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Custom Chips
Custom Chips: Agnus
A DIP version of the 8361 Agnus
PLCC version of the 8370 Agnus
PLCC version of the 8371 Agnus
Agnus8361R3 - 1201K
Image of Agnus 8372A 318069-02 - 40K
Image of Agnus 8372A 318069-029 - 36K
Image of Agnus 8372B 318069-03 - 43K
Image of Agnus 8372AB 318069-039 - 33K
Image of Agnus 8375 318069-11 - 42K
Image of Agnus 8375 318069-17 - 46K
The Agnus is responsible for controlling around 25 system DMA channels, the generation of various system clocks in some Amiga's and for addressing Chip RAM. Infact, Chip Memory is so called because it's addressable by the system's custom chips, unlike Fast Memory. The Agnus also cotains an integrated Copper (co-processor) which controls aspects of the Amiga's display such as draggable screens, and the infamous "copper scrolls". The Amiga's blitter is also located in the Agnus chip and is responsible for moving rectangular areas of memory efficiently as possible. This may not sound particularly spectacular but the blitter is twice as fast as the 68000 at moving blocks of memory and is capable of doing it asynchronously with the 68000, meaning the processor is totally free for other operations. The blitter is particularly useful for graphics operations. Agnus is found in the OCS & ECS chipsets, and is the equivalent of Alice in the AGA chipset.
Chip Name | Chip Number | Part Number | Used In |
---|---|---|---|
Agnus (512K) | 8361 | 252125-01 | A1000 (NTSC), A2000A (NTSC) |
Agnus (512K) | 8361 R3 | A1000(NTSC), A2000A(NTSC) | |
Agnus (512K) | 8367 | 252362-01 | A1000 (PAL), A2000A (PAL) |
Agnus (512K) | 8370 | 318070-01 | A500 (NTSC), A2000 (NTSC) |
Agnus (512K) | 8371 | 318071-01 | A500 (PAL), A2000 (PAL) |
Agnus (1MB) | 8372 | 318069-02 | A500 (PAL), A2000 (PAL) Regular Type |
Agnus (1MB) | 8372A | 318069-029 | A500 (PAL), A2000 (PAL) (changed after some damage) |
Agnus (2MB) | 8372AB | 318069-03 | A3000 (PAL), A3000T (PAL) |
Agnus (2MB) | 8372B | 318069-03 | MegAChip (NTSC) |
Agnus (2MB) | 8375 R0 | 318069-18 | A500+ (PAL), A600 (PAL) |
Agnus (1MB) | 8375 / 8375 R1 | 318069-16 | A500 (PAL), A2000 (PAL) |
Agnus (2MB) | 8375 R2 | 318069-10 | A500+ (PAL), A600 (PAL) |
Agnus (2MB) | 8375 | 318069-11 | A500+(NTSC) and A600(NTSC) |
Agnus (1MB) | 8375 | 318069-17 | A500 (NTSC), A2000 (NTSC) |
Agnus (2MB) | 8375 | 318069-19 | A3000 (NTSC), A3000T (NTSC) |
Agnus (2MB) | 8375 | 390544-01 | A500+ (PAL), A600 (PAL) |
Agnus (2MB) | 8375 | 390544-02 | A500+ (NTSC), A600 (NTSC) |
Contributions to this page by:
Alexander Holland, Joe Torre, Mathieu Burgerhout, RiWa & Friends, Takahasi Kasiko
Letzte Änderung des Artikels: 2009-01-25 14:39
Revision: 1.0
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