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GUS Programmer's Digest Fri Jun 18 00:07 Volume 2: Issue 16
Today's Topics:
GUS Programmer's Digest V2 #15
pro developers kit
Twos complement bit and DRAM download
Weekly IRC
Standard Info:
- Meta-info about the GUS can be found at the end of the Digest.
- Before you ask a question, please READ THE FAQ.
----------------------------------------------------------------------
Date: Thu, 17 Jun 93 07:16:43 CDT
From: andrew@titan.tsd.arlut.utexas.edu (Andrew Wheeler)
Subject: Re: GUS Programmer's Digest V2 #15
Message-ID: <9306171216.AA04120@titan.tsd.arlut.utexas.edu>
>Firstly, I guess you didn't read the disclaimer about support -- none to
>speak of. Secondly, what did you expect for free? If you want a proper
>SDK get the professional one and sign the disclaimer.
>
>Pete
>scheyen@csd.uwo.ca
That's strange - I signed the non-disclosure agreement and didn't really get
anything over what is available on the net. Am I missing something?
-andrew
andrew@mars.tsd.arlut.utexas.edu
------------------------------
Date: Thu, 17 Jun 93 9:46:25 BST
From: "James Andrews, User Support" <james@sol1.east-london.ac.uk>
Subject: pro developers kit
Message-ID: <15753.9306170846@uk.ac.uel.sol1>
>
> Date: Wed, 16 Jun 93 8:39:59 EDT
> From: Peter G.N. Scheyen <scheyen@csd.uwo.ca>
> Subject: Re: Gravis/FORTE - Please read this!!!
> Message-ID: <9306161240.AA19711@mccarthy.csd.uwo.ca>
>
> Firstly, I guess you didn't read the disclaimer about support -- none to
> speak of. Secondly, what did you expect for free? If you want a proper
> SDK get the professional one and sign the disclaimer.
>
> Pete
> scheyen@csd.uwo.ca
I signed the disclaimer but havent seen hide nor hair of the pro developers
kit.
As for the total lack of support, this group is the only place I'll be
asking if I get totally stuck
james@sol1.uel.ac.uk
------------------------------
Date: Thu, 17 Jun 1993 11:47:57 -0500 (EST)
From: James Reutter <jreutter@silver.ucs.indiana.edu>
Subject: Twos complement bit and DRAM download
Message-ID: <9306171648.AA27967@orca.es.com>
In response to my recent posting about degraded sound quality,
when using the UltraDownload function to load a sound file to
DRAM,
David MacMahon replied:
=================================
I noticed crappy sound when I thought I was playing a sine wave.
It turns out that setting the "convert to 2's comp" bit in the
"mode" byte of the call to UltraDownload made my sine wave
sound (and look) like a sine wave.
=================================
This was precisely the problem. In case anybody else out there is
doing the same thing, here are some details:
* Sound files were .SND files, provided as samples with the SDK,
or converted from .WAV format (same problem with all these files)
* UltraDownload function takes arguments dataptr, control, dram_loc,
len, wait [page 6 of 2.01 SDK documentation], where "control" is the
mode mask. Bit 7 (high-order bit) of the DMA control bit mask [page
78 of aforementioned doc.] is the bit to convert to 2's complement.
In my case, I set this bit to 1 [=do the convert]. In C, easiest way to
do this is to initialize "control" to zero, then set control |= 0x80
[i.e. bitwise OR control with hex 80 = 10000000 binary].
Without this bit set on, the sound is audible,
and, in our case, intelligible (we're using speech samples)
but highly distorted and staticky.
Apparently (correct me if I'm wrong) then, .SND format is
one's complement.
------------------------------
Date: Thu, 17 Jun 1993 20:51 EDT
From: GILMOUR@BINAH.CC.BRANDEIS.EDU
Subject: Weekly IRC
Message-ID: <01GZHYEX1HTC9N76A5@BINAH.CC.BRANDEIS.EDU>
I was wondering if I could drum up some support for a weekly (or whatever)
IRC (Internet Relay Chat) get together to talk about programming the GUS.
I'm rather new to programming in C and think this would be a great way to
supplement this newsletter. Any ideas?...
-Jeff
------------------------------
End of GUS Programmer's Digest V2 #16
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