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Notes For V3.7-0

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1. New Features

1.1 3.7-0

1.1.1 SCP

- Added SET THROTTLE and SET NOTHROTTLE commands to regulate simulator
  execution rate and host resource utilization.
- Added idle support (based on work by Mark Pizzolato).
- Added -e to control error processing in nested DO commands (from
  Dave Bryan).

1.1.2 HP2100

- Added Double Integer instructions, 1000-F CPU, and Floating Point
  Processor (from Dave Bryan).
- Added 2114 and 2115 CPUs, 12607B and 12578A DMA controllers, and
  21xx binary loader protection (from Dave Bryan).

1.1.3 Interdata

- Added SET IDLE and SET NOIDLE commands to idle the simulator in wait
  state.

1.1.4 PDP-11

- Added SET IDLE and SET NOIDLE commands to idle the simulator in wait
  state (WAIT instruction executed).
- Added TA11/TU60 cassette support.

1.1.5 PDP-8

- Added SET IDLE and SET NOIDLE commands to idle the simulator in wait
  state (keyboard poll loop or jump-to-self).
- Added TA8E/TU60 cassette support.

1.1.6 PDP-1

- Added support for 16-channel sequence break system.
- Added support for PDP-1D extended features and timesharing clock.
- Added support for Type 630 data communications subsystem.

1.1.6 PDP-4/7/9/15

- Added SET IDLE and SET NOIDLE commands to idle the simulator in wait
  state (keyboard poll loop or jump-to-self).

1.1.7 VAX, VAX780

- Added SET IDLE and SET NOIDLE commands to idle the simulator in wait
  state (more than 200 cycles at IPL's 0, 1, or 3 in kernel mode).

1.1.8 PDP-10

- Added SET IDLE and SET NOIDLE commands to idle the simulator in wait
  state (operating system dependent).
- Added CD20 (CD11) support.

2. Bugs Fixed

Please see the revision history on http://simh.trailing-edge.com or
in the source module sim_rev.h.
This commit is contained in:
Bob Supnik
2007-02-03 14:59:00 -08:00
committed by Mark Pizzolato
parent 15919a2dd7
commit 53d02f7fa7
161 changed files with 18604 additions and 6903 deletions
Download Patch File Download Diff File Expand all files Collapse all files

318
sim_tape.c
View File

@@ -1,6 +1,6 @@
/* sim_tape.c: simulator tape support library
Copyright (c) 1993-2006, Robert M Supnik
Copyright (c) 1993-2007, 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"),
@@ -26,6 +26,10 @@
Ultimately, this will be a place to hide processing of various tape formats,
as well as OS-specific direct hardware access.
23-Jan-07 JDB Fixed backspace over gap at BOT
22-Jan-07 RMS Fixed bug in P7B format read reclnt rev (found by Rich Cornwell)
15-Dec-06 RMS Added support for small capacity tapes
30-Aug-06 JDB Added erase gap support
14-Feb-06 RMS Added variable tape capacity
23-Jan-06 JDB Fixed odd-byte-write problem in sim_tape_wrrecf
17-Dec-05 RMS Added write support for Paul Pierce 7b format
@@ -48,6 +52,7 @@
sim_tape_sprecr space tape record reverse
sim_tape_wrtmk write tape mark
sim_tape_wreom erase remainder of tape
sim_tape_wrgap write erase gap
sim_tape_rewind rewind
sim_tape_reset reset unit
sim_tape_bot TRUE if at beginning of tape
@@ -165,6 +170,8 @@ return SCPE_OK;
end of file/medium unchanged, PNU set
tape mark updated
data record updated, sim_fread will read record forward
See notes at "sim_tape_wrgap" regarding erase gap implementation.
*/
t_stat sim_tape_rdlntf (UNIT *uptr, t_mtrlnt *bc)
@@ -181,20 +188,28 @@ sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* set tape pos */
switch (f) { /* switch on fmt */
case MTUF_F_STD: case MTUF_F_E11:
sim_fread (bc, sizeof (t_mtrlnt), 1, uptr->fileref); /* read rec lnt */
sbc = MTR_L (*bc); /* save rec lnt */
if (ferror (uptr->fileref)) { /* error? */
MT_SET_PNU (uptr); /* pos not upd */
return sim_tape_ioerr (uptr);
do {
sim_fread (bc, sizeof (t_mtrlnt), 1, uptr->fileref); /* read rec lnt */
sbc = MTR_L (*bc); /* save rec lnt */
if (ferror (uptr->fileref)) { /* error? */
MT_SET_PNU (uptr); /* pos not upd */
return sim_tape_ioerr (uptr);
}
if (feof (uptr->fileref) || (*bc == MTR_EOM)) { /* eof or eom? */
MT_SET_PNU (uptr); /* pos not upd */
return MTSE_EOM;
}
uptr->pos = uptr->pos + sizeof (t_mtrlnt); /* spc over rec lnt */
if (*bc == MTR_TMK) return MTSE_TMK; /* tape mark? */
if (*bc == MTR_FHGAP) { /* half gap? */
uptr->pos = uptr->pos + sizeof (t_mtrlnt) / 2; /* half space fwd */
sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* resync */
}
else if (*bc != MTR_GAP)
uptr->pos = uptr->pos + sizeof (t_mtrlnt) + /* spc over record */
((f == MTUF_F_STD)? ((sbc + 1) & ~1): sbc);
}
if (feof (uptr->fileref) || (*bc == MTR_EOM)) { /* eof or eom? */
MT_SET_PNU (uptr); /* pos not upd */
return MTSE_EOM;
}
uptr->pos = uptr->pos + sizeof (t_mtrlnt); /* spc over rec lnt */
if (*bc == MTR_TMK) return MTSE_TMK; /* tape mark? */
uptr->pos = uptr->pos + sizeof (t_mtrlnt) + /* spc over record */
((f == MTUF_F_STD)? ((sbc + 1) & ~1): sbc);
while ((*bc == MTR_GAP) || (*bc == MTR_FHGAP));
break;
case MTUF_F_TPC:
@@ -257,6 +272,8 @@ return MTSE_OK;
end of medium updated
tape mark updated
data record updated, sim_fread will read record forward
See notes at "sim_tape_wrgap" regarding erase gap implementation.
*/
t_stat sim_tape_rdlntr (UNIT *uptr, t_mtrlnt *bc)
@@ -274,18 +291,29 @@ if (sim_tape_bot (uptr)) return MTSE_BOT; /* at BOT? */
switch (f) { /* switch on fmt */
case MTUF_F_STD: case MTUF_F_E11:
sim_fseek (uptr->fileref, uptr->pos - sizeof (t_mtrlnt), SEEK_SET);
sim_fread (bc, sizeof (t_mtrlnt), 1, uptr->fileref); /* read rec lnt */
sbc = MTR_L (*bc);
if (ferror (uptr->fileref)) /* error? */
return sim_tape_ioerr (uptr);
if (feof (uptr->fileref)) return MTSE_EOM; /* eof? */
uptr->pos = uptr->pos - sizeof (t_mtrlnt); /* spc over rec lnt */
if (*bc == MTR_EOM) return MTSE_EOM; /* eom? */
if (*bc == MTR_TMK) return MTSE_TMK; /* tape mark? */
uptr->pos = uptr->pos - sizeof (t_mtrlnt) - /* spc over record */
((f == MTUF_F_STD)? ((sbc + 1) & ~1): sbc);
sim_fseek (uptr->fileref, uptr->pos + sizeof (t_mtrlnt), SEEK_SET);
do {
sim_fseek (uptr->fileref, uptr->pos - sizeof (t_mtrlnt), SEEK_SET);
sim_fread (bc, sizeof (t_mtrlnt), 1, uptr->fileref); /* read rec lnt */
sbc = MTR_L (*bc);
if (ferror (uptr->fileref)) /* error? */
return sim_tape_ioerr (uptr);
if (feof (uptr->fileref)) return MTSE_EOM; /* eof? */
uptr->pos = uptr->pos - sizeof (t_mtrlnt); /* spc over rec lnt */
if (*bc == MTR_EOM) return MTSE_EOM; /* eom? */
if (*bc == MTR_TMK) return MTSE_TMK; /* tape mark? */
if ((*bc & MTR_M_RHGAP) == MTR_RHGAP) { /* half gap? */
uptr->pos = uptr->pos + sizeof (t_mtrlnt) / 2; /* half space rev */
sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* resync */
}
else if (*bc != MTR_GAP) {
uptr->pos = uptr->pos - sizeof (t_mtrlnt) - /* spc over record */
((f == MTUF_F_STD)? ((sbc + 1) & ~1): sbc);
sim_fseek (uptr->fileref, uptr->pos + sizeof (t_mtrlnt), SEEK_SET);
}
else if (sim_tape_bot (uptr)) /* backed into BOT? */
return MTSE_BOT;
}
while ((*bc == MTR_GAP) || (*bc == MTR_RHGAP));
break;
case MTUF_F_TPC:
@@ -312,6 +340,7 @@ switch (f) { /* switch on fmt */
if (c & P7B_SOR) break; /* start of record? */
}
uptr->pos = uptr->pos - sbc; /* update position */
*bc = sbc; /* save rec lnt */
sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* for read */
if (all_eof) return MTSE_TMK; /* tape mark? */
break;
@@ -432,9 +461,10 @@ uint32 f = MT_GET_FMT (uptr);
t_mtrlnt sbc;
MT_CLR_PNU (uptr);
sbc = MTR_L (bc);
if ((uptr->flags & UNIT_ATT) == 0) return MTSE_UNATT; /* not attached? */
if (sim_tape_wrp (uptr)) return MTSE_WRP; /* write prot? */
sbc = MTR_L (bc);
if (sbc == 0) return MTSE_OK; /* nothing to do? */
sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* set pos */
switch (f) { /* case on format */
@@ -502,6 +532,232 @@ if (MT_GET_FMT (uptr) == MTUF_F_P7B) return MTSE_FMT; /* cant do P7B */
return sim_tape_wrdata (uptr, MTR_EOM);
}
/* Write erase gap
Inputs:
uptr = pointer to tape unit
gaplen = length of gap in tenths of an inch
bpi = current recording density in bytes per inch
Outputs:
status = operation status
exit condition position
------------------ ------------------
unit unattached unchanged
unsupported format unchanged
write protected unchanged
read error unchanged, PNU set
write error unchanged, PNU set
gap written updated
An erase gap is represented in the tape image file by a special metadata
value. This value is chosen so that it is still recognizable even if it has
been "cut in half" by a subsequent data overwrite that does not end on a
metadatum-sized boundary. In addition, a range of metadata values are
reserved for detection in the reverse direction. Erase gaps are supported
only in SIMH tape format.
This implementation supports erasing gaps in the middle of a populated tape
image and will always produce a valid image. It also produces valid images
when overwriting gaps with data records, with one exception: a data write
that leaves only two bytes of gap remaining will produce an invalid tape.
This limitation is deemed acceptable, as it is analogous to the existing
limitation that data records cannot overwrite other data records without
producing an invalid tape.
Because SIMH tape images do not carry physical parameters (e.g., recording
density), overwriting a tape image file containing gap metadata is
problematic if the density setting is not the same as that used during
recording. There is no way to establish a gap of a certain length
unequivocally in an image file, so this implementation establishes a gap of a
certain number of bytes that reflect the desired gap length at the bpi used
during writing.
To write an erase gap, the implementation uses one of two approaches,
depending on whether or not the current tape position is at EOM. Erasing at
EOM presents no special difficulties; gap metadata markers are written for
the prescribed number of bytes. If the tape is not at EOM, then erasing must
take into account the existing record structure to ensure that a valid tape
image is maintained.
The general approach is to erase for the nominal number of bytes but to
increase that length, if necessary, to ensure that a partially overwritten
data record at the end of the gap can be altered to maintain validity.
Because the smallest legal tape record requires space for two metadata
markers plus two data bytes, an erasure that would leave less than that
is increased to consume the entire record. Otherwise, the final record is
truncated appropriately.
When reading in either direction, gap metadata markers are ignored (skipped)
until a record length header, EOF marker, EOM marker, or physical EOF is
encountered. Thus, tape images containing gap metadata are transparent to
the calling simulator.
The permissibility of data record lengths that are not multiples of the
metadatum size presents a difficulty when reading. If such an "odd length"
record is written over a gap, half of a metadata marker will exist
immediately after the trailing record length.
This condition is detected when reading forward by the appearance of a
"reversed" marker. The value appears reversed because the value is made up
of half of one marker and half of the next. This is handled by seeking
forward two bytes to resync (the stipulation above that the overwrite cannot
leave only two bytes of gap means that at least one "whole" metadata marker
will follow). Reading in reverse presents a more complex problem, because
half of the marker is from the preceding trailing record length marker and
therefore could be any of a range of values. However, that range is
restricted by the SIMH tape specification requirement that record length
metadata values must have bits 30:24 set to zero. This allows unambiguous
detection of the condition.
The value chosen for gap metadata and the values reserved for "half-gap"
detection are:
0xFFFFFFFE - primary gap value
0xFFFEFFFF - reserved (indicates half-gap in forward reads)
0xFFFF0000:0xFFFF00FF - reserved (indicates half-gap in reverse reads)
0xFFFF8000:0xFFFF80FF - reserved (indicates half-gap in reverse reads)
*/
t_stat sim_tape_wrgap (UNIT *uptr, uint32 gaplen, uint32 bpi)
{
t_stat st;
t_mtrlnt meta, sbc, new_len, rec_size;
t_addr gap_pos = uptr->pos;
uint32 file_size, marker_count;
uint32 format = MT_GET_FMT (uptr);
uint32 gap_alloc = 0; /* gap allocated from tape */
int32 gap_needed = (gaplen * bpi) / 10; /* gap remainder still needed */
const uint32 meta_size = sizeof (t_mtrlnt); /* bytes per metadatum */
const uint32 min_rec_size = 2 + sizeof (t_mtrlnt) * 2; /* smallest data record size */
MT_CLR_PNU (uptr);
if ((uptr->flags & UNIT_ATT) == 0) /* not attached? */
return MTSE_UNATT;
if (format != MTUF_F_STD) /* not SIMH fmt? */
return MTSE_FMT;
if (sim_tape_wrp (uptr)) /* write protected? */
return MTSE_WRP;
file_size = sim_fsize (uptr->fileref); /* get file size */
sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* position tape */
/* Read tape records and allocate to gap until amount required is consumed.
Read next metadatum from tape:
- EOF or EOM: allocate remainder of bytes needed.
- TMK or GAP: allocate sizeof(metadatum) bytes.
- Reverse GAP: allocate sizeof(metadatum) / 2 bytes.
- Data record: see below.
Loop until bytes needed = 0.
*/
do {
sim_fread (&meta, meta_size, 1, uptr->fileref); /* read metadatum */
if (ferror (uptr->fileref)) { /* read error? */
uptr->pos = gap_pos; /* restore original position */
MT_SET_PNU (uptr); /* position not updated */
return sim_tape_ioerr (uptr); /* translate error */
}
else
uptr->pos = uptr->pos + meta_size; /* move tape over datum */
if (feof (uptr->fileref) || (meta == MTR_EOM)) { /* at eof or eom? */
gap_alloc = gap_alloc + gap_needed; /* allocate remainder */
gap_needed = 0;
}
else if ((meta == MTR_GAP) || (meta == MTR_TMK)) { /* gap or tape mark? */
gap_alloc = gap_alloc + meta_size; /* allocate marker space */
gap_needed = gap_needed - meta_size; /* reduce requirement */
}
else if (meta == MTR_FHGAP) { /* half gap? */
uptr->pos = uptr->pos - meta_size / 2; /* backup to resync */
sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* position tape */
gap_alloc = gap_alloc + meta_size / 2; /* allocate marker space */
gap_needed = gap_needed - meta_size / 2; /* reduce requirement */
}
else if (uptr->pos +
MTR_L (meta) + meta_size > file_size) { /* rec len out of range? */
gap_alloc = gap_alloc + gap_needed; /* presume overwritten tape */
gap_needed = 0; /* allocate remainder */
}
/* Allocate a data record:
- Determine record size in bytes (including metadata)
- If record size - bytes needed < smallest allowed record size,
allocate entire record to gap, else allocate needed amount and
truncate data record to reflect remainder.
*/
else { /* data record */
sbc = MTR_L (meta); /* get record data length */
rec_size = ((sbc + 1) & ~1) + meta_size * 2; /* overall size in bytes */
if (rec_size < gap_needed + min_rec_size) { /* rec too small? */
uptr->pos = uptr->pos - meta_size + rec_size; /* position past record */
sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* move tape */
gap_alloc = gap_alloc + rec_size; /* allocate record */
gap_needed = gap_needed - rec_size; /* reduce requirement */
}
else { /* record size OK */
uptr->pos = uptr->pos - meta_size + gap_needed; /* position to end of gap */
new_len = MTR_F (meta) | (sbc - gap_needed); /* truncate to new len */
st = sim_tape_wrdata (uptr, new_len); /* write new rec len */
if (st != MTSE_OK) { /* write OK? */
uptr->pos = gap_pos; /* restore orig pos */
return st; /* PNU was set by wrdata */
}
uptr->pos = uptr->pos + sbc - gap_needed; /* position to end of data */
st = sim_tape_wrdata (uptr, new_len); /* write new rec len */
if (st != MTSE_OK) { /* write OK? */
uptr->pos = gap_pos; /* restore orig pos */
return st; /* PNU was set by wrdata */
}
gap_alloc = gap_alloc + gap_needed; /* allocate remainder */
gap_needed = 0;
}
}
}
while (gap_needed > 0);
uptr->pos = gap_pos; /* reposition to gap start */
if (gap_alloc & (meta_size - 1)) { /* gap size "odd?" */
st = sim_tape_wrdata (uptr, MTR_FHGAP); /* write half gap marker */
if (st != MTSE_OK) { /* write OK? */
uptr->pos = gap_pos; /* restore orig pos */
return st; /* PNU was set by wrdata */
}
uptr->pos = uptr->pos - meta_size / 2; /* realign position */
gap_alloc = gap_alloc - 2; /* decrease gap to write */
}
marker_count = gap_alloc / meta_size; /* count of gap markers */
do {
st = sim_tape_wrdata (uptr, MTR_GAP); /* write gap markers */
if (st != MTSE_OK) { /* write OK? */
uptr->pos = gap_pos; /* restore orig pos */
return st; /* PNU was set by wrdata */
}
}
while (--marker_count > 0);
return MTSE_OK;
}
/* Space record forward */
t_stat sim_tape_sprecf (UNIT *uptr, t_mtrlnt *bc)
@@ -669,7 +925,13 @@ return SCPE_OK;
t_stat sim_tape_show_capac (FILE *st, UNIT *uptr, int32 val, void *desc)
{
if (uptr->capac) fprintf (st, "capacity=%dMB", (uint32) (uptr->capac / ((t_addr) 1000000)));
if (uptr->capac) {
if (uptr->capac >= (t_addr) 1000000)
fprintf (st, "capacity=%dMB", (uint32) (uptr->capac / ((t_addr) 1000000)));
else if (uptr->capac >= (t_addr) 1000)
fprintf (st, "capacity=%dKB", (uint32) (uptr->capac / ((t_addr) 1000)));
else fprintf (st, "capacity=%dB", (uint32) uptr->capac);
}
else fprintf (st, "unlimited capacity");
return SCPE_OK;
}