is this an 8 bit source file?

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is this an 8 bit source file?

Postby charles » Mon Feb 20, 2012 8:14 pm

its been suggested that this file "basssynth"
is for the 8-bit platform and i code for the st ,so i am looking to have someone
who uses the older 8 bit machines verify its native format

anybody have this file or able to load and save a asc translation for me?

interested in finding unique algos within old src .

thanks
charles
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Re: is this an 8 bit source file?

Postby Fox-1 » Mon Feb 20, 2012 8:55 pm

The source in ASCII format (not ATASCII)

BASYNTH.ASC


I'm in doubt it's useful for anything other then running on Atari 8-Bit though as it's more or less directly programmed on the POKEY hardware.


edit: Yes, it was a tokenized Atari 8-bit source
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Re: is this an 8 bit source file?

Postby charles » Mon Feb 20, 2012 9:29 pm

thanks for translation, this will help , a little ,,man i remmeber the 400 and 800 emulator derek mihoka had for the st ,, boy i sure am glad we don't use those anymore , a real st is way cool!!!

most of this is straight forward , i will just use the notes in one of my own programs in an abstract way ,,anything i should know about this code ?

whats at mem location 765 ?

thanks

charles
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Re: is this an 8 bit source file?

Postby Fox-1 » Mon Feb 20, 2012 10:05 pm

charles wrote:a real st is way cool!!!


A real 8-bit is way cooler :-)


charles wrote:anything i should know about this code ?

whats at mem location 765 ?


I suppose you mean "764". It holds the value of the last pressed key (hardware register value, not ASCII). A value of "255" means no key pressed.

Locations "560" / "561" is the Display List, in this case used to mix the 2 graphic modes (big characters / small characters) as seen in the start-up screen.

Location "559" is DMA register. Setting to "0" turns off ANTIC (no visible screen) to speed up some calculations. "34" Enables normal screen width, "33" for narrow screen, "35" for wide screen.

Locations "709", "710", "711", "712" are colors/luminance of characters, editor screen and screen border

Location "53279" is the GTIA. Reading it returns the status of the console keys (Start/Select/Option). "7" means no key is hold down, "6" means Start is hold down.

Locations "53760" -> "53765" is POKEY hardware
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