# include "setup.h"

# define DRIVE0 0

static spt = 0;

# define NBIOSREC 20
# define BIOSFIRST 53


/*
 * Block I/O routines for the Micro Decision
 */


biosread ()
	{
	static char *p;
	static s, n;

	spt = findspt ();
	p = biosbuf;
	s = BIOSFIRST;
	for (n = 0; n < NBIOSREC; n++, p += RECSIZE, s++)
		if (lio (READ, p, s))
			fatal ("Can't read bios\n$");
	}

bioswrite ()
	{
	static char *p;
	static s, n;

	p = biosbuf;
	s = BIOSFIRST;
	for (n = 0; n < NBIOSREC; n++, p += RECSIZE, s++)
		if (lio (WRITE, p, s, n == NBIOSREC - 1))
			fatal ("Can't write bios\n$");
	}

lio (op, addr, sector, last)
	char *addr;
	{
	int t, s;

	sector--;
	t = sector / spt;
	s = sector % spt + 1;
	return sio (op, addr, t, s, last);
	}

sio (op, addr, track, sector, last)
	{
	static char selected [5] = {NO};

	callbios (SETDRV, DRIVE0, selected[DRIVE0]);
	selected[DRIVE0] = YES;
	callbios (SETTRK, track,  0);
	callbios (SETSEC, sector, 0);
	callbios (SETDMA, addr,   0);

	if (op == READ)
		return callbios (BIORED, 0, 0);
	else
		return callbios (BIOWRT, last, 0);
	}

# define CSELECT 14
# define CGETPARM 31