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1. Summary of new features for AA
32 bit wide data bus supports input of 32-bit wide bitplane data and allows
doubling of memory bandwidth. Additional doubling of bandwidth can be
achieved by using FAST page mode Ram. The same bandwidth enhancements are
available for sprites. Also the maximum number of bitplanes useable in all
modes was increased to eight (8).
The color Palette has been expanded to 256 colors deep and 25 bits wide (8
RED,8 GREEN,8 BLUE,1 GENLOCK). This permits display of 256
simultaneous colors in all resolutions. A palette of 16,777,216 colors are
available in all resolutions.
28Mhz clock input allows for cleaner definition of HIRES and SHRES pixels
ALICE`S clock genarator is synchronized by means of LISA`s 14MHz and SCLK
outputs, Genlock XCLK and XCLKEN pins have been eliminated (external MUX is
A new register bit allows sprites to appear in the screen border regions
(BRDRSPRT - See BPLCON3).
A bitplane mask field of 8 bits allows an address offset into the color
Two 4-bit mask fields do the same for odd and even sprites.
In Dual Playfield modes,2 4-bitplane playfields are now possible in all
Two Extra high-order playfield scrollbits allow seamless scrolling of up to
64 bit wide bitplanes in all resolutions. Resolution of bitplane scroll,
display window,and horizontal sprite position has been improved to 35ns in
A new 8-bitplane HAM mode has been created, 6 for colors and 2 for control
bits. All HAM modes are available in all resolutions (not just LORES as
A RST_input pin has been added, which resets all the bits contained in
registers that were new for ECS or LISA:
BPLCON3, BPLCON4, CLXCON2, DIWHIGH, FMODE.
Sprite resolution can be set to LORES,HIRES,SHRES,independant of bitplane
Attached Sprites are now available in all resolutions.
Hardware Scan Doubling support has been added for bitplanes and sprites.
This is intended to allow 15KHz screens to be intelligently displayed on a
31KHz monitor and share the display with 31KHz screens.