Akiko (Amiga)

In addition to the Amiga chipsets, various specially designed chips have been used in Commodore Amiga computers that do not belong to the 'Amiga chipset' in a tight sense.

Gary, short for Gate Array, has been used in the Amiga 500, 2000(B) and CDTV. Gary provides glue logic for bus control and houses supporting functions for the floppy disk drive. It integrates many functions built discretely in the earlier Amiga 1000 in order to reduce costs.

Fat Gary was Gary's upgrade for the 32-bit A3000/T and A4000/T.

Gayle replaced Gary in the A600 and A1200. It also incorporates the control logic for the PCMCIA and internal ATA interface on these systems.

Akiko is the CD32's all-purpose 'glue' chip and forms part of the AGA chipset used in that system. Akiko is responsible for implementing system glue logic that in previous Amiga models were found in the discrete chips Budgie, Gayle and the two CIAs. In detail, it includes control logic for the CD32's CD-ROM controller, system timers, the two game ports and the serial ('AUX') port and the chip memory soldered onto the motherboard. It controls a one kilobyte EEPROM for saving data such as highscores etc.

Additionally, the Akiko chip is able to perform simple 'chunky' to 'planar' graphics conversion in hardware. The Amiga's native display is a planar display which is simple and efficient to manipulate for routines like scrolling. However, chunky displays are faster and more efficient for 3D graphics manipulation. Akiko allows this conversion to be performed in hardware instead of relying on software conversion which would cause more overhead. The conversion works by writing 32 8-bit chunky pixels to Akiko's registers and reading back eight 32-bit words of converted planar data which can then be copied to the display buffer.

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