CompuServe Messages

The larger number of colors comes, essentially, from trading spacial resolution that the Amiga already had, for color resolution that it didn't. The same number of bits are used for a HAM-E REG or HAME mode image that are used in a 640 by 4 bitplane image of the same vertical and overscan sizes. In REG mode, 4 bits at 640 becomes 8 bits at 320, which look up 256 24 bit color registers. In HAME mode, 4 bits at 640 become 8 bits at 320, which are then expanded into a delta modulation scheme similar to, but far better than, the Amiga's native HAM mode. Look at this: Amiga HAM HAME/HAM ——— ——– Max H resolution 384 384 Max V resolution 560 560 Max HAM colors 4096 262144 Max REG colors 16 480 REG color range 4096 16777216 # of genlock clrs 1 (0) 2 (0,1) On the negative side, HAM-E HAM mode takes more of the chip bus bandwidth, the same as hi-res images do. Screen refresh can be done by the blitter; and the entire screen can updated by either blitter moves or copper page swapping, both are extremely fast and both permit animation. Ben Amateur Radio Callsign is A A 7 A S