262 lines
7.6 KiB
C
262 lines
7.6 KiB
C
/* altair_sio: MITS Altair serial I/O card
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Copyright (c) 1997-2005, Charles E. Owen
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of Charles E. Owen shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from Charles E. Owen.
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These functions support a simulated MITS 2SIO interface card.
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The card had two physical I/O ports which could be connected
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to any serial I/O device that would connect to a current loop,
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RS232, or TTY interface. Available baud rates were jumper
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selectable for each port from 110 to 9600.
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All I/O is via programmed I/O. Each each has a status port
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and a data port. A write to the status port can select
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some options for the device (0x03 will reset the port).
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A read of the status port gets the port status:
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+---+---+---+---+---+---+---+---+
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| X X X X X X O I |
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+---+---+---+---+---+---+---+---+
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I - A 1 in this bit position means a character has been received
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on the data port and is ready to be read.
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O - A 1 in this bit means the port is ready to receive a character
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on the data port and transmit it out over the serial line.
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A read to the data port gets the buffered character, a write
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to the data port writes the character to the device.
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*/
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#include <stdio.h>
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#include "altair_defs.h"
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#define UNIT_V_ANSI (UNIT_V_UF + 0) /* ANSI mode */
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#define UNIT_ANSI (1 << UNIT_V_ANSI)
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t_stat sio_svc (UNIT *uptr);
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t_stat sio_reset (DEVICE *dptr);
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t_stat ptr_svc (UNIT *uptr);
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t_stat ptr_reset (DEVICE *dptr);
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t_stat ptp_svc (UNIT *uptr);
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t_stat ptp_reset (DEVICE *dptr);
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int32 ptr_stopioe = 0, ptp_stopioe = 0; /* stop on error */
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/* 2SIO Standard I/O Data Structures */
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UNIT sio_unit = { UDATA (&sio_svc, 0, 0), KBD_POLL_WAIT };
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REG sio_reg[] = {
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{ ORDATA (DATA, sio_unit.buf, 8) },
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{ ORDATA (STAT, sio_unit.u3, 8) },
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{ NULL }
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};
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MTAB sio_mod[] = {
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{ UNIT_ANSI, 0, "TTY", "TTY", NULL },
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{ UNIT_ANSI, UNIT_ANSI, "ANSI", "ANSI", NULL },
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{ 0 }
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};
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DEVICE sio_dev = {
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"2SIO", &sio_unit, sio_reg, sio_mod,
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1, 10, 31, 1, 8, 8,
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NULL, NULL, &sio_reset,
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NULL, NULL, NULL
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};
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UNIT ptr_unit = { UDATA (&ptr_svc, UNIT_SEQ + UNIT_ATTABLE + UNIT_ROABLE, 0), KBD_POLL_WAIT };
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REG ptr_reg[] = {
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{ ORDATA (DATA, ptr_unit.buf, 8) },
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{ ORDATA (STAT, ptr_unit.u3, 8) },
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{ ORDATA (POS, ptr_unit.pos, T_ADDR_W) },
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{ NULL }
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};
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DEVICE ptr_dev = {
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"PTR", &ptr_unit, ptr_reg, NULL,
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1, 10, 31, 1, 8, 8,
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NULL, NULL, &ptr_reset,
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NULL, NULL, NULL
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};
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UNIT ptp_unit = { UDATA (&ptp_svc, UNIT_SEQ + UNIT_ATTABLE, 0), KBD_POLL_WAIT };
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REG ptp_reg[] = {
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{ ORDATA (DATA, ptp_unit.buf, 8) },
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{ ORDATA (STAT, ptp_unit.u3, 8) },
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{ ORDATA (POS, ptp_unit.pos, T_ADDR_W) },
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{ NULL }
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};
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DEVICE ptp_dev = {
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"PTP", &ptp_unit, ptp_reg, NULL,
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1, 10, 31, 1, 8, 8,
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NULL, NULL, &ptp_reset,
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NULL, NULL, NULL
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};
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/* Service routines to handle simulator functions */
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/* service routine - actually gets char & places in buffer */
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t_stat sio_svc (UNIT *uptr)
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{
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int32 temp;
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sim_activate (&sio_unit, sio_unit.wait); /* continue poll */
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if ((temp = sim_poll_kbd ()) < SCPE_KFLAG)
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return temp; /* no char or error? */
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sio_unit.buf = temp & 0377; /* Save char */
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sio_unit.u3 |= 0x01; /* Set status */
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/* Do any special character handling here */
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sio_unit.pos++;
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return SCPE_OK;
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}
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t_stat ptr_svc (UNIT *uptr)
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{
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return SCPE_OK;
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}
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t_stat ptp_svc (UNIT *uptr)
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{
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return SCPE_OK;
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}
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/* Reset routine */
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t_stat sio_reset (DEVICE *dptr)
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{
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sio_unit.buf = 0; /* Data */
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sio_unit.u3 = 0x02; /* Status */
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sim_activate (&sio_unit, sio_unit.wait); /* activate unit */
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return SCPE_OK;
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}
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t_stat ptr_reset (DEVICE *dptr)
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{
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ptr_unit.buf = 0;
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ptr_unit.u3 = 0x02;
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sim_cancel (&ptr_unit); /* deactivate unit */
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return SCPE_OK;
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}
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t_stat ptp_reset (DEVICE *dptr)
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{
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ptp_unit.buf = 0;
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ptp_unit.u3 = 0x02;
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sim_cancel (&ptp_unit); /* deactivate unit */
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return SCPE_OK;
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}
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/* I/O instruction handlers, called from the CPU module when an
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IN or OUT instruction is issued.
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Each function is passed an 'io' flag, where 0 means a read from
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the port, and 1 means a write to the port. On input, the actual
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input is passed as the return value, on output, 'data' is written
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to the device.
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*/
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int32 sio0s(int32 io, int32 data)
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{
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if (io == 0) {
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return (sio_unit.u3);
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} else {
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if (data == 0x03) { /* reset port! */
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sio_unit.u3 = 0x02;
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sio_unit.buf = 0;
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sio_unit.pos = 0;
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}
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return (0);
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}
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}
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int32 sio0d(int32 io, int32 data)
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{
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if (io == 0) {
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sio_unit.u3 = sio_unit.u3 & 0xFE;
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return (sio_unit.buf);
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} else {
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sim_putchar(data);
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}
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return 0;
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}
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/* Port 2 controls the PTR/PTP devices */
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int32 sio1s(int32 io, int32 data)
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{
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if (io == 0) {
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if ((ptr_unit.flags & UNIT_ATT) == 0) /* attached? */
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return 0x02;
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if (ptr_unit.u3 != 0) /* No more data? */
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return 0x02;
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return (0x03); /* ready to read/write */
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} else {
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if (data == 0x03) {
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ptr_unit.u3 = 0;
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ptr_unit.buf = 0;
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ptr_unit.pos = 0;
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ptp_unit.u3 = 0;
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ptp_unit.buf = 0;
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ptp_unit.pos = 0;
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}
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return (0);
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}
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}
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int32 sio1d(int32 io, int32 data)
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{
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int32 temp;
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UNIT *uptr;
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if (io == 0) {
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if ((ptr_unit.flags & UNIT_ATT) == 0) /* attached? */
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return 0;
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if (ptr_unit.u3 != 0)
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return 0;
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uptr = ptr_dev.units;
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if ((temp = getc(uptr -> fileref)) == EOF) { /* end of file? */
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ptr_unit.u3 = 0x01;
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return 0;
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}
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ptr_unit.pos++;
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return (temp & 0xFF);
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} else {
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uptr = ptp_dev.units;
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putc(data, uptr -> fileref);
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ptp_unit.pos++;
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}
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return 0;
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}
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