The main console unit consists of a 14×8×2 inch rectangular plastic case that houses the motherboard, with a cartridge slot on the right side and connectors for the external power supply and RF jack at the rear. The controllers connect into plugs in a recessed area on the top of the unit.

All first-party cartridges and most third-party software titles feature a 12-second pause before presenting the game select screen. This delay results from an intentional loop in the console's BIOS to enable on-screen display of the ColecoVision brand. Companies like Parker Brothers, Activision, and Micro Fun bypassed this loop, which necessitated embedding portions of the BIOS outside the delay loop, further reducing storage available to actual game programming.

CPU: Zilog Z80A @ 3.58 MHz
Video processor: Texas Instruments TMS9928A
256×192 resolution
32 sprites
16 colors
Sound: Texas Instruments SN76489A
3 tone generators
1 noise generator
VRAM: 16 KB
RAM: 1 KB
Storage: Cartridge: 8/16/24/32 KB

The ColecoVision contains the same CPU and graphics chip as the MSX and Sega SG-1000/SC-3000 but the MSX contains a different sound chip, the AY-3-8910. ColecoVision shares the same CPU and a sound chip with Sega Master System, also a similar but inferior graphics chip. For this reason it is not hard to port games between these systems.

Source: Wikipedia, "Coleco Vision", available under the CC-BY-SA License.