On 11 Apr 2012, at 22:42, Stefan Drissen wrote: > Jumping in a bit late here, but the results are absolutely stunning! > > I had an attempt at reading the source on github, but my Z80 has gone a bit > rusty. :-) > > Is the palette being adjusted multiple times while the line is being drawn > (similar to the rainbow processor effects on the Spectrum) or is the palette > being adjusted in the time between two lines? Please forgive me for talking > potential nonsense - I have completely lost any notion of how many t-states > are available between line end and next line start but the expensiveness of > outs does ring a bell somewhere. > > On another note (to hijack the thread), RJ does have some interesting ideas > between all his communication issues and his one meg 128k emulator > 'pestering' got me thinking - if this is uncontended RAM - how much could I > win in the SAM MOD player if I moved code and data to make use of the one > meg. Obviously larger mods would be interesting, but I'm more interested in > would I be able to increase the sample rate from 10.4 KHz to 15.6 KHz? Or is > the gain from uncontended vs contended RAM much too small? > > Regards, > > Stefan > > On Sat, Mar 24, 2012 at 3:10 AM, Simon Owen <simon.o...@simcoupe.org> wrote: > Hi all, > > I've been experimenting with HAM-style tricks on SAM, to try to improve > the quality of converted images. I've aimed to modify as many colours > as possible between lines, rather than using the traditional compromise > static palette. Are there any viewers using that technique already? > > I've written a Python script to convert regular images to a new .sham > format, and a SAM viewer program to display them. > > Demo: http://simonowen.com/sam/shamview/shamview.dsk > Source code: https://github.com/simonowen/shamview > > You might recognise some of them as SAM or image processing favourites! > > It still needs work on the dynamic palette selection, which just uses > the most-frequent colours, rather than doing proper quantisation. I > left the crayons image as an example of this breaking down. > > Si > You should get an increase of 10-20% with the 1Meg. I think in theory you could get as much as 30% if you didn't access internal mem at all. I have done a lot testing with the 1Meg and did a version of fido using it got about 10% extra speed I think.
David
