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notes:atari:book_dereatari:system_overview

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notes:atari:book_dereatari:system_overview [2016/09/08]
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notes:atari:book_dereatari:system_overview [2020/08/26] (current)
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-====== De Re Atari ======+[[notes:atari:book_dereatari|De Re Atari - CONTENTS]]
  
 ====== SYSTEM OVERVIEW ====== ====== SYSTEM OVERVIEW ======
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 CTIA is a television interface chip. ANTIC directly controls most of CTIA's operations, but the 6502 can be programmed to intercede and control some or all of CTIA's functions. CTIA converts the digital commands from ANTIC (or the 6502) into the signal that goes to the television. CTIA also adds some factors of its own, such as color values, player-missile graphics, and collision detection. CTIA is a television interface chip. ANTIC directly controls most of CTIA's operations, but the 6502 can be programmed to intercede and control some or all of CTIA's functions. CTIA converts the digital commands from ANTIC (or the 6502) into the signal that goes to the television. CTIA also adds some factors of its own, such as color values, player-missile graphics, and collision detection.
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 +POKEY is a digital input/output (I/O) chip. It handles such disparate tasks as the serial I/O bus, audio generation, keyboard scan, and random number generation. It also digitizes the resistive paddle inputs and controls maskable interrupt (IRQ) requests from peripherals.
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 +All four of these LSI chips function simultaneously. Careful separation of their functions in the design phase has minimized conflicts between the chips. The only hardware level conflict between any two chips in the system occurs when ANTIC needs to use the address and data buses to fetch its display information. To do this, it halts the 6502 and takes control of the buses.
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 +As with all 6502 systems, the I/O is memory-mapped. Figure 1-1 presents the coarse memory map for the computer. Figure 1-2 shows the hardware arrangement.
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 +{{ Atari_Book_Fig1-1.PNG?400 }}
 +Figure 1-1 The coarse memory map
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 +{{Atari_Book_Fig1-2.PNG}}
 +Figure 1-2 The hardware arrangement
  
  
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