GBC Specs

CPU / Color
8 MHz Z80 work alike by Sharp with 2 processor modes:
Single (4MHz) and double (8MHz).
About 12MHz total, really.

There are 10, 32, or 56 on screen colors from a palette of 32,000.
Although some new games use a method of "layering" which allows for more than
256 colors displayed at a time from that palette. Although these types of
games usually have a bit of "clipping" due to the display resolution of the
Game Boy Color.

Sound
4 Channel FM stereo- same as Game Boy Pocket

Controls
8 directional D-Pad, A,B, select, and Start buttons.

Power
13 hours on average from 2 AA Akaline batteries, or power from AC adapter.
About 20 average for 2 AA Lithium Batteries.
Nickel Cadium Batteries are not reccommended.

Resolution
160x144x56 colors
Other higher-color modes are available using special color techniques.

Sprites
40 - 8x16, 8x8
(4 color sprites - 4 colors - 1 being a transparent)
This is the amount displayable per pixel line by the Game Boy Color; although
many "tricks" have been created for forcing larger and larger sprites in to
the screen playing field with out clipping.

Tiles
512 on screen making use of the 16K of VRAM
These are those little "pixels". In layering, the pixel tiles are "squished"
together at various points to make the system display more colors than its
specs should allow.

Cart Size
256KBit - 16MBit for GB compatible games.
Up to 64MBit ROM & 128KBytes RAM.
One Megabit of Ram is 1/8th of 1 Megabyte. IE = 8 Megabits is 1 Megabyte.

DMA
There are 2 new DMA transfer modes.
The transfer is constant regardless of CPU speed.
These new modes allow transferring anything from ROM or RAM to VRAM at a rate
of 16 bytes per H-Blank.
This transfer rate is necessary because of the color display requirements,
and provides for faster, smoother animation.

Serial port speed
512 Kbps (Kilobits per Second.)