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484 lines
13 KiB
C
484 lines
13 KiB
C
/* emdev.h, Jim Wilcoxson, April 17, 2005
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Device handlers for pio instructions. Use devnull as a template for
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new handlers.
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NOTES:
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OCP instructions never skip
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SKS instructions skip on specified conditions
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INA/OTA instructions skip if they succeed (data was read/written)
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Device numbers:
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'01 = paper tape reader
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'02 = paper tape punch
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'03 = 1st MPC (line printer/card reader/card punch)
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'04 = SOC board (system console/user terminal)
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'05 = 2nd MPC (line printer/card reader/card punch)
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'06 = card punch? (RTOS User Guide, A-1) / IPC (Engr Handbook p.101)
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'07 = PNC
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'12 = diskette
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'13 = 2nd magtape controller
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'14 = 1st magtape controller
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'20 = control panel / real-time clock
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'21 = 1st 4002 disk controller
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'22 = obsolete: fixed head disk
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'23 = obsolete: 30MB disk
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'24 = tag monitor (tmain.pma) / writable control store
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'25 = obsolete: moving head disk
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'26 = 1st disk controller
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'27 = 2nd disk controller
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'30-32 = BPIOC #1-3 (RTOS User Guide, A-1)
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'33 = 1st Versatec (verdim)
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'34 = 2nd Versatec
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'35 = 4th AMLC
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'36-37 = ELFBUS #1 & 2
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'40 = A/D converter type 6000
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'41 = digital input type 6020
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'42 = digital input #2
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'43 = digital output type 6040
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'44 = digital output #2
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'45 = D/A converter type 6060 (analog output)
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'50 = 1st HSSMLC (cs/slcdim.pma)
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'51 = 2nd HSSMLC
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'52 = 3rd AMLC
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'53 = 2nd AMLC
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'54 = 1st AMLC
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'55 = MACI autocall unit
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'56 = old SMLC (RTOS User Guide, A-1)
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'60-67 = reserved for user devices
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'70-'73 = Megatek graphics terminals
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Devices emulated by Primos in ks/ptrap.ftn:
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'04 = console, '01 = paper tape reader, '02 = paper tape punch,
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'20 = control panel
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*/
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#include <fcntl.h>
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#include <unistd.h>
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void devnull (short class, short func, short device) {
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switch (class) {
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case 0:
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fprintf(stderr," OCP '%02o%02o\n", func, device);
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if (func == 0) {
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;
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} else {
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fprintf(stderr," unimplemented OCP device '%02o function\n", device);
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exit(1);
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}
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break;
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case 1:
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fprintf(stderr," SKS '%02o%02o\n", func, device);
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if (func == 0)
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mem[P]++; /* assume it's always ready */
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else {
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fprintf(stderr," unimplemented SKS device '%02o function\n", device);
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exit(1);
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}
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break;
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case 2:
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fprintf(stderr," INA '%02o%02o\n", func, device);
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if (func == 0) {
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;
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} else {
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fprintf(stderr," unimplemented INA device '%02o function\n", device);
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exit(1);
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}
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break;
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case 3:
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fprintf(stderr," OTA '%02o%02o\n", func, device);
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if (func == 0 | func == 1) {
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mem[P]++; /* OTA '0004 always works on Unix */
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} else {
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fprintf(stderr," unimplemented OTA device '%02o function\n", device);
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exit(1);
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}
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break;
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}
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}
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/* Device '4: system console
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OCP '0004 = initialize for input only, echoplex, 110 baud, 8-bit, no parity
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OCP '0104 = same, but for output only
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OCP '1004 = Full duplex; software must echo
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OCP '1204 = Prime normal, independent xmit and recv w/echoplex
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OCP '1304 = Self test mode (internally connects transmitter to receiver)
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OCP '1704 = same as above, but clears interrupt masks and dma/c enables
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*/
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void devasr (short class, short func, short device) {
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static int ttydev=-1;
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unsigned char ch;
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int ttyflags, newflags;
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int n;
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if (ttydev < 0) {
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ttydev = open("/dev/tty", O_RDWR, 0);
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if (ttydev < 0) {
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perror(" error opening /dev/tty");
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exit(1);
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}
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}
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switch (class) {
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case 0:
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fprintf(stderr," OCP '%02o%02o\n", func, device);
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break;
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case 1:
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fprintf(stderr," SKS '%02o%02o\n", func, device);
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if (func <= 7)
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mem[P]++; /* assume it's always ready */
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else {
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fprintf(stderr," unimplemented SKS '04 function\n");
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exit(1);
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}
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break;
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case 2:
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fprintf(stderr," INA '%02o%02o\n", func, device);
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if (func == 0 || func == 010) {
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if (fcntl(ttydev, F_GETFL, ttyflags) == -1) {
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perror(" unable to get tty flags");
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exit(1);
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}
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if (mem[mem[P]] == 03776) /* JMP *-1 -> blocking read */
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newflags = ttyflags & ~O_NONBLOCK;
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else
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newflags = ttyflags | O_NONBLOCK;
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if (fcntl(ttydev, F_SETFL, newflags) == -1) {
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perror(" unable to set tty flags");
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exit(1);
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}
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n = read(ttydev, &ch, 1);
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if (n < 0) {
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if (errno != EAGAIN) {
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perror(" error reading from tty");
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exit(1);
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}
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} else if (n == 1) {
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if (func >= 010)
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mem[A] = 0;
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mem[A] = mem[A] | ch | 0x80;
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mem[P]++;
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} else if (n != 0) {
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fprintf(stderr," unexpected error reading from tty, n=%d", n);
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exit(1);
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}
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} else if (func == 011) { /* read device id? */
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mem[A] = 4;
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mem[P]++;
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} else if (func == 012) { /* read control word */
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mem[A] = 04110;
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mem[P]++;
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} else {
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fprintf(stderr," unimplemented INA '04 function\n");
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exit(1);
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}
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break;
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case 3:
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fprintf(stderr," OTA '%02o%02o\n", func, device);
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if (func == 0) {
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fprintf(stderr," char to write=%o\n", mem[A]);
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putchar(mem[A] & 0x7f);
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fflush(stdout);
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mem[P]++; /* OTA '0004 always works on Unix */
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} else if (func == 1) { /* write control word */
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mem[P]++;
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} else {
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fprintf(stderr," unimplemented OTA '04 function\n");
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exit(1);
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}
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break;
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}
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}
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/* Device '14 - magtape controller #1
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*/
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void devmt (short class, short func, short device) {
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switch (class) {
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case 0:
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fprintf(stderr," OCP '%02o%02o\n", func, device);
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break;
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case 1:
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fprintf(stderr," SKS '%02o%02o\n", func, device);
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break;
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case 2:
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fprintf(stderr," INA '%02o%02o\n", func, device);
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if (mem[mem[P]] == 03776) { /* JMP *-1 -> blocking read */
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fprintf(stderr," Device not supported, so I/O hangs\n");
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exit(1);
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}
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break;
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case 3:
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fprintf(stderr," OTA '%02o%02o\n", func, device);
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if (mem[mem[P]] == 03776) { /* JMP *-1 -> blocking read */
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fprintf(stderr," Device not supported, so I/O hangs\n");
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exit(1);
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}
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break;
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}
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}
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/* Device '20: control panel switches and lights
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OTA '1720 = write to lights (sets CP fetch address)
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INA '1420 = read location from CP ROM (not implemented, used to boot)
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INA '1620 = read control panel switches
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*/
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void devcp (short class, short func, short device) {
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switch (class) {
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case 0:
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fprintf(stderr," OCP '%02o%02o\n", func, device);
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fprintf(stderr," unimplemented OCP device '%02o function\n", device);
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exit(1);
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break;
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case 1:
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fprintf(stderr," SKS '%02o%02o\n", func, device);
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fprintf(stderr," unimplemented SKS device '%02o function\n", device);
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exit(1);
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break;
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case 2:
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fprintf(stderr," INA '%02o%02o\n", func, device);
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if (func == 016) {
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mem[A] = 014114;
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mem[A] = 0;
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} else {
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fprintf(stderr," unimplemented INA device '%02o function\n", device);
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exit(1);
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}
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break;
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case 3:
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fprintf(stderr," OTA '%02o%02o\n", func, device);
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if (func == 017) { /* write lights */
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mem[P]++;
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} else {
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fprintf(stderr," unimplemented OTA device '%02o function\n", device);
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exit(1);
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}
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break;
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}
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}
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/* disk controller at '26 and '27
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NOTES:
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- in the DSEL disk channel program command, unit number is a 4-bit field,
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with these binary values:
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0001 = unit 0 (pdev 460/461)
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0010 = unit 1 (pdev 462/463)
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0100 = unit 2 (pdev 464/465)
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1000 = unit 3 (pdev 466/467)
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OCP '1626 = reset interrupt
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OCP '1726 = reset controller
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INA '1126 = input ID, don't clear A first, fails if no controller
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INA '1726 = read status (or something), fails if controller busy
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OTA '1726 = load OAR (Order Address Register), ie, run channel
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program, address is in A
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*/
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void devdisk (short class, short func, short device) {
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unsigned short oar;
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unsigned short status; /* actual status */
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unsigned short teststatus; /* status for order testing */
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unsigned short memaddr;
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unsigned short order;
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short halt;
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short unit;
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short head, track, rec, recsize, nwords;
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unsigned short dmachan, dmanch, dmaaddr;
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short dmanw;
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char ordertext[8];
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char devfile[8];
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char devopened[8]; /* device file that is open on devfd */
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static int devfd=-1; /* device file descriptor */
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int theads, spt, phyra;
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switch (class) {
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case 0:
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fprintf(stderr," OCP '%2o%2o\n", func, device);
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break;
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case 1:
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fprintf(stderr," SKS '%2o%2o\n", func, device);
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break;
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case 2:
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fprintf(stderr," INA '%2o%2o\n", func, device);
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if (func == 01) /* read device id, clear A first */
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mem[A] = device;
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else if (func == 011) /* read device id, don't clear A */
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mem[A] |= device;
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else if (func == 017) /* read status */
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mem[A] = 0100000;
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mem[P]++;
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break;
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case 3:
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fprintf(stderr," OTA '%02o%02o\n", func, device);
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if (func == 017) { /* set OAR (order address register) */
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oar = mem[A];
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halt = 0;
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status = 0100000;
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unit = -1;
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while (!halt) {
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order = mem[oar]>>12;
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fprintf(stderr,"\n %o: %o %o %o\n", oar, mem[oar], mem[oar+1], mem[oar+2]);
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if (mem[oar] & 04000) { /* "execute if ..." */
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if (order == 2 || order == 5 || order == 6)
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oar += 3;
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else
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oar += 2;
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continue;
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}
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switch (order) {
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case 0: /* DHLT = Halt */
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halt = 1;
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fprintf(stderr," channel program halt at '%o\n", oar);
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break;
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case 2: /* SFORM = Format */
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case 5: /* SREAD = Read */
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case 6: /* SWRITE = Write */
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recsize = mem[oar] & 017;
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track = mem[oar+1] & 01777;
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rec = mem[oar+2] >> 8; /* # records for format, rec # for R/W */
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head = mem[oar+2] & 077;
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if (order == 2)
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strcpy(ordertext,"Format");
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else if (order == 5)
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strcpy(ordertext,"Read");
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else if (order == 6)
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strcpy(ordertext,"Write");
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fprintf(stderr," %s, head=%d, track=%d, rec=%d, recsize=%d\n", ordertext, head, track, rec, recsize);
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dmanw = mem[dmachan];
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dmanw = -(dmanw>>4);
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dmaaddr = mem[dmachan+1];
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fprintf(stderr, " DMA channels: nch-1=%d, ['%o]='%o, ['%o]='%o, nwords=%d\n", dmanch, dmachan, mem[dmachan], dmachan+1, mem[dmachan+1], dmanw);
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if (devfd == -1) {
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fprintf(stderr," Unit not selected or not ready\n");
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status = 0100001;
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} else if (order == 2)
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fprintf(stderr," Format order not implemented\n");
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else if (order == 5) {
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/* translate head/track/sector to drive record address */
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theads = 40; /* should get total heads from a config file */
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spt = 9; /* and sectors per track too */
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phyra = (track*theads*spt) + head*9 + rec;
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fprintf(stderr, " phyra=%d, byte offset=%d\n", phyra, phyra*2080);
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if (lseek(devfd, phyra*2080, SEEK_SET) == -1) {
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perror("Unable to seek drive file");
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exit(1);
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}
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if (read(devfd, mem+dmaaddr, dmanw*2) != dmanw*2) {
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perror("Unable to read drive file");
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exit(1);
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}
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mem[dmachan] = 0;
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mem[dmachan+1] += dmanw;
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} else if (order == 6)
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fprintf(stderr," Write order not implemented\n");
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oar += 3;
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break;
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case 3: /* SSEEK = Seek */
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track = mem[oar+1] & 01777;
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fprintf(stderr," seek track %d, restore=%d, clear=%d\n", track, (mem[oar+1] & 0100000) != 0, (mem[oar+1] & 040000) != 0);
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oar += 2;
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break;
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case 4: /* DSEL = Select unit */
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unit = (mem[oar+1] & 017) >> 1; /* unit = 0/1/2/4 */
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if (unit == 4) unit = 3; /* unit = 0/1/2/3 */
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snprintf(devfile,sizeof(devfile),"dev%ou%d", device, unit);
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fprintf(stderr," select unit %d, filename %s\n", unit, devfile);
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if (strcmp(devfile,devopened) != 0 || devfd == -1) {
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if (devfd != -1) {
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close(devfd);
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devfd = -1;
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}
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if ((devfd = open(devfile, O_RDONLY, 0)) == -1)
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status = 0100001; /* not ready */
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else
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strcpy(devopened, devfile);
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}
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oar += 2;
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break;
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case 7: /* DSTALL = Stall */
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fprintf(stderr," stall\n");
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oar += 2;
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break;
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case 9: /* DSTAT = Store status to memory */
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memaddr = mem[oar+1];
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fprintf(stderr, " store status to '%o\n", memaddr);
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mem[memaddr] = status;
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oar += 2;
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break;
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case 11: /* DOAR = Store OAR to memory (2 words) */
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memaddr = mem[oar+1];
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fprintf(stderr, " store OAR to '%o\n", memaddr);
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mem[memaddr] = oar;
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oar += 2;
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break;
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case 13: /* SDMA = select DMA channel(s) to use */
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dmanch = mem[oar] & 017;
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dmachan = mem[oar+1];
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fprintf(stderr, " set DMA channels, nch-1=%d, channel='%o\n", dmanch, dmachan);
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oar += 2;
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break;
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case 14: /* DINT = generate interrupt through vector address */
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memaddr = mem[oar+1];
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fprintf(stderr, " interrupt through '%o\n", memaddr);
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exit(1);
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oar += 2;
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break;
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case 15: /* DTRAN = channel program jump */
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oar = mem[oar+1];
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fprintf(stderr, " jump to '%o\n", oar);
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break;
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default:
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fprintf(stderr, " unrecognized channel order = %d\n", order);
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exit(1);
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}
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}
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mem[P]++;
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} else {
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fprintf(stderr," unimplemented OTA device '%02o function\n", device);
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exit(1);
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}
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break;
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}
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}
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