Some VBXE stuff

[Mclaneinc]

Just enable the ULT1MB in Altirra and the VBXE, hit F6 and reset to bring up the ULT menu, make sure SDX is enabled and make sure VBXE is enable and set to the base address of d640 (?)Save it and quit, mount said disk and off ya go..

[Thelen]

1 hour ago, Beeblebrox said:

so this might help get you started

Thanks!!

[Mclaneinc]

Damn, should have made it clear that the Ult1MB isn't classed as a device, so isn't in the device menu, it's classed as a memory upgrade in the memory section. Sorry, it's easy to think of it as a device as it's more than just a memory upgrade. Should have made it clearer for people new to Altirra or using said features for the first time.

Edited December 5, 2022 by Mclaneinc

[+Stephen]

8 hours ago, Rybags said:

I've not had chance to give it a look yet.

How is it you're doing the 4 palettes?  Is it selection of a palette depending on close colour matches or do you just split the screen into 4 vertical regions with 1 per region?

I had an idea of doing 5 palettes - you could reload the first one using brute-force programing, ie LDA #nn / STA CR ... etc.

Though that's a cost of 18 cycles and 15 bytes per entry = 4608 cycles and 3,840 bytes (with Antic DMA off that would be around 44 scanlines)

So in theory you could probably do 3 or 4 palette reloads for even more extra colour.  The palette reload code could be generated by blits which could cut down on memory use a little.

 

Though all that said, I think a PC based optimizer that generated 4 palettes and selected one per attribute cell based on best match would probably be the best picture display method.

Correct on both accounts.  This 1st image was just a cheat - the screen is in 4 vertical bands.  However, I have planned (and am working on) an image colour reducer using the median cut algorithm.  Once I have that working, the next step is figuring out how to split the palettes into line by line regions.

[Rybags]

Another possibility is to use legacy video "underlay" to add colour though doing that would be a lot of effort for not much gain.

[flashjazzcat]

I've fixed up the SIDE3 FMS so that it doesn't get upset by those unterminated filenames. Everything works great now:

 

I'll release that update shortly.