Category : Music and Digitized Voice
Archive   : PAS-SDK1.ZIP
Filename : PHASE.C
; /*\
;---|*|----====< phase >====----
;---|*|
;---|*| This program demonstrates the phase effects of throwing the FM
;---|*| chips frequencies out of phase when playing a note
;---|*|
; \*/
#include
; /*\
;---|*|----====< main >====----
; \*/
main()
{
// initialize the FM interface
mvFMInitMode(1); // 1 = split mode
// Load the FM patch
LoadPatch();
// Play each side of the chip a little differently
dophase (0);
dophase (1);
dophase (2);
dophase (4);
dophase (8);
dophase (16);
dophase (32);
// turn off the audio
outdual3812 (0xB0, 0x00, 0x00);
printf ("\noff...\n");
}
; /*\
;---|*|----====< dophase >====----
;---|*|
;---|*| Play each half of the FM chip with an adjusted frequency
;---|*|
; \*/
dophase(offst)
int offst;
{
if (offst)
printf ("\nfrequency off center by %d...",offst);
else
printf ("\nNo phase shifting...");
outdual3812
(
0xA0,
0x6B+offst,
0x6B-offst
);
outdual3812 (0xB0, 0x35, 0x35); // KEY-ON=1, block=5, f(9,10)=01
outdual3812 (0xB0, 0x15, 0x15); // KEY-ON=0, block=5, f(9,10)=01
printf ("type any key to continue...");
getch();
}
; /*\
;---|*|----====< LoadPatch >====----
;---|*|
;---|*| Load the FM chip with a patch
;---|*|
; \*/
LoadPatch(offst)
int offst;
{
outdual3812 (0x20, 0x01, 0x01); // multiple = 1
outdual3812 (0x40, 0x00, 0x00); // volume on high
outdual3812 (0x60, 0xF0, 0xF0); // Attack = F, Decay = 0
outdual3812 (0x80, 0xF1, 0xF1); // Sustain = F, Release = 1
outdual3812 (0xC0, 0x11, 0x21); // Left connect = 11h, right = 21h
}
Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!
This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.
But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: http://www.os2museum.com/wp/mtswslnk/