PARTNO		U124 ;
		NAME            U124 ;
		DATE            October 15, 1992 ;
		REV             0 ;
		DESIGNER        Dave Haynie ;
		COMPANY         Commodore ;
		ASSEMBLY        Nyx ;
		LOCATION        West Chester ;
		DEVICE		g22v10 ;

/************************************************************************/
/*									*/
/*  	Nyx	Primary clock selector					*/
/*									*/
/*	This PAL generates the four clock sources to be used for any	*/
/*	given setup.  It can use MONID to pick which four clocks are	*/
/*	available. 							*/
/*									*/
/************************************************************************/
/*  Allowable Target Device Types: 22V10-10				*/
/************************************************************************/
/*  Clock:		NONE						*/
/************************************************************************/
/*  Free Pins:		NONE
/************************************************************************/
/*  HISTORY								*/
/*	DBH Oct 15:	Completely new.					*/
/************************************************************************/

/** INPUTS: **/

PIN 1		=  DUAL_SING	;	/* Type of AAA system. */
PIN 2		=  MONID2	;	/* Monitor ID codes. */
PIN 3		=  MONID1	;
PIN 4		=  MONID0	;
PIN 5		=  C57M		;	/* Video clocks */
PIN 6		=  C28M		;
PIN 7		=  C14M		;
PIN 8		=  C7M		;
PIN 9		= !CPUCLK	;	/* The system clock */
PIN 10		=  ACL		;	/* Auxilary clocks */
PIN 11		=  BCL		;
PIN 13		=  CCL		;

PIN 14		=  ADIV4	;	/* Clock divider inputs */
PIN 15		=  ADIV2	;
PIN 22		=  BDIV2	;
PIN 23		=  BDIV4	;

/** OUTPUTS: **/

PIN 16		=  ADIVC	;	/* Clock for A-divider */
PIN [17..20]	= [FREQ0..3]	;	/* Clock outputs */
PIN 21		=  BDIVC	;	/* Clock for B-divider */

/** OUTPUT TERMS: **/

/* For the moment, we aren't doing anything with the auxilary clocks or
   external dividers. */

ADIVC		= 'b'1;
BDIVC		= 'b'1;

/* The output frequencies are dependent on DUAL_SING only for now.  A
   future setup can take advantage of the extra clocks and MONIDs. */

FREQ0		= C14M & !DUAL_SING
		# C7M  &  DUAL_SING;

FREQ1		= C28M & !DUAL_SING
		# C14M &  DUAL_SING;

FREQ2		= C57M & !DUAL_SING
		# C28M &  DUAL_SING;

FREQ3		= C57M & !DUAL_SING
		# C57M &  DUAL_SING;