Notes For V3.1-0

RESTRICTION: The FP15 and XVM features of the PDP-15 are only partially
debugged.  Do NOT enable these features for normal operations.

1. New Features in 3.1-0

1.1 SCP and libraries

- Added simulated Ethernet support for VMS, FreeBSD, Mac OS/X.
- Added status return to tmxr_putc_ln.
- Added sim_putchar_s to handle possible output stalls.

1.2 All DECtapes

- Added "DECtape off reel" error stop.

1.3 All Asynchronous Consoles

- Added support for output congestion stall if using a Telnet connection.

1.4 PDP-1

- Added Type 23 parallel drum support.

1.5 PDP-8

- Added instruction history.
- Added TSC8-75 option support for ETOS.
- Added TD8E DECtape support.

1.6 PDP-18b

- Added instruction history.
- Changed PDP-9, PDP-15 API default to enabled.

1.7 PDP-11

- Added support for 18b only Qbus devices.
- Formalized bus and addressing definitions.
- Added control to enable/disable autoconfiguration.
- Added stub support for second Unibus Ethernet controller.

1.7 Interdata 32b

- Added instruction history.

1.8 Eclipse

- Added floating point support.
- Added programmable interval timer support.

1.9 H316

- Added DMA/DMC support.
- Added fixed head disk support.
- Added moving head disk support.
- Added magtape support.

1.10 IBM 1130 (Brian Knittel)

- Added support for physical card reader, using the Cardread
interface (www.ibm1130.org/sim/downloads).
- Added support for physical printer (flushes output buffer after
each line).

2. Bugs Fixed in 3.1-0

2.1 SCP and libraries

- Fixed numerous bugs in Ethernet library.

2.2 All DECtapes

- Fixed reverse checksum value in 'read all' mode.
- Simplified (and sped up) timing.

2.3 PDP-8

- Fixed bug in RX28 read status (found by Charles Dickman).
- Fixed RX28 double density write.

2.4 PDP-18b

- Fixed autoincrement bug in PDP-4, PDP-7, PDP-9.

2.5 PDP-11/VAX

- Revised RQ MB->LBN conversion for greater accuracy.
- Fixed bug in IO configuration (found by David Hittner).
- Fixed bug with multiple RQ RAUSER drives.
- Fixed bug in second Qbus Ethernet controller interrupts.

2.6 Nova/Eclipse

- Fixed bugs in DKP flag clear, map setup, map usage (Charles Owen).
- Fixed bug in MT, reset completes despite I/O reset (Charles Owen).
- Fixed bug in MT, space operations return word count (Charles Owen).

2.7 IBM 1130 (Brian Knittel)

- Fixed bug in setting carry bit in subtract and subtract double.
- Fixed timing problem in console printer simulation.

2.8 1620

- Fixed bug in branch digit (found by Dave Babcock).

3. New Features in 3.0 vs prior releases

3.1 SCP and Libraries

- Added ASSIGN/DEASSIGN (logical name) commands.
- Changed RESTORE to unconditionally detach files.
- Added E11 and TPC format support to magtape library.
- Fixed bug in SHOW CONNECTIONS.
- Added USE_ADDR64 support.

3.2 All magtapes

- Magtapes support SIMH format, E11 format, and TPC format (read only).
- SET <tape_unit> FORMAT=format sets the specified tape unit's format.
- SHOW <tape_unit> FORMAT displays the specified tape unit's format.
- Tape format can also be set as part of the ATTACH command, using
  the -F switch.

3.3 VAX

- VAX can be compiled without USE_INT64.
- If compiled with USE_INT64 and USE_ADDR64, RQ and TQ controllers support
  files > 2GB.
- VAX ROM has speed control (SET ROM DELAY/NODELAY).

3.4 PDP-1

- Added block loader format support to LOAD.
- Changed BOOT PTR to allow loading of all of the first bank of memory.
- The LOAD command takes an optional argument specifying the memory field
  to be loaded.
- The PTR BOOT command takes its starting memory field from the TA (address
  switch) register.

3.5 PDP-18b Family

- Added PDP-4 EAE support.
- Added PDP-15 FP15 support.
- Added PDP-15 XVM support.
- Added PDP-15 "re-entrancy ECO".
- Added PDP-7, PDP-9, PDP-15 hardware RIM loader support in BOOT PTR.

4. Bugs Fixed in 3.0 vs prior releases

4.1 SCP and Libraries

- Fixed end of file problem in dep, idep.
- Fixed handling of trailing spaces in dep, idep.

4.2 VAX

- Fixed CVTfi bug: integer overflow not set if exponent out of range
- Fixed EMODx bugs:
  o First and second operands reversed
  o Separated fraction received wrong exponent
  o Overflow calculation on separated integer incorrect
  o Fraction not set to zero if exponent out of range
- Fixed interval timer and ROM access to pass power-up self-test even on very
  fast host processors (fixes from Mark Pizzolato).
- Fixed bug in user disk size (found by Chaskiel M Grundman).

4.3 1401

- Fixed mnemonic, instruction lengths, and reverse scan length check bug for MCS.
- Fixed MCE bug, BS off by 1 if zero suppress.
- Fixed chaining bug, D lost if return to SCP.
- Fixed H branch, branch occurs after continue.
- Added check for invalid 8 character MCW, LCA.
- Fixed magtape load-mode end of record response.
- Revised fetch to model hardware more closely.
- Fixed tape read end-of-record handling based on real 1401.
- Added diagnostic read (space forward).

4.4 Nova

- Fixed DSK variable size interaction with restore.
- Fixed bug in DSK set size routine.

4.5 PDP-1

- Fixed DT variable size interaction with restore.
- Updated CPU, line printer, standard devices to detect indefinite I/O wait.
- Fixed incorrect logical, missing activate, break in drum simulator.
- Fixed bugs in instruction decoding, overprinting for line printer.
- Fixed system hang if continue after PTR error.
- Fixed PTR to start/stop on successive rpa instructions.

4.6 PDP-11

- Fixed DT variable size interaction with restore.
- Fixed bug in MMR1 update (found by Tim Stark).
- Added XQ features and fixed bugs:
  o Corrected XQ interrupts on IE state transition (code by Tom Evans).
  o Added XQ interrupt clear on soft reset.
  o Removed XQ interrupt when setting XL or RL (multiple people).
  o Added SET/SHOW XQ STATS.
  o Added SHOW XQ FILTERS.
  o Added ability to split received packet into multiple buffers.
  o Added explicit runt and giant packet processing.
- Fixed bug in user disk size (found by Chaskiel M Grundman).

4.7 PDP-18B

- Fixed DT, RF variable size interaction with restore.
- Fixed MT bug in MTTR.
- Fixed bug in PDP-4 line printer overprinting.
- Fixed bug in PDP-15 memory protect/skip interaction.
- Fixed bug in RF set size routine.
- Increased PTP TIME for PDP-15 operating systems.
- Fixed priorities in PDP-15 API (differs from PDP-9).
- Fixed sign handling in PDP-15 EAE unsigned mul/div (differs from PDP-9).
- Fixed bug in CAF, clears API subsystem.

4.8 PDP-8

- Fixed DT, DF, RF, RX variable size interaction with restore.
- Fixed MT bug in SKTR.
- Fixed bug in DF, RF set size routine.

4.9 HP2100

- Fixed bug in DP (13210A controller only), DQ read status.
- Fixed bug in DP, DQ seek complete.
- Fixed DR drum sizes.
- Fixed DR variable capacity interaction with SAVE/RESTORE.

4.10 GRI

- Fixed bug in SC queue pointer management.

4.11 PDP-10

- Fixed bug in RP read header.

4.12 Ibm1130

- Fixed bugs found by APL 1130.

4.13 Altairz80

- Fixed bug in real-time clock on Windows host.

4.14 1620

- Fixed bug in immediate index add (found by Michael Short).

SDS/sds_drm.c

@@ -179,6 +179,7 @@ t_stat drm_svc (UNIT *uptr)
 {
 int32 t, rda;
 uint32 dpc, dwd;
+uint32 *fbuf = uptr->filebuf;
 
 if (drm_sta != DRM_SXFR) {				/* fetch drum prog? */
     dpc = M[DRM_PC];					/* get drum PC */
@@ -225,10 +226,10 @@ else {							/* transfer word */
 	CRETIOE (drm_stopioe, SCPE_UNATT);  }
     if (drm_rw) {					/* write? */
 	dwd = M[drm_ca];				/* get mem word */
-	*(((uint32 *) uptr->filebuf) + drm_da) = dwd;	/* write to drum */
+	fbuf[drm_da] = dwd;				/* write to drum */
 	if (drm_da >= uptr->hwmark) uptr->hwmark = drm_da + 1;  }
     else {						/* read */
-	dwd = *(((uint32 *) uptr->filebuf) + drm_da);	/* get drum word */
+	dwd = fbuf[drm_da];				/* get drum word */
 	M[drm_ca] = dwd;  }				/* write to mem */
     drm_da = drm_da + 1;				/* inc drum addr */
     if (drm_da >= DRM_SIZE) drm_da = 0;			/* wrap */
@@ -243,7 +244,7 @@ else {							/* transfer word */
     else {						/* end xfr */
 #if defined (DRM_PAR)
 	if ((drm_da & DRM_M_WD) && drm_rw) {		/* wr end mid sector? */
-	    *(((uint32 *) uptr->filebuf) + drm_da) = drm_par << 12;
+	    M[drm_da] = drm_par << 12;			/* clobber data */
 	    if (drm_da >= uptr->hwmark) uptr->hwmark = drm_da + 1;  }
 #endif
 	drm_sta = DRM_SFET;				/* back to fetch */

SDS/sds_rad.c

@@ -122,8 +122,8 @@ DEVICE rad_dev = {
 t_stat rad (uint32 fnc, uint32 inst, uint32 *dat)
 {
 int32 t, lun, new_ch;
-uint32 *wptr;
 uint32 p;
+uint32 *fbuf = rad_unit.filebuf;
 
 switch (fnc) {						/* case function */
 case IO_CONN:						/* connect */
@@ -181,9 +181,8 @@ case IO_READ:						/* read */
     if (p >= rad_unit.capac) {				/* end of disk? */
 	rad_end_op (CHF_ERR | CHF_EOR);			/* set rad err */
 	return SCPE_OK;  }
-    wptr = ((uint32 *) rad_unit.filebuf) + p;		/* ptr to word */
-    if (rad_sba & 1) *dat = *wptr & 07777;		/* odd byte? */
-    else *dat = (*wptr >> 12) & 07777;			/* even */
+    if (rad_sba & 1) *dat = fbuf[p] & 07777;		/* odd byte? */
+    else *dat = (fbuf[p] >> 12) & 07777;		/* even */
     rad_sba = rad_adjda (rad_sba, 1);			/* next byte */
     break;
 
@@ -197,9 +196,8 @@ case IO_WRITE:
 	(rad_wrp & (1 << RAD_GETLUN (rad_da)))) {	/* write prot? */
 	rad_end_op (CHF_ERR | CHF_EOR);			/* set rad err */
 	return SCPE_OK;  }
-    wptr = ((uint32 *) rad_unit.filebuf) + p;		/* ptr to word */
-    if (rad_sba & 1) *wptr = *wptr | (*dat & 07777);	/* odd byte? */
-    else *wptr = (*dat & 07777) << 12;			/* even */
+    if (rad_sba & 1) fbuf[p] = fbuf[p] | (*dat & 07777);	/* odd byte? */
+    else fbuf[p] = (*dat & 07777) << 12;		/* even */
     if (p >= rad_unit.hwmark) rad_unit.hwmark = p + 1;	/* mark hiwater */
     rad_sba = rad_adjda (rad_sba, 1);			/* next byte */
     break;
@@ -239,11 +237,11 @@ return SCPE_OK;
 t_stat rad_fill (int32 sba)
 {
 uint32 p = rad_da * RAD_NUMWD;
+uint32 *fbuf = rad_unit.filebuf;
 int32 wa = (sba + 1) >> 1;				/* whole words */
 
 if (sba && (p < rad_unit.capac)) {			/* fill needed? */
-    for ( ; wa < RAD_NUMWD; wa++)
-	*(((uint32 *) rad_unit.filebuf) + p + wa) = 0;
+    for ( ; wa < RAD_NUMWD; wa++) fbuf[p + wa] = 0;
     if ((p + wa) >= rad_unit.hwmark) rad_unit.hwmark = p + wa + 1;
     rad_adjda (sba, RAD_NUMWD - 1);  }			/* inc da */
 return SCPE_OK;

SDS/sds_stddev.c

@@ -28,6 +28,7 @@
    tti		keyboard
    tto		teleprinter
 
+   29-Dec-03	RMS	Added console backpressure support
    25-Apr-03	RMS	Revised for extended file support
 */
 
@@ -468,7 +469,7 @@ tti_unit.pos = tti_unit.pos + 1;
 if (ascii_to_sds[temp] >= 0) {
     tti_unit.buf = ascii_to_sds[temp];			/* internal rep */
     sim_putchar (temp);					/* echo */
-    if (temp == 015) sim_putchar (012);			/* lf after cr */
+    if (temp == '\r') sim_putchar ('\n');		/* lf after cr */
     xfr_req = xfr_req | XFR_TTI;  }			/* set xfr flag */
 else sim_putchar (007);					/* ding! */
 return SCPE_OK;
@@ -499,7 +500,7 @@ return SCPE_OK;
 
 t_stat tto (uint32 fnc, uint32 inst, uint32 *dat)
 {
-int32 asc, new_ch;
+int32 new_ch;
 
 switch (fnc) {						/* case function */
 case IO_CONN:
@@ -517,16 +518,8 @@ case IO_DISC:						/* disconnect */
 case IO_WRITE:						/* write */
     xfr_req = xfr_req & ~XFR_TTO;			/* clr xfr flag */
     tto_unit.buf = (*dat) & 077;			/* save data */
-    if (tto_unit.buf == TT_CR) {			/* control chars? */
-	sim_putchar (015);				/* CR generates LF */
-	tto_unit.pos = tto_unit.pos + 1;
-	asc = 012;  }
-    else if (tto_unit.buf == TT_BS) asc = '\b';
-    else if (tto_unit.buf == TT_TB) asc = '\t';
-    else asc = sds_to_ascii[tto_unit.buf];		/* translate */
-    tto_unit.pos = tto_unit.pos + 1;			/* inc position */
     sim_activate (&tto_unit, tto_unit.wait);		/* activate */
-    return sim_putchar (asc);				/* output */
+    break;
 
 case IO_WREOR:						/* write eor */
     break;
@@ -541,7 +534,21 @@ return SCPE_OK;
 
 t_stat tto_svc (UNIT *uptr)
 {
+int32 asc;
+t_stat r;
+
+if (uptr->buf == TT_CR) asc = '\r';			/* control chars? */
+else if (uptr->buf == TT_BS) asc = '\b';
+else if (uptr->buf == TT_TB) asc = '\t';
+else asc = sds_to_ascii[uptr->buf];			/* translate */
+if ((r = sim_putchar_s (asc)) != SCPE_OK) {		/* output; error? */
+    sim_activate (uptr, uptr->wait);			/* retry */
+    return ((r == SCPE_STALL)? SCPE_OK: r);  }		/* !stall? report */
+uptr->pos = uptr->pos + 1;				/* inc position */
 chan_set_ordy (tto_dib.chan);				/* tto rdy */
+if (asc == '\r') {					/* CR? */
+    sim_putchar ('\n');					/* add lf */
+    uptr->pos = uptr->pos + 1;  }			/* inc position */
 return SCPE_OK;
 }