![]() ![]() This increased the maximum onscreen colours without using tricks to 256 colours, and added a new HAM mode, HAM8, which can technically show virtually all of the over 16 million colours available in the palette, but due to the restriction in how HAM8 mode operates, using a base palette of 64 colours and then modifying the Red, Green or Blue of the pixel to the right, realistically you can’t use all the available colours in a useful way. ![]() In AGA, this was doubled to 8 bits for each RGB element, giving a total of a 16.8 million colour palette (256*256*256=16,777,216 colours) while retaining near total compatibility with older software. ![]() HAM could show all possible colours, with restrictions, and EHB could display 64 colours, but both had heavy restrictions, and are covered in more detail on the pages for OCS and ECS. In the previous OCS and ECS chipsets, the colour palette was always formed using 4bits for each of the Red, Blue and Green elements, giving a total of 4096 colours (16*16*16=4096) to choose from, of which 32 could be shown onscreen at once without using the EHB or HAM6 video modes. It was originally going to be called the AA chipset, but it was changed to AGA, which apparently stood for “Advanced Graphics Architecture”, which sounds about right, because while the graphic output had quite a number of changes, the audio system was untouched. The final revision to the Amigas custom chips came to be known as the AGA chipset.
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