Technical information

CHAPTER 1
Introduction
8
How the DOS Compatibility Card Works
Video Monitor 1
A DOS Compatibility Card installed in a Power Macintosh 6100 computer can either
have its own monitor or share the same monitor used for the Macintosh host computer.
When using separate monitors for the card and the Macintosh host computer, both
screens can be updating at the same time. (Only one at a time can be receiving user input
from the keyboard and mouse.) The monitors that can be shared are
■
Macintosh Color 14-inch
■ Macintosh Color 16-inch
■
Macintosh Multiple Scan 17-inch
■
Macintosh Multiple Scan 20-inch
■
VGA (640 by 480 pixels)
■
SVGA (800 by 600 pixels)
The DOS Compatibility Card uses a special monitor adapter cable to allow the card and
the Macintosh host computer to share a single monitor. This cable connects the DB15
video output connector on the Macintosh computer and the DB-26 output connector on
the DOS Compatibility Card. The shared video monitor is connected to the DB-15
connector closest to the host computer. Figure 1-4 shows the monitor adapter cable.
Figure 1-5 shows the back of a Power Macintosh 6100 computer with the monitor
adapter cable installed.
Figure 1-4 Monitor adapter cable
The DOS Compatibility Card detects the monitor type by means of the monitor sense
lines and stores the information for the host computer to interrogate at startup time.
For more information about the monitor sense lines, see the section “Video System” on
page 22.
To game controller
26-pin connector
to DOS Compatibility Card
To monitor cable
15-pin connector
to Macintosh monitor port