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hardware:custom_chipset [2010/03/07 15:23] gilgamesh blitter further description |
hardware:custom_chipset [2010/03/09 09:30] gilgamesh screen widths |
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====== Custom Chipset ====== | ====== Custom Chipset ====== | ||
- | The chipset is responsible for the Amiga' | + | The chipset is responsible for the Amiga' |
===== 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 |
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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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 | ||
+ | | LoRes | 320 | :::| PAL | no | 256 | | ||
+ | | ::: | ::: | :::| ::: | yes | 512 | | ||
+ | | HiRes | 640 | :::| NTSC | no | 200 | | ||
+ | | ::: | ::: |::: | ::: | yes | 400 | | ||
==== Paula ==== | ==== Paula ==== |