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Derrick Renaud
Discrete Coder
Reged: 10/18/03
Posts: 438
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Re: Why are MAME INPUT_ABSOLUTE_{MIN/MAX} 17 bits?
04/26/12 04:06 PM


> Bryan Ischo,
>
> Please point me at what file(s) are you looking at and what variables? What data type
> is used to store that value?
>
> I would expect the range to be -1.0f to 1.0f, although most of the games probably use
> −128 to 127, or something like that, but in any case, is that range you are
> talking about passed to all the game drivers or is it converted to something else
> first?

It is the range passed from the OS layer to MAME which then gets converted to the port value needed by the game driver. Which can be anything. 1bit, 2bits, 8bits, 16bits, etc

read the input .h files its described at the top of one of them.


Do not p-mail me for help compiling my updates, ask on the board.
Do not request sound for your favorite game. I work on whatever, when I get around to it.
If you have schematics for discrete sound games not easily found on the net, I would be interested.







Entire thread
Subject Posted by Posted on
* Why are MAME INPUT_ABSOLUTE_{MIN/MAX} 17 bits? Bryan Ischo 03/23/12 12:08 AM
. * Re: Why are MAME INPUT_ABSOLUTE_{MIN/MAX} 17 bits? LazyCat  04/26/12 01:41 PM
. * Re: Why are MAME INPUT_ABSOLUTE_{MIN/MAX} 17 bits? Derrick Renaud  04/26/12 04:06 PM
. * Re: Why are MAME INPUT_ABSOLUTE_{MIN/MAX} 17 bits? LazyCat  04/26/12 07:13 PM
. * Re: Why are MAME INPUT_ABSOLUTE_{MIN/MAX} 17 bits? Derrick Renaud  04/26/12 11:55 PM
. * Re: Why are MAME INPUT_ABSOLUTE_{MIN/MAX} 17 bits? LazyCat  04/27/12 06:02 AM
. * Re: Why are MAME INPUT_ABSOLUTE_{MIN/MAX} 17 bits? Derrick Renaud  04/27/12 04:34 PM
. * Re: Why are MAME INPUT_ABSOLUTE_{MIN/MAX} 17 bits? LazyCat  04/29/12 12:51 AM
. * Re: Why are MAME INPUT_ABSOLUTE_{MIN/MAX} 17 bits? LazyCat  04/28/12 06:18 PM
. * Re: Why are MAME INPUT_ABSOLUTE_{MIN/MAX} 17 bits? Bryan Ischo  05/08/12 06:24 AM
. * Re: Why are MAME INPUT_ABSOLUTE_{MIN/MAX} 17 bits? LazyCat  05/08/12 03:34 PM
. * Re: Why are MAME INPUT_ABSOLUTE_{MIN/MAX} 17 bits? B2K24  04/06/12 10:11 PM
. * Re: Why are MAME INPUT_ABSOLUTE_{MIN/MAX} 17 bits? mogli  04/01/12 04:55 AM
. * Re: Why are MAME INPUT_ABSOLUTE_{MIN/MAX} 17 bits? R. Belmont  04/06/12 04:29 PM
. * Re: Why are MAME INPUT_ABSOLUTE_{MIN/MAX} 17 bits? LazyCat  04/26/12 03:21 PM
. * Re: Why are MAME INPUT_ABSOLUTE_{MIN/MAX} 17 bits? krick  04/27/12 05:23 AM
. * Re: Why are MAME INPUT_ABSOLUTE_{MIN/MAX} 17 bits? Derrick Renaud  04/24/12 08:06 PM
. * Re: Why are MAME INPUT_ABSOLUTE_{MIN/MAX} 17 bits? Ramirez  04/24/12 11:22 PM
. * Re: Why are MAME INPUT_ABSOLUTE_{MIN/MAX} 17 bits? Sune  04/08/12 07:07 PM
. * Re: Why are MAME INPUT_ABSOLUTE_{MIN/MAX} 17 bits? R. Belmont  04/09/12 04:38 PM
. * Re: Why are MAME INPUT_ABSOLUTE_{MIN/MAX} 17 bits? Sune  05/08/12 11:11 PM
. * Re: Why are MAME INPUT_ABSOLUTE_{MIN/MAX} 17 bits? R. Belmont  05/10/12 12:21 AM
. * Re: Why are MAME INPUT_ABSOLUTE_{MIN/MAX} 17 bits? mesk  04/06/12 09:58 PM

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