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hardware:custom_chipset [2010/03/07 15:23]
gilgamesh blitter further description 		hardware:custom_chipset [2010/03/09 10:01] (current)
gilgamesh
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 ====== Custom Chipset ====== ====== Custom Chipset ======
-The chipset is responsible for the Amiga's ground breaking multimedia capabilities. It consists of several chips that take load off the main CPU perform various tasks. There are three generations of chipsets are found in classic Amigas: OCS, ECS and AGA.+The chipset is responsible for the Amiga's ground breaking multimedia capabilities. It consists of several chips that take load off the main CPU by performing various tasks. There are three generations of chipsets are found in classic Amigas: OCS, ECS and AGA.
  
 ===== OCS ===== ===== OCS =====
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 === Blitter === === Blitter ===
-The Blitter is co-processor logic that copies memory areas from one place to another in the chipmem asynchronosly by DMA. Blitter draws (patterned) lines and fills their interior or exterior, too. Blitter operations are called //blits//. +The Blitter is co-processor logic that copies memory areas from one place to another in the chipmem asynchronosly by DMA. Blitter draws (patterned) lines and fills their interior or exterior, too. Blitter operations are called [[hardware/blitter programming model|blits]]. 
  
 The Blitter operates on data words. It can perform bytewise and bitwise shifts. Up to three source blocks can be processed in a boolean logic function and the result is written to the destination block.  The Blitter operates on data words. It can perform bytewise and bitwise shifts. Up to three source blocks can be processed in a boolean logic function and the result is written to the destination block. 
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 ==== Denise ==== ==== Denise ====
-(aka. Daphne) The Denise chip extracts the actual pixel data from bitplanes in memory. It also controls the video timings and resolution and sets the graphics modes like EHB, HAM or Dual Playfield. Denise contains the logic for hardware acceleration for displaying sprites and collision detection.+(aka. Daphne) The [[hardware/denise_programming_model|Denise chip]] extracts the actual pixel data from bitplanes in memory. It also controls the video timings and resolution and sets the graphics modes like EHB, HAM or Dual Playfield. Denise contains the logic for hardware acceleration for displaying sprites and collision detection.
  
 === Playfields === === Playfields ===
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 The bitfields and palette information combined produce the so called playfield, a rectangular area of pixels. Playfields can actually be larger than the nominal display size (PAL, NTSC; LoRes, HiRes) to allow smooth scrolling of backgrounds. The bitfields and palette information combined produce the so called playfield, a rectangular area of pixels. Playfields can actually be larger than the nominal display size (PAL, NTSC; LoRes, HiRes) to allow smooth scrolling of backgrounds.
 +
 +The display size is
 +^  Resolution  ^  Columns  ^ ^  Norm  ^  Interlaced  ^  Lines  ^ 
 +|  LoRes  |  320  | :::|  PAL  |  no  |  256  | 
 +|  :::  |  :::  | :::|  :::  |  yes  |  512  | 
 +|  HiRes  |  640  | :::|  NTSC  |  no  |  200  | 
 +|  :::  |  :::  |::: |  :::  |  yes  |  400  | 
  
 ==== Paula ==== ==== Paula ====
hardware/custom_chipset.1267971792.txt.gz ยท Last modified: 2010/03/07 15:23 by gilgamesh
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