nbuilt-in video support for the following monitors:
Macintosh 12" Monochrome Display
Macintosh 12" RGB Display
AppleColor High-Resolution RGB Monitor (13")
Macintosh Color Display (13")
Apple Macintosh Portrait Display (15")
Macintosh 16" Color Display
VGA monitors
nslots for two NuBus cards (for Ethernet, Token Ring,
additional video, or other capabilities)
nan FPU socket for an optional math coprocessor
na 512K VRAM SIMM expansion slot (for 16-bit color on Apple
13" and 16" monitors, and 8-bit grayscale on the Apple 15"
portrait monitor)
nan automatic insert/eject feature to ensure reliable docking
na key-operated lock to prevent theft of the docked
PowerBook Duo
Floppy 
disk drive
Ç Security slot
Internal
Modem - Sound out
g SCSI
[ Printer
V ADB port
I
NuBus slots
External
Modem
Video
Q
W
Power
button
Sound in
Chapter 13: Building a PowerBook Duo System 217