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Accessing new Antic modes through BASIC?

Added by 917k about 4 years ago

Could somebody give me a quick rundown of how to access the new 2x and 4x Antic color clock modes from BASIC?

Thanks


Replies (11)

RE: Accessing new Antic modes through BASIC? - Added by foft about 4 years ago

I can, but it doesn't work properly yet!

The register is 559, the shadow for DMACTL.

Normally its poke 559,0 to turn the screen off and poke 559,34 to turn it on. Which is the sum of 2 (normal width) and 32 (playfield dma on).

I also use the value 64, which is normally unused.

Giving: 32=dma on, 64=dma on x2 colour clock, 96=dma on x4 colour clock. Need to add 2 to these, so 34,66 and 98.

I just checked this to remind myself and it clearly 'kind of' works, but needs more to make it display properly...

RE: Accessing new Antic modes through BASIC? - Added by Stephen about 4 years ago

Super interested in this feature - more than any other like turbo CPU etc. Hope it's pretty easy to get working.

RE: Accessing new Antic modes through BASIC? - Added by 917k about 4 years ago

Yes, I would say this should have a pretty high priority as I feel this is something that really sets the Eclaire apart from other projects and could be extremely useful.

RE: Accessing new Antic modes through BASIC? - Added by foft about 4 years ago

Actually I agree it would be cool.

So, if I fix the hardware, any hands up for an E: driver? So we can run existing software in 80 col mode with 4.5 colours?

RE: Accessing new Antic modes through BASIC? - Added by foft about 4 years ago

This is why I didn't prioritise it, no-one seemed keen to use it... Anyway its on the list and I'll get around to it after the big cpu/firmware rework.

RE: Accessing new Antic modes through BASIC? - Added by xxl about 4 years ago

Maybe nobody wants to use it as E: driver :)

RE: Accessing new Antic modes through BASIC? - Added by foft almost 4 years ago

Not finished yet,but it is working pretty well again with the test core highres5.sof. See the news post for details and please try it out!

RE: Accessing new Antic modes through BASIC? - Added by foft over 3 years ago

V17 is out.

Antic side is done, Gtia side needs work to fix offset and sprites!

Please try it out!!

RE: Accessing new Antic modes through BASIC? - Added by 917k over 3 years ago

I think an 80-column E: driver would really be the icing on the cake to show this off. If I had the skills, I would volunteer to do this in a minute.

RE: Accessing new Antic modes through BASIC? - Added by foft over 3 years ago

Yeah, I'm still hoping that someone will offer to help with this.

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