Quote:
Originally Posted by Toni Wilen
256*25 (Genlock bit is settable and readable if RDRAM=1)
Other things I can think of that are much bigger in Lisa:
- 2 more bitplanes.
- Bitplane registers (I think it is 3 per plane) are 64-bit (was 16-bit)
- Sprite registers (4 per sprite) are 64-bit (was 16-bit)
- Palette registers probably are some kind of complex dual-ported design because they can be written to (or even read) by the CPU without visible glitches.
- "real" shres support, all horizontal comparators use shres timing internally. Denise was mostly lores based except bitplanes supported hires. But this shouldn't increase complexity much.
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Thx Toni, i should check spec before asking.
Can't find now source but somebody listed that Lisa 391227-01 has over 225 thousand transistors - this mean it is most complex IC - it has more transistors than Agnus (Alice), + Paula + Denise + MC68000 - this is very odd to be honest unless HP process required something special then it is very difficult to justify such complexity.