4f7
#include <stdio.h>
#include <dos.h>
#include <conio.h>
#include <malloc.h>
#include <ctrlc.h>
#include <rs232.h>


int main(void)
{
	unsigned int c;

	ctrlc_dis();
	if(! comm_init())
		exit(1);

	while(1)
	{
		if( c = comm_rcv())
			putchar((unsigned char)c);


		if(ctrlc) {
			ctrlc--;
			comm_send(0x03);
		}
		if(ctrls) {
			ctrls--;
			comm_send(0x13);
		}
		if(ctrlq) {
			ctrlq--;
			comm_send(0x10);
		}

		if(kbhit()) {
			c = getch();
			if(c == 27)
				break;
			comm_send(c);
		}
	}

	comm_exit();
	ctrlc_ena();
}


comm_init()
{
	long far *p;

	p = MK_FP(0, 0x0180);
	if(*p == 0L)
	{
		printf("Error: COMMTSR not installed!\n");
		return 0;
	}

	rs.portadr = 0x2f8;
	rs.irq = 3;
	rs.baudrate = 9600;
	rs.parity = 0;
	rs.wordlen = 8;
	rs.stopbits = 1;

	asm	push es
	asm	push di

	_ES = FP_SEG(&rs);
	_DI = FP_OFF(&rs);
	_AH = COMM_INIT;
	geninterrupt(0x60);

	asm	pop di
	asm	pop es
	return 1;
}


comm_exit()
{
	_AH = COMM_EXIT;
	geninterrupt(0x60);
}


comm_send(unsigned char c)
{
	while(1) {
		_AH = COMM_SEND;
		_AL = c;
		geninterrupt(0x60);
		if(_AX != 0) break;
		if(kbhit()) break;
	}
}


comm_rcv()
{
	_AH = COMM_RCV;
	geninterrupt(0x60);
}
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