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rcornwell.sims/IBM360/ibm360_com.c
Richard Cornwell 39e74465fc IBM360: Fixed some minor bugs.
2019-03-10 14:27:08 -04:00

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/* ibm360_com.c: IBM 360 2703 communications controller
Copyright (c) 2017, Richard Cornwell
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
RICHARD CORNWELL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "ibm360_defs.h"
#include "sim_sock.h"
#include "sim_tmxr.h"
#ifdef NUM_DEVS_COM
#define UNIT_COM TT_MODE_7B
/* u3 */
#define CMD_RD 0x02 /* Read in data from com line */
#define CMD_WR 0x01 /* Write data to com line */
#define CMD_NOP 0x03 /* Nop command */
#define CMD_DIAL 0x29 /* Dial call */
#define CMD_BRK 0x0D /* Send break signal */
#define CMD_PREP 0x06 /* Wait for incoming data */
#define CMD_INH 0x0A /* Read data without timeout */
#define CMD_SRCH 0x0E /* Wait for EOT character */
#define CMD_ENB 0x27 /* Enable line */
#define CMD_DIS 0x2F /* Disable line */
/* u3 second byte */
#define RECV 0x0100 /* Recieving data */
#define SEND 0x0200 /* Sending data */
#define ENAB 0x0400 /* Line enabled */
#define POLL 0x0800 /* Waiting for connection */
/* u5 */
/* Sense byte 0 */
#define SNS_CMDREJ 0x80 /* Command reject */
#define SNS_INTVENT 0x40 /* Unit intervention required */
#define SNS_BUSCHK 0x20 /* Parity error on bus */
#define SNS_EQUCHK 0x10 /* Equipment check */
#define SNS_DATCHK 0x08 /* Data Check */
#define SNS_OVRRUN 0x04 /* Data overrun */
#define SNS_RECV 0x02 /* Receiving */
#define SNS_TIMEOUT 0x01 /* Timeout */
/* u6 */
uint8 coml_startcmd(UNIT *uptr, uint16 chan, uint8 cmd) ;
uint8 coml_haltio(UNIT *uptr);
t_stat coml_srv(UNIT *uptr);
void coml_ini(UNIT *uptr, t_bool);
t_stat com_reset(DEVICE *dptr);
t_stat com_scan(UNIT *uptr);
t_stat com_attach(UNIT *uptr, CONST char *);
t_stat com_detach(UNIT *uptr);
TMLN com_ldsc[NUM_UNITS_COM];
TMXR com_desc = { NUM_UNITS_COM, 0, 0, com_ldsc};
int32 tmxr_poll = 10000;
MTAB com_mod[] = {
{MTAB_XTD | MTAB_VUN | MTAB_VALR, 0, "DEV", "DEV", &set_dev_addr,
&show_dev_addr, NULL},
{0}
};
MTAB coml_mod[] = {
{ TT_MODE, TT_MODE_KSR, "KSR", "KSR", NULL },
{ TT_MODE, TT_MODE_7B, "7b", "7B", NULL },
{ TT_MODE, TT_MODE_8B, "8b", "8B", NULL },
{ TT_MODE, TT_MODE_7P, "7p", "7P", NULL },
{0}
};
UNIT com_unit[] = {
{UDATA(&com_scan, UNIT_ATTABLE | UNIT_IDLE, 0)}, /* Line scanner */
};
UNIT coml_unit[] = {
{UDATA(&coml_srv, UNIT_COM, 0), 0, UNIT_ADDR(0x030)}, /* 0 */
{UDATA(&coml_srv, UNIT_COM, 0), 0, UNIT_ADDR(0x031)}, /* 1 */
{UDATA(&coml_srv, UNIT_COM, 0), 0, UNIT_ADDR(0x032)}, /* 2 */
{UDATA(&coml_srv, UNIT_COM, 0), 0, UNIT_ADDR(0x033)}, /* 3 */
{UDATA(&coml_srv, UNIT_COM, 0), 0, UNIT_ADDR(0x034)}, /* 4 */
{UDATA(&coml_srv, UNIT_COM, 0), 0, UNIT_ADDR(0x035)}, /* 5 */
{UDATA(&coml_srv, UNIT_COM, 0), 0, UNIT_ADDR(0x036)}, /* 6 */
{UDATA(&coml_srv, UNIT_COM, 0), 0, UNIT_ADDR(0x037)}, /* 7 */
{UDATA(&coml_srv, UNIT_COM, 0), 0, UNIT_ADDR(0x038)}, /* 8 */
{UDATA(&coml_srv, UNIT_COM, 0), 0, UNIT_ADDR(0x039)}, /* 9 */
{UDATA(&coml_srv, UNIT_COM, 0), 0, UNIT_ADDR(0x03A)}, /* A */
{UDATA(&coml_srv, UNIT_COM, 0), 0, UNIT_ADDR(0x03B)}, /* B */
{UDATA(&coml_srv, UNIT_COM, 0), 0, UNIT_ADDR(0x03C)}, /* C */
{UDATA(&coml_srv, UNIT_COM, 0), 0, UNIT_ADDR(0x03D)}, /* D */
{UDATA(&coml_srv, UNIT_COM, 0), 0, UNIT_ADDR(0x03E)}, /* E */
{UDATA(&coml_srv, UNIT_COM, 0), 0, UNIT_ADDR(0x03F)}, /* F */
};
struct dib com_dib = { 0xF0, NUM_UNITS_COM, NULL, coml_startcmd,
coml_haltio, coml_unit, coml_ini};
DEVICE com_dev = {
"COM", com_unit, NULL, com_mod,
NUM_DEVS_COM, 8, 15, 1, 8, 8,
NULL, NULL, com_reset, NULL, &com_attach, &com_detach,
NULL, DEV_MUX | DEV_DISABLE | DEV_DEBUG, 0, dev_debug
};
DEVICE coml_dev = {
"COML", coml_unit, NULL, coml_mod,
NUM_UNITS_COM, 8, 15, 1, 8, 8,
NULL, NULL, NULL, NULL, NULL, NULL,
&com_dib, DEV_DISABLE | DEV_DEBUG, 0, dev_debug
};
static const uint8 com_2741_in[128] = {
/* SOH STX ETX EOT ENQ ACK BEL */
0000, 0000, 0000, 0000, 0x1F, 0000, 0000, 0000, /*0-37*/
/* 8 9 A B C D E F */
/*BS HT LF VT FF CR SO SI */
0x5D, 0x7a, 0x5B, 0000, 0000, 0x1f, 0000, 0000,
/*DLE DC1 DC2 DC3 DC4 NAK SYN ETB */
0000, 0000, 0000, 0000, 0000, 0000, 0000, 0000,
/*CAN EM SUB ESC FS GS RS US */
0000, 0000, 0000, 0000, 0000, 0000, 0000, 0000,
/* sp ! " # $ % & ' */
0x81, 0xd7, 0x96, 0x16, 0x57, 0x8b, 0x61, 0x8d, /* 40 - 77 */
/* ( ) * + , - . / */
0x93, 0x95, 0x90, 0xe1, 0166, 0x40, 0067, 0x23, /* / = cS x37 */
/* 0 1 2 3 4 5 6 7 */
0x15, 0x02, 0x04, 0x07, 0x08, 0x0b, 0x0d, 0x0e,
/* 8 9 : ; < = > ? */
0x10, 0x13, 0x88, 0x87, 0x84, 0x82, 0x8e, 0xa3,
/* @ A B C D E F G */
0x20, 0xe2, 0xe4, 0xe7, 0xe8, 0xeb, 0xed, 0xee, /* 100 - 137 */
/* H I J K L M N O */
0xf0, 0xf3, 0xc3, 0xc5, 0xc6, 0xc9, 0xca, 0xcc,
/* P Q R S T U V W */
0xcf, 0xd1, 0xd2, 0xa5, 0xa6, 0xa9, 0xaa, 0xac,
/* X Y Z [ \ ] ^ _ */
0xaf, 0xb1, 0xb2, 0000, 0000, 0000, 0000, 0000,
/* ` a b c d e f g */
0000, 0x62, 0x64, 0x67, 0x68, 0x6b, 0x6d, 0x6e, /* 140 - 177 */
/* h i j k l m n o */
0x70, 0x73, 0x43, 0x45, 0x46, 0x49, 0x4a, 0x4c,
/* p q r s t u v w */
0x4f, 0x51, 0x52, 0x25, 0x26, 0x29, 0x2a, 0x2c,
/* x y z { | } ~ del*/
0x2f, 0x31, 0x32, 0000, 0xb7, 0000, 0xf9, 0x7f
};
static const uint8 com_2741_out[256] = {
/* 0, 1, 2, 3, 4, 5, 6, 7, */
0xff, ' ', '1', 0xff, '2', 0xff, 0xff, '3', /* 0x0x */
/* 8, 9, A, B, C, D, E, F, */
'4', 0xff, 0xff, '5', 0xff, '6', '7', 0xff,
/* 0, 1, 2, 3, 4, 5, 6, 7, */
'8', 0xff, 0xff, '9', 0xff, '0', '#', 0xff, /* 0x1x */
/* 8, 9, A, B, C, D, E, F, */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x04,
/* 0, 1, 2, 3, 4, 5, 6, 7, */
'@', 0xff, 0xff, '/', 0xff, 's', 't', 0xff, /* 0x2x */
/* 8, 9, A, B, C, D, E, F, */
0xff, 'u', 'v', 0xff, 'w', 0xff, 'x', 0xff,
/* 0, 1, 2, 3, 4, 5, 6, 7, */
0xff, 'y', 'z', 0xff, 0xff, 0xff, 0xff, '/', /* 0x3x */
/* 8, 9, A, B, C, D, E, F, */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
/* 0, 1, 2, 3, 4, 5, 6, 7, */
'-', 0xff, 0xff, 'i', 0xff, 'k', 'l', 0xff, /* 0x4x */
/* 8, 9, A, B, C, D, E, F, */
0xff, 'm', 'n', 0xff, 'o', 0xff, 0xff, 'p',
/* 0, 1, 2, 3, 4, 5, 6, 7, */
0xff, 'q', 'r', 0xff, 0xff, 0xff, 0xff, '$', /* 0x5x */
/* 8, 9, A, B, C, D, E, F, */
0xff, 0xff, 0xff, 0x0a, 0xff, 0x08, 0xff, 0xff,
/* 0, 1, 2, 3, 4, 5, 6, 7, */
0xff, '&', 'a', 0xff, 'b', 0xff, 0xff, 'c', /* 0x6x */
/* 8, 9, A, B, C, D, E, F, */
'd', 0xff, 0xff, 'e', 0xff, 'f', 'g', 0xff,
/* 0, 1, 2, 3, 4, 5, 6, 7, */
'h', 0xff, 0xff, 'i', 0xff, 0xff, 0xff, 0xff, /* 0x7x */
/* 8, 9, A, B, C, D, E, F, */
0xff, 0xff, 0x09, 0xff, 0xff, 0xff, 0xff, 0x7f,
/* 0, 1, 2, 3, 4, 5, 6, 7, */
0xff, ' ', '=', 0xff, '<', 0xff, 0xff, ';', /* 0x8x */
/* 8, 9, A, B, C, D, E, F, */
':', 0xff, 0xff, '%', 0xff, '\'', '>', 0xff,
/* 0, 1, 2, 3, 4, 5, 6, 7, */
'*', 0xff, 0xff, '(', 0xff, ')', '"', 0xff, /* 0x9x */
/* 8, 9, A, B, C, D, E, F, */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
/* 0, 1, 2, 3, 4, 5, 6, 7, */
0xff, 0xff, 0xff, '?', 0xff, 'S', 'T', 0xff, /* 0xAx */
/* 8, 9, A, B, C, D, E, F, */
0xff, 'U', 'V', 0xff, 'W', 0xff, 0xff, 'X',
/* 0, 1, 2, 3, 4, 5, 6, 7, */
0xff, 'Y', 'Z', 0xff, 0xff, 0xff, 0xff, '|', /* 0xBx */
/* 8, 9, A, B, C, D, E, F, */
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
/* 0, 1, 2, 3, 4, 5, 6, 7, */
0xff, '-', 0xff, 'J', 0xff, 'K', 'L', 0xff, /* 0xCx */
/* 8, 9, A, B, C, D, E, F, */
0xff, 'M', 'N', 0xff, 'O', 0xff, 0xff, 'P',
/* 0, 1, 2, 3, 4, 5, 6, 7, */
0xff, 'Q', 'R', 0xff, 0xff, 0xff, 0xff, '!', /* 0xDx */
/* 8, 9, A, B, C, D, E, F, */
0xff, 0xff, 0xff, 0x0a, 0xff, 0x08, 0xff, 0xff,
/* 0, 1, 2, 3, 4, 5, 6, 7, */
0xff, '+', 'A', 0xff, 'B', 0xff, 0xff, 'C', /* 0xEx */
/* 8, 9, A, B, C, D, E, F, */
'D', 0xff, 0xff, 'E', 0xff, 'F', 'G', 0xff,
/* 0, 1, 2, 3, 4, 5, 6, 7, */
'H', 0xff, 0xff, 'I', 0xff, 0xff, '~', 0xff, /* 0xFx */
/* 8, 9, A, B, C, D, E, F, */
0xff, 0xff, 0x09, 0xff, 0xff, 0xff, 0xff, 0x7f
};
uint8 coml_startcmd(UNIT *uptr, uint16 chan, uint8 cmd) {
uint16 addr = GET_UADDR(uptr->u3);
DEVICE *dptr = find_dev_from_unit(uptr);
int unit = (uptr - dptr->units);
uint8 ch;
sim_debug(DEBUG_CMD, dptr, "CMD unit=%d %x\n", unit, cmd);
if ((uptr->u3 & 0xff) != 0) {
return SNS_BSY;
}
switch (cmd & 0x3) {
case 0x3: /* Control */
if (cmd == CMD_NOP)
break;
case 0x1: /* Write command */
case 0x2: /* Read command */
uptr->u3 |= cmd;
sim_activate(uptr, 200);
return 0;
case 0x0: /* Status */
if (cmd == 0x4) { /* Sense */
uptr->u3 |= cmd;
sim_activate(uptr, 200);
return 0;
}
break;
}
if (uptr->u5 & 0xff)
return SNS_CHNEND|SNS_DEVEND|SNS_UNITCHK;
return SNS_CHNEND|SNS_DEVEND;
}
uint8 coml_haltio(UNIT *uptr) {
uint16 addr = GET_UADDR(uptr->u3);
DEVICE *dptr = find_dev_from_unit(uptr);
int unit = (uptr - dptr->units);
int cmd = uptr->u3 & 0xff;
uint8 ch;
sim_debug(DEBUG_CMD, dptr, "HLTIO unit=%d %x\n", unit, cmd);
switch (cmd) {
case 0:
case CMD_DIS: /* Disable line */
case CMD_DIAL: /* Dial call */
case 0x4:
/* Short commands nothing to do */
return 0;
case CMD_INH: /* Read data without timeout */
case CMD_RD: /* Read in data from com line */
case CMD_WR: /* Write data to com line */
case CMD_BRK: /* Send break signal */
case CMD_PREP: /* Wait for incoming data */
case CMD_SRCH: /* Wait for EOT character */
uptr->u3 &= ~0xffff;
chan_end(addr, SNS_CHNEND|SNS_DEVEND);
break;
case CMD_ENB: /* Enable line */
/* Terminate the operation */
(void)tmxr_set_get_modem_bits(&com_ldsc[unit], 0, TMXR_MDM_DTR, NULL);
(void)tmxr_reset_ln(&com_ldsc[unit]);
uptr->u3 &= ~0xffff;
break;
}
return SNS_CHNEND|SNS_DEVEND;
}
/* Handle per unit commands */
t_stat coml_srv(UNIT * uptr)
{
uint16 addr = GET_UADDR(uptr->u3);
DEVICE *dptr = find_dev_from_unit(uptr);
int unit = (uptr - dptr->units);
int cmd = uptr->u3 & 0xff;
uint8 ch;
switch (cmd) {
case 0:
break;
case 0x4:
ch = uptr->u5 & 0xff;
sim_debug(DEBUG_DETAIL, dptr, "sense unit=%d 1 %x\n", unit, ch);
chan_write_byte(addr, &ch) ;
uptr->u3 &= ~0xff;
chan_end(addr, SNS_CHNEND|SNS_DEVEND);
break;
case CMD_DIAL: /* Dial call */
uptr->u5 = SNS_CMDREJ;
chan_end(addr, SNS_CHNEND|SNS_DEVEND|SNS_UNITCHK);
break;
case CMD_INH: /* Read data without timeout */
case CMD_RD: /* Read in data from com line */
if (uptr->u3 & ENAB) {
if (tmxr_rqln(&com_ldsc[unit]) > 0) {
int32 data = tmxr_getc_ln (&com_ldsc[unit]);
sim_debug(DEBUG_DATA, dptr, "COML: unit=%d read '%c'\n", unit, data);
if (data & SCPE_BREAK) {
uptr->u3 &= ~0xff;
chan_end(addr, SNS_CHNEND|SNS_DEVEND|SNS_UNITCHK);
return SCPE_OK;
} else {
ch = sim_tt_inpcvt (data, TT_GET_MODE(uptr->flags) |
TTUF_KSR);
ch = com_2741_in[data & 0x7f];
if (chan_write_byte( addr, &ch)) {
uptr->u3 &= ~0xff;
chan_end(addr, SNS_CHNEND|SNS_DEVEND);
return SCPE_OK;
}
if (ch == 0x1f) {
uptr->u3 &= ~0xff;
chan_end(addr, SNS_CHNEND|SNS_DEVEND|SNS_UNITEXP);
return SCPE_OK;
}
}
}
sim_activate(uptr, 200);
}
break;
case CMD_WR: /* Write data to com line */
if (uptr->u3 & ENAB) {
sim_debug(DEBUG_CMD, dptr, "COM: unit=%d write\n", unit);
if (chan_read_byte (addr, &ch)) {
uptr->u3 &= ~0xff;
chan_end(addr, SNS_CHNEND|SNS_DEVEND);
} else {
int32 data;
data = com_2741_out[ch];
data = sim_tt_outcvt(data, TT_GET_MODE(uptr->flags) |
TTUF_KSR);
tmxr_putc_ln( &com_ldsc[unit], data);
sim_activate(uptr, 200);
}
} else {
sim_debug(DEBUG_CMD, dptr, "COM: unit=%d write error\n", unit);
uptr->u3 &= ~0xff;
chan_end(addr, SNS_CHNEND|SNS_DEVEND|SNS_UNITEXP);
}
break;
case CMD_BRK: /* Send break signal */
uptr->u3 &= ~0xff;
chan_end(addr, SNS_CHNEND|SNS_DEVEND);
break;
case CMD_PREP: /* Wait for incoming data */
if (uptr->u3 & ENAB) {
if (tmxr_rqln(&com_ldsc[unit]) > 0) {
uptr->u3 &= ~0xff;
chan_end(addr, SNS_CHNEND|SNS_DEVEND);
} else
sim_activate(uptr, 200);
} else {
uptr->u3 &= ~0xff;
chan_end(addr, SNS_CHNEND|SNS_DEVEND|SNS_UNITEXP);
}
break;
case CMD_SRCH: /* Wait for EOT character */
uptr->u3 &= ~0xff;
chan_end(addr, SNS_CHNEND|SNS_DEVEND);
break;
case CMD_ENB: /* Enable line */
if ((uptr->u3 & (POLL|ENAB)) == ENAB) {
uptr->u3 &= ~0xff;
sim_debug(DEBUG_CMD, dptr, "COM: unit=%d enable connect\n", unit);
chan_end(addr, SNS_CHNEND|SNS_DEVEND);
} else if ((uptr->u3 & POLL) == 0) {
sim_debug(DEBUG_CMD, dptr, "COM: unit=%d enable\n", unit);
(void)tmxr_set_get_modem_bits(&com_ldsc[unit], TMXR_MDM_DTR,
0, NULL);
uptr->u3 |= POLL;
}
break;
case CMD_DIS: /* Disable line */
sim_debug(DEBUG_CMD, dptr, "COM: unit=%d disable\n", unit);
(void)tmxr_set_get_modem_bits(&com_ldsc[unit], 0, TMXR_MDM_DTR, NULL);
(void)tmxr_reset_ln(&com_ldsc[unit]);
uptr->u3 &= ~(0xff|POLL|ENAB) ;
chan_end(addr, SNS_CHNEND|SNS_DEVEND);
break;
}
return SCPE_OK;
}
/* Scan for new connections, flush and poll for data */
t_stat com_scan(UNIT * uptr)
{
UNIT *line;
int32 ln;
sim_activate(uptr, tmxr_poll); /* continue poll */
if ((uptr->flags & UNIT_ATT) == 0) /* attached? */
return SCPE_OK;
ln = tmxr_poll_conn (&com_desc); /* look for connect */
sim_debug(DEBUG_DETAIL, &com_dev, "COM Poll %d\n", ln);
if (ln >= 0) { /* got one? rcv enb*/
line = &coml_unit[ln];
sim_debug(DEBUG_DETAIL, &com_dev, "COM line connect %d\n", ln);
if (line->u3 & ENAB) /* Already connected */
return SCPE_OK;
if ((line->u3 & POLL) == 0) { /* Check if not polling */
(void)tmxr_set_get_modem_bits(&com_ldsc[ln], 0,
TMXR_MDM_DTR, NULL);
(void)tmxr_reset_ln(&com_ldsc[ln]);
} else {
com_ldsc[ln].rcve = 1; /* Mark as ok */
line->u3 &= ~POLL;
line->u3 |= ENAB;
sim_debug(DEBUG_DETAIL, &com_dev, "COM line connect %d\n", ln);
sim_activate(line, 200);
}
}
tmxr_poll_tx(&com_desc);
tmxr_poll_rx(&com_desc);
return SCPE_OK;
}
t_stat
com_reset(DEVICE * dptr)
{
sim_activate(&com_unit[0], tmxr_poll);
return SCPE_OK;
}
void
coml_ini(UNIT * uptr, t_bool f)
{
UNIT *srv;
}
t_stat
com_attach(UNIT * uptr, CONST char *cptr)
{
t_stat r;
int i;
if ((r = tmxr_attach(&com_desc, uptr, cptr)) != SCPE_OK)
return r;
for (i = 0; i< com_desc.lines; i++) {
// (void)tmxr_set_line_modem_control(&com_ldsc[i], TRUE);
// (void)tmxr_set_get_modem_bits(&com_ldsc[i], 0, TMXR_MDM_DTR, NULL);
// (void)tmxr_reset_ln(&com_ldsc[i]);
coml_unit[i].u3 &= ~0xffff;
}
sim_activate(uptr, tmxr_poll);
return SCPE_OK;
}
t_stat
com_detach(UNIT * uptr)
{
t_stat r;
int i;
UNIT *srv;
for (i = 0; i< com_desc.lines; i++) {
(void)tmxr_set_get_modem_bits(&com_ldsc[i], 0, TMXR_MDM_DTR, NULL);
(void)tmxr_reset_ln(&com_ldsc[i]);
coml_unit[i].u3 &= ~0xffff;
}
sim_cancel(uptr);
r = tmxr_detach(&com_desc, uptr);
return r;
}
t_stat com_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag,
const char *cptr)
{
int i;
fprint_set_help (st, dptr);
fprint_show_help (st, dptr);
return SCPE_OK;
}
const char *com_description (DEVICE *dptr)
{
return "IBM 2701 communications controller";
}
#endif
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