[my first send bounced so I am resending] Here is some code to run on a SparcStaion (I or II) to generate random numbers based on noise from the audio chip. I have not tested the true randomness of the out but cause I don't know how. Thus if anyone can please do and send me the results. I suppose some minor tweeking can be made for the mid range gain for a better spread. unfortunatly there is no way to turn off the u-law audio compression the chip uses to outputs data if you plot the out put you will see the problem the compression caused. #! /bin/sh # here be a shar file echo x - Audio/Makefile cat >Audio/Makefile <<'!E!O!F!' LD= $(CC) CC= cc LDFLAGS=-g CFLAGS=-g -I/usr/demo/SOUND -I/usr/local/include LIBS= -L/usr/demo/SOUND/ -laudio audio_rand: audio_rand.o $(LD) $(LDFLAGS) audio_rand.o $(LIBS) -o $@ test: audio_rand audio_rand | head -10000 > \#fff echo "plot '#fff'" | gnuplot !E!O!F! #! /bin/sh echo x - Audio/audio_rand.c cat >Audio/audio_rand.c <<'!E!O!F!' static char *_author = "Peter Shipley\n"; #define AUDIO_CHIP #include <stdio.h> #include <fcntl.h> #include <sys/ioctl.h> #include <sun/audioio.h> #include <sbusdev/audio_79C30.h> #include <multimedia/ulaw2linear.h> static char *_who_did_it = "Peter M Shipley (1992) [v0.1]\n"; /* X: 0-15 R: 16-31 GX: 32-33 GR: 33-34 */ #define MMR2_BITS 45 #define GX_GAIN 32 main() { struct audio_ioctl ai; extern void bzero(); int fd; int j, i; if( (fd = open("/dev/audio", O_RDONLY)) < 0) { perror("open:"); exit(1); } bzero(ai, sizeof(struct audio_ioctl) ); ai.control = AUDIO_MAP_ALL; if ( ioctl( fd, AUDIOGETREG, &ai ) < 0 ) { perror( "AUDIOGETREG ALL:" ); exit(1); } /* set audio input to a unconnected pin (audio input B) */ ai.data[MMR2_BITS] = ( ai.data[MMR2_BITS] & ~AUDIO_MMR2_BITS_AINB); /* set gain of the GX reg to the max */ ai.data[GX_GAIN] = 0x7F; ai.data[GX_GAIN+1] = 0x0; for(i=0;;) { char buf[BUFSIZ]; read(fd, buf, BUFSIZ); for(j=0; j<BUFSIZ ; j++) printf("%d %d\n", i++, audio_u2s(buf[j])); } } !E!O!F! #! /bin/sh echo x - Audio/reg.c cat >Audio/reg.c <<'!E!O!F!' static char *_author = "Peter Shipley\n"; #define AUDIO_CHIP #include <stdio.h> #include <fcntl.h> #include <sys/ioctl.h> #include <sun/audioio.h> #include <sbusdev/audio_79C30.h> static char * print_byte(); static struct _map { char *label; char size; } map[] = { "X filter", 16, "R filter", 16, "GX Gain", 2, "GR Gain", 2, "GER Gain", 2, "Sidetone", 2, "Frequency Tone gen", 2, "Amplitude Tone gen", 2, "MMR1", 1, "MMR2", 1 }; #define NMAPS (sizeof(map) / sizeof(struct _map) ) struct audio_ioctl ai; main() { extern void bzero(); int fd; int oldmmr2; int newmmr2; if( (fd = open("/dev/audio", O_RDWR)) < 0) { perror("open:"); exit(1); } dump(fd); /* bzero(ai, sizeof(struct audio_ioctl) ); ai.control = AUDIO_MAP_GX; if ( ioctl( fd, AUDIOGETREG, &ai ) < 0 ) { perror( "AUDIOGETREG MMR2:" ); exit(1); } ai.data[0] = ai.data[1] = 0; if ( ioctl( fd, AUDIOSETREG, &ai ) < 0 ) { perror( "AUDIOSETREG MMR2:" ); exit(1); } */ sleep(5); dump(fd); } dump(f) int f; { int i,k; bzero(ai, sizeof(struct audio_ioctl) ); ai.control = AUDIO_MAP_ALL; if ( ioctl( f, AUDIOGETREG, &ai ) < 0 ) { perror( "AUDIOGETREG MMR2:" ); exit(1); } k=0; for(i = 0 ; i < NMAPS ; i++) { int j; (void) printf("%s:\n", map[i].label); for(j=1; j <= map[i].size; j++,k++) { (void) printf("%10s", print_byte(ai.data[k])); if ( (j % 7) == 0) (void) fputc('\n', stdout); } (void) fputc('\n', stdout); } (void) fputc('\n', stdout); } static char * print_byte(c) char c; { static char bt[9]; bt[0] = ( (c & 0x01) ? '1' : '0'); bt[1] = ( (c & 0x02) ? '1' : '0'); bt[2] = ( (c & 0x03) ? '1' : '0'); bt[3] = ( (c & 0x04) ? '1' : '0'); bt[4] = ( (c & 0x05) ? '1' : '0'); bt[5] = ( (c & 0x06) ? '1' : '0'); bt[6] = ( (c & 0x07) ? '1' : '0'); bt[7] = ( (c & 0x08) ? '1' : '0'); bt[8] = NULL; return bt; } !E!O!F!