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simh-testsetgenerator/PDP18B/pdp18b_mt.c
Bob Supnik 701f0fe028 Notes For V2.8 
1. New Features

1.1 Directory and documentation

- Only common files (SCP and libraries) are in the top level
  directory.  Individual simulator files are in their individual
  directories.
- simh_doc.txt has been split up.  simh_doc.txt now documents
  only SCP.  The individual simulators are documented in separate
  text files in their own directories.
- mingw_build.bat is a batch file for the MINGW/gcc environment
  that will build all the simulators, assuming the root directory
  structure is at c:\sim.
- Makefile is a UNIX make file for the gcc environment that will
  build all the simulators, assuming the root directory is at
  c:\sim.

1.2 SCP

- DO <file name> executes the SCP commands in the specified file.
- Replicated registers in unit structures can now be declared as
  arrays for examine, modify, save, and restore.  Most replicated
  unit registers (for example, mag tape position registers) have
  been changed to arrays.
- The ADD/REMOVE commands have been replaced by SET unit ONLINE
  and SET unit OFFLINE, respectively.
- Register names that are unique within an entire simulator do
  not have to be prefaced with the device name.
- The ATTACH command can attach files read only, either under
  user option (-r), or because the attached file is ready only.
- The SET/SHOW capabilities have been extended.  New forms include:

	SET <dev> param{=value}{ param ...}
	SET <unit> param{=value}{ param ...}
	SHOW <dev> {param param ...}
	SHOW <unit> {param param ...}

- Multiple breakpoints have been implemented.  Breakpoints are
  set/cleared/displayed by:

	BREAK addr_list{[count]}
	NOBREAK addr_list
	SHOW BREAK addr_list

1.3 PDP-11 simulator

- Unibus map implemented, with 22b RP controller (URH70) or 18b
  RP controller (URH11) (in debug).
- All DMA peripherals rewritten to use map.
- Many peripherals modified for source sharing with VAX.
- RQDX3 implemented.
- Bugs fixed in RK11 and RL11 write check.

1.4 PDP-10 simulator

- ITS 1-proceed implemented.
- Bugs fixed in ITS PC sampling and LPMR

1.5 18b PDP simulator

- Interrupts split out to multiple levels to allow easier
  expansion.

1.5 IBM System 3 Simulator

- Written by Charles (Dutch) Owen.

1.6 VAX Simulator (in debug)

- Simulates MicroVAX 3800 (KA655) with 16MB-64MB memory, RQDX3,
  RLV12, TSV11, DZV11, LPV11, PCV11.
- CDROM capability has been added to the RQDX3, to allow testing
  with VMS hobbyist images.

1.7 SDS 940 Simulator (not tested)

- Simulates SDS 940, 16K-64K memory, fixed and moving head
  disk, magtape, line printer, console.

1.8 Altair Z80

- Revised from Charles (Dutch) Owen's original by Peter Schorn.
- MITS 8080 with full Z80 simulation.
- 4K and 8K BASIC packages, Prolog package.

1.9 Interdata

The I4 simulator has been withdrawn for major rework.  Look for
a complete 16b/32b Interdata simulator sometime next year.

2. Release Notes

2.1 SCP

SCP now allows replicated registers in unit structures to be
modelled as arrays.  All replicated register declarations have
been replaced by register array declarations.  As a result,
save files from prior revisions will generate errors after
restoring main memory.

2.2 PDP-11

The Unibus map code is in debug.  The map was implemented primarily
to allow source sharing with the VAX, which requires a DMA map.
DMA devices work correctly with the Unibus map disabled.

The RQDX3 simulator has run a complete RSTS/E SYSGEN, with multiple
drives, and booted the completed system from scratch.

2.3 VAX

The VAX simulator will run the boot code up to the >>> prompt.  It
can successfully process a SHOW DEVICE command.  It runs the HCORE
instruction diagnostic.  It can boot the hobbyist CD through SYSBOOT
and through the date/time dialog and restore the hobbyist CD, using
standalone backup.  On the boot of the restored disk, it gets to the
date/time dialog, and then crashes.

2.4 SDS 940

The SDS 940 is untested, awaiting real code.

2.5 GCC Optimization

At -O2 and above, GCC does not correctly compile the simulators which
use setjmp-longjmp (PDP-11, PDP-10, VAX).  A working hypothesis is
that optimized state maintained in registers is being used in the
setjmp processing routine.  On the PDP-11 and PDP-10, all of this
state has been either made global, or volatile, to encourage GCC to
keep the state up to date in memory.  The VAX is still vulnerable.

3. Work list

3.1 SCP

- Better ENABLE/DISABLE.

3.2 PDP-11 RQDX3

Software mapped mode, RCT read simulation, VMS debug.
2011-04-15 08:33:38 -07:00

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/* pdp18b_mt.c: 18b PDP magnetic tape simulator
Copyright (c) 1993-2001, Robert M Supnik
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
ROBERT M SUPNIK 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.
Except as contained in this notice, the name of Robert M Supnik shall not
be used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from Robert M Supnik.
mt (PDP-9) TC59 magtape
(PDP-15) TC59D magtape
29-Nov-01 RMS Added read only unit support
25-Nov-01 RMS Revised interrupt structure
Changed UST, POS, FLG to arrays
26-Apr-01 RMS Added device enable/disable support
15-Feb-01 RMS Fixed 3-cycle data break sequence
04-Oct-98 RMS V2.4 magtape format
22-Jan-97 RMS V2.3 magtape format
29-Jun-96 RMS Added unit enable/disable support
Magnetic tapes are represented as a series of variable records
of the form:
32b byte count
byte 0
byte 1
:
byte n-2
byte n-1
32 byte count
If the byte count is odd, the record is padded with an extra byte
of junk. File marks are represented by a byte count of 0.
*/
#include "pdp18b_defs.h"
#define MT_NUMDR 8 /* #drives */
#define UNIT_V_WLK (UNIT_V_UF + 0) /* write locked */
#define UNIT_WLK 1 << UNIT_V_WLK
#define UNIT_W_UF 2 /* saved flag width */
#define USTAT u3 /* unit status */
#define UNUM u4 /* unit number */
#define DBSIZE (1 << 12) /* max data record */
#define DBMASK (DBSIZE - 1)
#define MT_WC 032 /* word count */
#define MT_CA 033 /* current addr */
#define UNIT_WPRT (UNIT_WLK | UNIT_RO) /* write protect */
/* Command/unit - mt_cu */
#define CU_V_UNIT 15 /* unit */
#define CU_M_UNIT 07
#define CU_PARITY 0040000 /* parity select */
#define CU_DUMP 0020000 /* dump mode */
#define CU_ERASE 0010000 /* ext rec gap */
#define CU_V_CMD 9 /* command */
#define CU_M_CMD 07
#define FN_NOP 00
#define FN_REWIND 01
#define FN_READ 02
#define FN_CMPARE 03
#define FN_WRITE 04
#define FN_WREOF 05
#define FN_SPACEF 06
#define FN_SPACER 07
#define CU_IE 0000400 /* interrupt enable */
#define CU_V_TYPE 6 /* drive type */
#define CU_M_TYPE 03
#define TY_9TK 3
#define GET_UNIT(x) (((x) >> CU_V_UNIT) & CU_M_UNIT)
#define GET_CMD(x) (((x) >> CU_V_CMD) & CU_M_CMD)
#define GET_TYPE(x) (((x) >> CU_V_TYPE) & CU_M_TYPE)
#define PACKED(x) (((x) & CU_DUMP) || (GET_TYPE (x) != TY_9TK))
/* Status - stored in mt_sta or (*) uptr -> USTAT */
#define STA_ERR 0400000 /* error */
#define STA_REW 0200000 /* *rewinding */
#define STA_BOT 0100000 /* *start of tape */
#define STA_ILL 0040000 /* illegal cmd */
#define STA_PAR 0020000 /* parity error */
#define STA_EOF 0010000 /* *end of file */
#define STA_EOT 0004000 /* *end of tape */
#define STA_CPE 0002000 /* compare error */
#define STA_RLE 0001000 /* rec lnt error */
#define STA_DLT 0000400 /* data late */
#define STA_BAD 0000200 /* bad tape */
#define STA_DON 0000100 /* done */
#define STA_CLR 0000077 /* always clear */
#define STA_DYN (STA_REW | STA_BOT | STA_EOF | STA_EOT)
/* kept in USTAT */
#define STA_EFLGS (STA_BOT | STA_ILL | STA_PAR | STA_EOF | \
STA_EOT | STA_CPE | STA_RLE | STA_DLT | STA_BAD)
/* error flags */
extern int32 M[];
extern int32 int_hwre[API_HLVL+1], dev_enb;
extern UNIT cpu_unit;
int32 mt_cu = 0; /* command/unit */
int32 mt_sta = 0; /* status register */
int32 mt_time = 10; /* record latency */
int32 mt_stopioe = 1; /* stop on error */
t_stat mt_svc (UNIT *uptr);
t_stat mt_reset (DEVICE *dptr);
t_stat mt_attach (UNIT *uptr, char *cptr);
t_stat mt_detach (UNIT *uptr);
int32 mt_updcsta (UNIT *uptr, int32 val);
UNIT *mt_busy (void);
/* MT data structures
mt_dev MT device descriptor
mt_unit MT unit list
mt_reg MT register list
mt_mod MT modifier list
*/
UNIT mt_unit[] = {
{ UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) },
{ UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) },
{ UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) },
{ UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) },
{ UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) },
{ UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) },
{ UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) },
{ UDATA (&mt_svc, UNIT_ATTABLE+UNIT_DISABLE+UNIT_ROABLE, 0) } };
REG mt_reg[] = {
{ ORDATA (STA, mt_sta, 18) },
{ ORDATA (CMD, mt_cu, 18) },
{ ORDATA (WC, M[MT_WC], 18) },
{ ORDATA (CA, M[MT_CA], 18) },
{ FLDATA (INT, int_hwre[API_MTA], INT_V_MTA) },
{ FLDATA (STOP_IOE, mt_stopioe, 0) },
{ DRDATA (TIME, mt_time, 24), PV_LEFT },
{ URDATA (UST, mt_unit[0].USTAT, 8, 16, 0, MT_NUMDR, 0) },
{ URDATA (POS, mt_unit[0].pos, 10, 31, 0,
MT_NUMDR, PV_LEFT | REG_RO) },
{ URDATA (FLG, mt_unit[0].flags, 8, UNIT_W_UF, UNIT_V_UF - 1,
MT_NUMDR, REG_HRO) },
{ FLDATA (*DEVENB, dev_enb, INT_V_MTA), REG_HRO },
{ NULL } };
MTAB mt_mod[] = {
{ UNIT_WLK, 0, "write enabled", "ENABLED", NULL },
{ UNIT_WLK, UNIT_WLK, "write locked", "LOCKED", NULL },
{ 0 } };
DEVICE mt_dev = {
"MT", mt_unit, mt_reg, mt_mod,
MT_NUMDR, 10, 31, 1, 8, 8,
NULL, NULL, &mt_reset,
NULL, &mt_attach, &mt_detach };
/* IOT routine */
int32 mt (int32 pulse, int32 AC)
{
int32 f;
UNIT *uptr;
uptr = mt_dev.units + GET_UNIT (mt_cu); /* get unit */
mt_updcsta (uptr, 0); /* update status */
if (pulse == 001) /* MTTR */
return (!sim_is_active (uptr))? IOT_SKP + AC: AC;
if (pulse == 021) /* MTCR */
return (!mt_busy ())? IOT_SKP + AC: AC;
if (pulse == 041) /* MTSF */
return (mt_sta & (STA_ERR | STA_DON))? IOT_SKP + AC: AC;
if (pulse == 002) return (mt_cu & 0777700); /* MTRC */
if (pulse == 042) return mt_sta; /* MTRS */
if ((pulse & 062) == 022) { /* MTAF, MTLC */
if (!mt_busy ()) mt_cu = mt_sta = 0; /* if not busy, clr */
mt_sta = mt_sta & ~(STA_ERR | STA_DON); } /* clear flags */
if ((pulse & 064) == 024) /* MTCM, MTLC */
mt_cu = (mt_cu & 0770700) | (AC & 0777700); /* load status */
if (pulse == 004) { /* MTGO */
f = GET_CMD (mt_cu); /* get function */
if (mt_busy () || (sim_is_active (uptr)) ||
(((f == FN_SPACER) || (f == FN_REWIND)) & (uptr -> pos == 0)) ||
(((f == FN_WRITE) || (f == FN_WREOF)) && (uptr -> flags & UNIT_WPRT))
|| ((uptr -> flags & UNIT_ATT) == 0) || (f == FN_NOP))
mt_sta = mt_sta | STA_ILL; /* illegal op flag */
else { if (f == FN_REWIND) uptr -> USTAT = STA_REW; /* rewind? */
else mt_sta = uptr -> USTAT = 0; /* no, clear status */
sim_activate (uptr, mt_time); } } /* start io */
mt_updcsta (mt_dev.units + GET_UNIT (mt_cu), 0); /* update status */
return AC;
}
/* Unit service
If rewind done, reposition to start of tape, set status
else, do operation, set done, interrupt
*/
t_stat mt_svc (UNIT *uptr)
{
int32 c, c1, c2, c3, f, i, p, u, err;
int32 wc, xma;
t_stat rval;
t_mtrlnt tbc, cbc;
static uint8 dbuf[(3 * DBSIZE)];
static t_mtrlnt bceof = { 0 };
u = uptr -> UNUM; /* get unit number */
if (uptr -> USTAT & STA_REW) { /* rewind? */
uptr -> pos = 0; /* update position */
if (uptr -> flags & UNIT_ATT) uptr -> USTAT = STA_BOT;
else uptr -> USTAT = 0;
if (u == GET_UNIT (mt_cu)) mt_updcsta (uptr, STA_DON);
return SCPE_OK; }
f = GET_CMD (mt_cu); /* get command */
if ((uptr -> flags & UNIT_ATT) == 0) { /* if not attached */
mt_updcsta (uptr, STA_ILL); /* illegal operation */
return IORETURN (mt_stopioe, SCPE_UNATT); }
if ((f == FN_WRITE) || (f == FN_WREOF)) { /* write? */
if (uptr -> flags & UNIT_WPRT) { /* write locked? */
mt_updcsta (uptr, STA_ILL); /* illegal operation */
return SCPE_OK; }
mt_cu = mt_cu & ~CU_ERASE; } /* clear erase flag */
err = 0;
rval = SCPE_OK;
switch (f) { /* case on function */
/* Unit service, continued */
case FN_READ: /* read */
case FN_CMPARE: /* read/compare */
fseek (uptr -> fileref, uptr -> pos, SEEK_SET);
fxread (&tbc, sizeof (t_mtrlnt), 1, uptr -> fileref);
if ((err = ferror (uptr -> fileref)) || /* error or eof? */
(feof (uptr -> fileref))) {
uptr -> USTAT = STA_EOT;
mt_updcsta (uptr, STA_RLE);
break; }
if (tbc == 0) { /* tape mark? */
uptr -> USTAT = STA_EOF;
mt_updcsta (uptr, STA_RLE);
uptr -> pos = uptr -> pos + sizeof (t_mtrlnt);
break; }
tbc = MTRL (tbc); /* ignore error flag */
wc = DBSIZE - (M[MT_WC] & DBMASK); /* get word count */
cbc = PACKED (mt_cu)? wc * 3: wc * 2; /* expected bc */
if (tbc != cbc) mt_sta = mt_sta | STA_RLE; /* wrong size? */
if (tbc < cbc) { /* record small? */
cbc = tbc; /* use smaller */
wc = PACKED (mt_cu)? ((tbc + 2) / 3): ((tbc + 1) / 2); }
i = fxread (dbuf, sizeof (int8), cbc, uptr -> fileref);
for ( ; i < cbc; i++) dbuf[i] = 0; /* fill with 0's */
err = ferror (uptr -> fileref);
for (i = p = 0; i < wc; i++) { /* copy buffer */
M[MT_WC] = (M[MT_WC] + 1) & 0777777; /* inc WC, CA */
M[MT_CA] = (M[MT_CA] + 1) & 0777777;
xma = M[MT_CA] & ADDRMASK;
if (PACKED (mt_cu)) { /* packed? */
c1 = dbuf[p++] & 077;
c2 = dbuf[p++] & 077;
c3 = dbuf[p++] & 077;
c = (c1 << 12) | (c2 << 6) | c3; }
else { c1 = dbuf[p++];
c2 = dbuf[p++];
c = (c1 << 8) | c2; }
if ((f == FN_READ) && MEM_ADDR_OK (xma)) M[xma] = c;
else if ((f == FN_CMPARE) && (c != (M[xma] &
(PACKED (mt_cu)? 0777777: 0177777)))) {
mt_updcsta (uptr, STA_CPE);
break; } }
uptr -> pos = uptr -> pos + ((tbc + 1) & ~1) +
(2 * sizeof (t_mtrlnt));
break;
case FN_WRITE: /* write */
fseek (uptr -> fileref, uptr -> pos, SEEK_SET);
wc = DBSIZE - (M[MT_WC] & DBMASK); /* get word count */
tbc = PACKED (mt_cu)? wc * 3: wc * 2;
fxwrite (&tbc, sizeof (t_mtrlnt), 1, uptr -> fileref);
for (i = p = 0; i < wc; i++) { /* copy buf to tape */
M[MT_WC] = (M[MT_WC] + 1) & 0777777; /* inc WC, CA */
M[MT_CA] = (M[MT_CA] + 1) & 0777777;
xma = M[MT_CA] & ADDRMASK;
if (PACKED (mt_cu)) { /* packed? */
dbuf[p++] = (M[xma] >> 12) & 077;
dbuf[p++] = (M[xma] >> 6) & 077;
dbuf[p++] = M[xma] & 077; }
else { dbuf[p++] = (M[xma] >> 8) & 0377;
dbuf[p++] = M[xma] & 0377; } }
fxwrite (dbuf, sizeof (char), (tbc + 1) & ~1, uptr -> fileref);
fxwrite (&tbc, sizeof (t_mtrlnt), 1, uptr -> fileref);
err = ferror (uptr -> fileref);
uptr -> pos = uptr -> pos + ((tbc + 1) & ~1) +
(2 * sizeof (t_mtrlnt));
break;
/* Unit service, continued */
case FN_WREOF:
fseek (uptr -> fileref, uptr -> pos, SEEK_SET);
fxwrite (&bceof, sizeof (t_mtrlnt), 1, uptr -> fileref);
err = ferror (uptr -> fileref);
uptr -> pos = uptr -> pos + sizeof (t_mtrlnt);
uptr -> USTAT = STA_EOF;
break;
case FN_SPACEF: /* space forward */
do { fseek (uptr -> fileref, uptr -> pos, SEEK_SET);
fxread (&tbc, sizeof (t_mtrlnt), 1, uptr -> fileref); /* read bc */
if ((err = ferror (uptr -> fileref)) || /* error or eof? */
feof (uptr -> fileref)) {
uptr -> USTAT = STA_EOT;
break; }
if (tbc == 0) { /* zero bc? */
uptr -> USTAT = STA_EOF;
uptr -> pos = uptr -> pos + sizeof (t_mtrlnt);
break; }
uptr -> pos = uptr -> pos + ((MTRL (tbc) + 1) & ~1) +
(2 * sizeof (t_mtrlnt)); }
while ((M[MT_WC] = (M[MT_WC] + 1) & 0777777) != 0);
break;
case FN_SPACER: /* space reverse */
if (uptr -> pos == 0) { /* at BOT? */
uptr -> USTAT = STA_BOT;
break; }
do { fseek (uptr -> fileref, uptr -> pos - sizeof (t_mtrlnt),
SEEK_SET);
fxread (&tbc, sizeof (t_mtrlnt), 1, uptr -> fileref);
tbc = MTRL (tbc); /* ignore error flag */
if ((err = ferror (uptr -> fileref)) || /* error or eof? */
feof (uptr -> fileref)) {
uptr -> USTAT = STA_BOT;
uptr -> pos = 0;
break; }
if (tbc == 0) { /* end of file? */
uptr -> USTAT = STA_EOF;
uptr -> pos = uptr -> pos - sizeof (t_mtrlnt);
break; }
uptr -> pos = uptr -> pos - ((tbc + 1) & ~1) -
(2 * sizeof (t_mtrlnt));
if (uptr -> pos == 0) { /* at BOT? */
uptr -> USTAT = STA_BOT;
break; } }
while ((M[MT_WC] = (M[MT_WC] + 1) & 0777777) != 0);
break; } /* end case */
/* Unit service, continued */
if (err != 0) { /* I/O error */
mt_updcsta (uptr, STA_PAR); /* flag error */
perror ("MT I/O error");
rval = SCPE_IOERR;
clearerr (uptr -> fileref); }
mt_updcsta (uptr, STA_DON); /* set done */
return IORETURN (mt_stopioe, rval);
}
/* Update controller status */
int32 mt_updcsta (UNIT *uptr, int32 new)
{
mt_sta = (mt_sta & ~(STA_DYN | STA_ERR | STA_CLR)) |
(uptr -> USTAT & STA_DYN) | new;
if (mt_sta & STA_EFLGS) mt_sta = mt_sta | STA_ERR; /* error flag */
if ((mt_sta & (STA_ERR | STA_DON)) && ((mt_cu & CU_IE) == 0))
SET_INT (MTA);
else CLR_INT (MTA); /* int request */
return mt_sta;
}
/* Test if controller busy */
UNIT *mt_busy (void)
{
int32 u;
UNIT *uptr;
for (u = 0; u < MT_NUMDR; u++) { /* loop thru units */
uptr = mt_dev.units + u;
if (sim_is_active (uptr) && ((uptr -> USTAT & STA_REW) == 0))
return uptr; }
return NULL;
}
/* Reset routine */
t_stat mt_reset (DEVICE *dptr)
{
int32 u;
UNIT *uptr;
mt_cu = mt_sta = 0;
for (u = 0; u < MT_NUMDR; u++) { /* loop thru units */
uptr = mt_dev.units + u;
uptr -> UNUM = u; /* init drive number */
sim_cancel (uptr); /* cancel activity */
if (uptr -> flags & UNIT_ATT) uptr -> USTAT = STA_BOT;
else uptr -> USTAT = 0; }
mt_updcsta (&mt_unit[0], 0); /* update status */
return SCPE_OK;
}
/* IORS routine */
int32 mt_iors (void)
{
return (mt_sta & (STA_ERR | STA_DON))? IOS_MTA: 0;
}
/* Attach routine */
t_stat mt_attach (UNIT *uptr, char *cptr)
{
t_stat r;
r = attach_unit (uptr, cptr);
if (r != SCPE_OK) return r;
uptr -> USTAT = STA_BOT;
mt_updcsta (mt_dev.units + GET_UNIT (mt_cu), 0); /* update status */
return r;
}
/* Detach routine */
t_stat mt_detach (UNIT* uptr)
{
if (!sim_is_active (uptr)) uptr -> USTAT = 0;
mt_updcsta (mt_dev.units + GET_UNIT (mt_cu), 0); /* update status */
return detach_unit (uptr);
}
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