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hardware [2016/06/05 15:06]
ex_writer 		hardware [2016/06/05 15:13]
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 The Bally Professional Arcade is a full-color videogame system based on the mass-RAM-buffer technique. A mass-RAM-buffer system is one in which one or more bits of RAM are used to define the color and intensity of a pixel on the screen. The picture on the screen is defined by the contents of RAM and can easily be changed by modifying RAM. The Bally Professional Arcade is a full-color videogame system based on the mass-RAM-buffer technique. A mass-RAM-buffer system is one in which one or more bits of RAM are used to define the color and intensity of a pixel on the screen. The picture on the screen is defined by the contents of RAM and can easily be changed by modifying RAM.
  
-The system uses a Z80 microprocessor as its main control unit. The [[:system ROM]] has software for four games: Gunfight, Checkmate, Scribbling, and Calculator. Additional ROM can be accessed through the cartridge connector. Three [[hardware:​custom chips]] control the video interface, special video processing functions, keyboard and control handle interface, and audio generation.+The system uses a Z80 microprocessor as its main control unit. The [[software:system ROM]] has software for four games: Gunfight, Checkmate, Scribbling, and Calculator. Additional ROM can be accessed through the cartridge connector. Three [[hardware:​custom chips]] control the video interface, special video processing functions, keyboard and control handle interface, and audio generation.
  
 The system exists in both high-resolution and low-resolution models. The three custom chips can operate in either mode. The mode of operation is determined by bit 0 of [[hardware:​i o ports|output port]] 8H. It must be set to 0 for low-resolution and 1 for high-resolution. This bit is not set to 0 at power up and must be set by software before any RAM operations can be performed. The system exists in both high-resolution and low-resolution models. The three custom chips can operate in either mode. The mode of operation is determined by bit 0 of [[hardware:​i o ports|output port]] 8H. It must be set to 0 for low-resolution and 1 for high-resolution. This bit is not set to 0 at power up and must be set by software before any RAM operations can be performed.