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for "hires" characters and 2 bits for "multicolor" characters)
* maximum video resolution depends on the television system (176 × 184 is the standard for the VIC-20 firmware, although up to 248 × 232p/464i is possible on the NTSC machine and up to 256 × 280 is possible on the PAL machine)
* 4 channel sound system (3 square wave + "white" noise + global volume setting)
* on-chip DMA

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