Like most 8bit machines of the period, the CoCo3 has a cartridge port, joystick port, and a built in RF modulator for hooking up to your television. The screen output using the RF modulator though leaves a bit to be desired, with quite a bit of artifacting present in text, such as in the 'Extended Color Basic' that the CoCo3 boots into. To do away with this, it is best to use the RGB port on the bottom of the machine to connect a monitor such as the Tandy CM-8. The CoCo-3 supported a maximum of 16 active colors out of a total of 64 with a maximum resolution of 640x225. It also supported all the CoCo-2 video modes, with the exception of the 'semigraphics' modes, and added the following additional modes: 40 and 80 column text with true lower case, 320x192x4, 320x192x16, 640x192x2, and 640x192x4. Additionally, 320x200, 640x200, and 640x225 were available using certain POKEs within programs.