/*
	rom emurator
	lowlevel routine header
		T.Tsuda. , DSA	October 16,1996
*/

#ifdef	RAMIO
#define	EXTERN
#else
#define	EXTERN	extern
#endif


/*	lpt port address & data

Data port assignment : write data

Status port assignment :  N/A

Control port assignment

Bit: LPT signal  | Assign
----------------------------------
 0 : -Strobe     |  AINC   Address counter incriment. falling edge:incriment.
 1 : -AutoFDXT   |  WR     RAM write enable. 0:write enable
 2 :  INIT       | -CLR    Clear Address counter. 0:clear
 3 : -SLCTIN     |  DIR    Direction. 1(L):Terget port , 0(H):AT Host port
 4 :  IRQEN      |  0      (disable)
 5 : (direction) |  0      (output)
 6 :  N/A        | 
 7 :  N/A        | 

*/


/*	LOW level I/O routine	*/

/*	macros	*/
#ifdef	RAMIO
#define	DATAP		lpt_addr[lpt_num]			/* lpt data port address */
#define	STATUSP		(lpt_addr[lpt_num] + 1)		/* lpt status port address */
#define	CONTROLP	(lpt_addr[lpt_num] + 2)		/* lpt control port address */
#endif


/*	externals	*/

EXTERN unsigned int	lpt_addr[5];	/* lpt[n] port base address */
EXTERN int	lpt_num;			/* lpt port number */

#define	DIRAT	0
#define	DIRROM	1
#define	PORTSTBY	0
#define	PORTAINC	1
#define	PORTWR	2
#define	PORTCLR	3

EXTERN int	direction		/* emuration ram direction */
#ifdef	RAMIO
 = DIRAT
#endif
;

#ifdef	RAMIO
int	cport[2][4] = {
   /*stby,ainc, wr , clr */
	{0x07,0x06,0x05,0x03},	/* direction to AT port */
	{0x0f,0x0e,0x0d,0x0b}	/* direction to terget ROM */
};
#endif


/*	function of prottypes	*/

void	get_lpt(void);
int	initport(void);
void	ramdir(int dir);
void	addrinc(void);
void	ramwrite(int data);
void	addrclr(void);
void	twait();


#undef	EXTERN