatibility Card User’s Manual.
Figure 1-1 The DOS Compatibility Card assembly
The following list is a summary of the hardware features of the DOS Compatibility Card.
Each of these features is described later in this developer note.
■
Processor. The DOS Compatibility Card has an 80486DX2 microprocessor operating
at a clock speed of 66 MHz.
■
Expansion RAM. The card accepts one standard 72-pin DRAM SIMM containing
either 2, 4, 8, 16, or 32 MB. Recommended DRAM speed is 80 ns or less.
■
Shared RAM. The card can use part of the DRAM in the Macintosh host computer.
The user can select a memory size of 2, 4, 8, 16, 32, or 64 MB, provided the Macintosh
computer has enough memory installed.
Shield bracket
Processor card
PDS adapter card
Sound card