38  * Frames begin with a two-octet preamble PR-PR followyd by the
48  *	+------+------+------+------+------+--//--+------+
50  *	+------+------+------+------+------+--//--+------+
64  * icom_freq(fd, ident, freq) - load radio frequency
68  * -1 (error)
81 	int rc;  in icom_freq()  local
89 	rc = write(fd, cmd, temp + 7);  in icom_freq()
90 	if (rc == -1) {  in icom_freq()
92 		return -1;  in icom_freq()
93 	} else if (rc != temp + 7) {  in icom_freq()
95 			rc, temp+7);  in icom_freq()
104  * doublefreq(freq, y, len) - double to ICOM frequency with padding
115 	char *y;  in doublefreq()  local
118 	y = s1 + 10;  in doublefreq()
120 	while (*y != ' ') {  in doublefreq()
121 		x[i] = *y-- & 0x0f;  in doublefreq()
122 		x[i] = x[i] | ((*y-- & 0x0f) << 4);  in doublefreq()
131  * icom_init() - open and initialize serial interface
134  * is, character-at-a-time, no stripping, checking or monkeying with the
136  * character or a 0.5-s timeout.
146 	int rc;  in icom_init()  local
151 		return -1;  in icom_init()
153 	rc = tcgetattr(fd, &ttyb);  in icom_init()
154 	if (rc < 0) {  in icom_init()
158 		return -1;  in icom_init()
168 	rc = tcsetattr(fd, TCSANOW, &ttyb);  in icom_init()
169 	if (rc < 0) {  in icom_init()
173 		return -1;  in icom_init()