High Res Bally BASIC + Variable Rez BASIC

The Perkins Hi-Res Board is the standard Bally Motherboard with 39 ICs added to exploit the high resolution capability of the Bally custom chips (most ICs piggy-back onto existing chips). Many extra connections are made to make the item 'work'. When powered up, the picture normally seen filling the screen is reduced to one-fourth the size, and occupies the upper left quadrant of the screen. Resolution mode is software selectable at low-res (normal, 160x102) for existing programs, medium (160x204, similar to Mattel Intellivision), and high (320x204, better than Apple II). The 39 chips include an EPROM for firmware support of the new modes and 12K of additional memory. The software mode selection allows the individual program to choose its own resolution for full compatibility with existing game cartridges and Bally BASIC.

Game's Tape.