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To: Users
From: Bob Supnik
Subj: VAX Simulator Usage
Date: 04-Apr-2004
COPYRIGHT NOTICE
The following copyright notice applies to both the SIMH source and binary:
Original code published in 1993-2004, written by Robert M Supnik
Copyright (c) 1993-2004, 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.
This memorandum documents the VAX simulator.
1. Simulator Files
To compile the VAX, you must define VM_VAX and USE_INT64 as part of the compilation
command line. To enable extended file support (files greater than 2GB), you must
define USE_ADDR64 as part of the command line as well.
sim/ scp.h
sim_console.h
sim_defs.h
sim_ether.h
sim_fio.h
sim_rev.h
sim_sock.h
sim_tape.h
sim_timer.h
sim_tmxr.h
scp.c
sim_console.c
sim_ether.c
sim_fio.c
sim_sock.c
sim_tape.c
sim_timer.c
sim_tmxr.c
sim/vax/ vax_defs.h
vaxmod_defs.h
vax_cpu.c
vax_cpu1.c
vax_fpa.c
vax_io.c
vax_mmu.c
vax_stddev.c
vax_sys.c
vax_sysdev.c
sim/pdp11/ pdp11_mscp.h
pdp11_uqssp.h
pdp11_xq.h
pdp11_xq_bootrom.h
pdp11_dz.c
pdp11_lp.c
pdp11_pt.c
pdp11_rl.c
pdp11_ry.c
pdp11_rq.c
pdp11_tq.c
pdp11_ts.c
pdp11_xp.c
Additional files are:
sim/vax/ ka655.bin standard boot ROM code
ka655x.bin extended memory boot ROM code
2. VAX Features
The VAX simulator is configured as follows:
device simulates
name(s)
CPU KA655 CPU with 16MB-64MB of memory, or
"KA655X" CPU with 16MB-512MB of memory
TLB translation buffer
ROM read-only memory
NVR non-volatile memory
SYSD system devices
QBA Qbus adapter
PTR,PTP PCV11 paper tape reader/punch
TTI,TTO console terminal
LPT LPV11 line printer
CLK real-time clock
DZ DZV11 4-line terminal multiplexor (up to 4)
RL RLV12/RL01(2) cartridge disk controller with four drives
RQ RQDX3 MSCP controller with four drives
RQB second RQDX3 MSCP controller with four drives
RQC third RQDX3 MSCP controller with four drives
RQD fourth RQDX3 MSCP controller with four drives
RY RXV21 floppy disk controller with two drives
TS TSV11/TSV05 magnetic tape controller with one drive
TQ TQK50 TMSCP magnetic tape controller with four drives
XQ DELQA/DEQNA Ethernet controller
XQB second DELQA/DEQNA Ethernet controller
The PTR, PTP, LPT, DZ, RL, RQ, RQB, RQC, RQD, RY, TS, TQ, XQ, and XQB
devices can be set DISABLED. RQB, RQC, RQD, and XQB are disabled by
default.
The VAX simulator implements several unique stop conditions:
- change mode to interrupt stack
- illegal vector (bits<1:0> = 2 or 3)
- unexpected exception during interrupt or exception
- process PTE in P0 or P1 space instead of system space
- unknown IPL
- infinite loop (BRB/W to self at IPL 1F)
The VAX supports a simple binary format consisting of a stream of
binary bytes without origin or checksum, for loading memory, the boot
ROM, or the non-volatile memory.
2.1 CPU and System Devices
2.2 CPU
CPU options include the size of main memory and the treatment of the
HALT instruction.
SET CPU EXTEND enable extended memory support
SET CPU NOEXTEND disable extended memory support
SET CPU 16M set memory size = 16MB
SET CPU 32M set memory size = 32MB
SET CPU 48M set memory size = 48MB
SET CPU 64M set memory size = 64MB
SET CPU 128M set memory size = 128MB
SET CPU 256M set memory size = 256MB
SET CPU 512M set memory size = 512MB
SET CPU SIMHALT kernel HALT returns to simulator
SET CPU CONHALT kernel HALT returns to boot ROM console
The CPU implements a show command to display the I/O address map:
SHOW CPU IOSPACE show I/O space address map
Notes of the memory size:
- The real KA655 CPU only supported 16MB to 64MB of memory. The simulator
provides a KA655"X" mode, which increases supported memory to 512MB.
Extended memory is enabled by default. If extended memory is enabled,
and memory size exceeds 64MB, the CPU will boot using special firmware
ka655x.bin. This firmware contains code to determine the size of extended
memory and set up the PFN bit map accordingly. Other than setting up
the PFN bootmap, the firmware does not recognize extended memory and
will behave as though memory size was 64MB.
- If memory size is being reduced, and the memory being truncated contains
non-zero data, the simulator asks for confirmation. Data in the truncated
portion of memory is lost.
- If the simulator is running VMS, the operating system may have a SYSGEN
parameter set called PHYSICXAL PAGES (viewable from "MCR SYSGEN SHOW
PHYSICALPAGES"). PHYSICALPAGES limits the maximum number of physical pages
of memory the OS will recognize. If it is set to a lower value than the
new extended memory size of the machine, then only the first PHYSICALPAGES
of memory will be recognized, otherwise the actual size of the extended
memory will be realized by VMS upon each boot. Some users and/or sites
may specify the PHYSICALPAGES parameter in the input file to AUTOGEN
(SYS$SYSTEM:MODPARAMS.DAT). If PHYSICALPAGES is specified there, it will
have to be adjusted before running AUTOGEN to recognize more memory. The
default value for PHYSICALPAGES is 1048576, which describes 512MB of RAM.
Initial memory size is 16MB.
Memory can be loaded with a binary byte stream using the LOAD command.
The LOAD command recognizes three switch:
-o origin argument follows file name
-r load the boot ROM
-n load the non-volatile RAM
The CPU supports the BOOT command and is the only VAX device to do so.
Note that the behavior of the bootstrap depends on the capabilities of
the console terminator emulator. If the terminal window supports full
VT100 emulation (including Multilanguage Character Set support), the
bootstrap will ask the user to specify the language; otherwise, it will
default to English.
These switches are recognized when examining or depositing in CPU memory
(or any other byte oriented device):
-b examine/deposit bytes
-w examine/deposit words
-l examine/deposit longwords
-d data radix is decimal
-o data radix is octal
-h data radix is hexadecimal
-v interpret address as virtual, current mode
CPU registers include the visible state of the processor as well as the
control registers for the interrupt system.
name size comments
PC 32 program counter
R0..R14 32 R0..R14
AP 32 alias for R12
FP 32 alias for R13
SP 32 alias for R14
PSL 32 processor status longword
CC 4 condition codes, PSL<3:0>
KSP 32 kernel stack pointer
ESP 32 executive stack pointer
SSP 32 supervisor stack pointer
USP 32 user stack pointer
IS 32 interrupt stack pointer
SCBB 32 system control block base
PCBB 32 process controll block base
P0BR 32 P0 base register
P0LR 22 P0 length register
P1BR 32 P1 base register
P1LR 22 P1 length register
SBR 32 system base register
SLR 22 system length register
SISR 16 software interrupt summary register
ASTLVL 4 AST level register
CADR 8 cache disable register
MSER 8 memory system error register
MAPEN 1 memory management enable flag
TRPIRQ 8 trap/interrupt pending
CRDERR 1 correctible read data error flag
MEMERR 1 memory error flag
PCQ[0:63] 32 PC prior to last PC change or interrupt;
most recent PC change first
WRU 8 interrupt character
The CPU can maintain a history of the most recently executed instructions.
This is controlled by the SET CPU HISTORY and SHOW CPU HISTORY commands:
SET CPU HISTORY clear history buffer
SET CPU HISTORY=0 disable history
SET CPU HISTORY=n enable history, display length = n
SHOW CPU HISTORY print CPU history
The maximum length for the history is 65536 entries.
2.1.2 Translation Buffer (TLB)
The translation buffer consists of two units, representing the system
and user translation buffers, respectively. It has no registers. Each
translation buffer entry consists of two 32b words, as follows:
word n tag
word n+1 cached PTE
An invalid entry is indicated by a tag of FFFFFFFF.
2.1.3 Read-only memory (ROM)
The boot ROM consists of a single unit, representing the 128KB boot ROM.
It has no registers. The boot ROM is loaded with a binary byte stream
using the LOAD -r command:
LOAD -r KA655.BIN load boot ROM image KA655.BIN
ROM accesses a use a calibrated delay that slows ROM-based execution to
about 500K instructions per second. This delay is required to make the
power-up self-test routines run correctly on very fast hosts. The delay
is controlled with the commands:
SET ROM NODELAY ROM runs like RAM
SET ROM DELAY ROM runs slowly
2.1.4 Non-volatile Memory (NVR)
The NVR consists of a single unit, representing 1KB of battery-backed up
memory. When the simulator starts, NVR is cleared to 0, and the SSC
battery-low indicator is set. Normally, NVR is saved and restored like
other memory in the system. Alternately, NVR can be attached to a file.
This allows its contents to be saved and restored independently of
other memories, so that NVR state can be preserved across simulator runs.
Successfully loading an NVR image clears the SSC battery-low indicator.
2.1.5 System Devices (SYSD)
The system devices are the facilities implemented in KA655 CPU board,
the CMCTL memory controller, and the SSC system support chip. Note that
the simulation of these devices is incomplete and is intended strictly
to allow the patched bootstrap code to run. The SYSD registers are:
name size comments
CMCSR[0:17] 32 CMCTL control and status registers
CACR 8 second-level cache control register
BDR 8 front panel jumper register
BASE 29 SSC base address register
CNF 32 SSC configuration register
BTO 32 SSC bus timeout register
TCSR0 32 SSC timer 0 control/status register
TIR0 32 SSC timer 0 interval register
TNIR0 32 SSC timer 0 next interval register
TIVEC0 9 SSC timer 0 interrupt vector register
TCSR1 32 SSC timer 1 control/status register
TIR1 32 SSC timer 1 interval register
TNIR1 32 SSC timer 1 next interval register
TIVEC1 9 SSC timer 1 interrupt vector register
ADSM0 32 SSC address match 0 address
ADSK0 32 SSC address match 0 mask
ADSM1 32 SSC address match 1 address
ADSK1 32 SSC address match 1 mask
CDGDAT[0:16383] 32 cache diagnostic data store
BDR<7> is the halt-enabled switch. It controls how the console firmware
responds to a BOOT command, a kernel halt (if option CONHALT is set), or
a console halt (BREAK typed on the console terminal). If BDR<7> is set,
the console firmware responds to all these conditions by entering its
interactive command mode. If BDR<7> is clear, the console firmware
boots the operating system in response to these conditions.
2.1.6 Qbus Adapter (QBA)
The QBA represents the CQBIC Qbus adapter chip. The QBA registers are:
name size comments
SCR 16 system configuration register
DSER 8 DMA system error register
MEAR 13 master error address register
SEAR 20 slave error address register
MBR 29 Qbus map base register
IPC 16 interprocessor communications register
IPL17 32 IPL 17 interrupt flags
IPL16 32 IPL 16 interrupt flags
IPL15 32 IPL 15 interrupt flags
IPL14 32 IPL 14 interrupt flags
2.2 I/O Device Addressing
Qbus I/O space is not large enough to allow all possible devices to be
configured simultaneously at fixed addresses. Instead, many devices have
floating addresses; that is, the assigned device address depends on the
presense of other devices in the configuration:
DZ11 all instances have floating addresses
RL11 first instance has fixed address, rest floating
RX11/RX211 first instance has fixed address, second floating
MSCP disk first instance has fixed address, rest floating
TMSCP tape first instance has fixed address, rest floating
To maintain addressing consistency as the configuration changes, the
simulator implements DEC's standard I/O address and vector autoconfiguration
algorithms for devices DZ, RL, RQ, and TQ. This allows the user to
enable or disable devices without needing to manage I/O addresses
and vectors.
In addition to autoconfiguration, most devices support the SET ADDRESS
command, which allows the I/O page address of the device to be changed,
and the SET VECTOR command, which allows the vector of the device to be
changed. Explicitly setting the I/O address of a device which normally
uses autoconfiguration DISABLES autoconfiguration for that device and for
the entire system. As a consequence, the user may have to manually configure
all other autoconfigured devices, because the autoconfiguration algorithm
no longer recognizes the explicitly configured device. A device can be
reset to autoconfigure with the SET <device> AUTOCONFIGURE command. Auto-
configuration can be restored for the entire system with the SET CPU
AUTOCONFIGURE command.
The current I/O map can be displayed with the SHOW CPU IOSPACE command.
Addresses that have set by autoconfiguration are marked with an asterisk (*).
All devices support the SHOW ADDRESS and SHOW VECTOR commands, which display
the device address and vector, respectively.
2.3 Programmed I/O Devices
2.3.1 PC11 Paper Tape Reader (PTR)
The paper tape reader (PTR) reads data from a disk file. The POS
register specifies the number of the next data item to be read. Thus,
by changing POS, the user can backspace or advance the reader.
The paper tape reader implements these registers:
name size comments
BUF 8 last data item processed
CSR 16 control/status register
INT 1 interrupt pending flag
ERR 1 error flag (CSR<15>)
BUSY 1 busy flag (CSR<11>)
DONE 1 device done flag (CSR<7>)
IE 1 interrupt enable flag (CSR<6>)
POS 32 position in the input file
TIME 24 time from I/O initiation to interrupt
STOP_IOE 1 stop on I/O error
Error handling is as follows:
error STOP_IOE processed as
not attached 1 report error and stop
0 out of tape
end of file 1 report error and stop
0 out of tape
OS I/O error x report error and stop
2.3.2 PC11 Paper Tape Punch (PTP)
The paper tape punch (PTP) writes data to a disk file. The POS
register specifies the number of the next data item to be written.
Thus, by by changing POS, the user can backspace or advance the punch.
The paper tape punch implements these registers:
name size comments
BUF 8 last data item processed
CSR 16 control/status register
INT 1 interrupt pending flag
ERR 1 error flag (CSR<15>)
DONE 1 device done flag (CSR<7>)
IE 1 interrupt enable flag (CSR<6>)
POS 32 position in the output file
TIME 24 time from I/O initiation to interrupt
STOP_IOE 1 stop on I/O error
Error handling is as follows:
error STOP_IOE processed as
not attached 1 report error and stop
0 out of tape
OS I/O error x report error and stop
2.3.3 Terminal Input (TTI)
The terminal interfaces (TTI, TTO) can be set to one of two modes:
7B or 8B. In 7B mode, input and output characters are masked to 7
bits. In 8B mode, characters are not modified. Changing the mode
of either interface changes both. The default mode is 8B.
When the console terminal is attached to a Telnet session, it
recognizes BREAK. If BREAK is entered, and BDR<7> is set, control
returns to the console firmware; otherwise, BREAK is treated as a
normal terminal input condition.
The terminal input (TTI) polls the console keyboard for input. It
implements these registers:
name size comments
BUF 8 last data item processed
CSR 16 control/status register
INT 1 interrupt pending flag
ERR 1 error flag (CSR<15>)
DONE 1 device done flag (CSR<7>)
IE 1 interrupt enable flag (CSR<6>)
POS 32 number of characters input
TIME 24 keyboard polling interval
If the simulator is compiled under Windows Visual C++, typing ^C to the
terminal input causes a fatal run-time error. Use the following command
to simulate typing ^C:
SET TTI CTRL-C
2.3.4 Terminal Output (TTO)
The terminal output (TTO) writes to the simulator console window. It
implements these registers:
name size comments
BUF 8 last data item processed
CSR 16 control/status register
INT 1 interrupt pending flag
ERR 1 error flag (CSR<15>)
DONE 1 device done flag (CSR<7>)
IE 1 interrupt enable flag (CSR<6>)
POS 32 number of characters input
TIME 24 time from I/O initiation to interrupt
2.3.5 Line Printer (LPT)
The line printer (LPT) writes data to a disk file. The POS register
specifies the number of the next data item to be written. Thus,
by changing POS, the user can backspace or advance the printer.
The line printer implements these registers:
name size comments
BUF 8 last data item processed
CSR 16 control/status register
INT 1 interrupt pending flag
ERR 1 error flag (CSR<15>)
DONE 1 device done flag (CSR<7>)
IE 1 interrupt enable flag (CSR<6>)
POS 32 position in the output file
TIME 24 time from I/O initiation to interrupt
STOP_IOE 1 stop on I/O error
Error handling is as follows:
error STOP_IOE processed as
not attached 1 report error and stop
0 out of paper
OS I/O error x report error and stop
2.3.6 Real-Time Clock (CLK)
The clock (CLK) implements these registers:
name size comments
CSR 16 control/status register
INT 1 interrupt pending flag
IE 1 interrupt enable flag (CSR<6>)
TODR 32 time-of-day register
BLOW 1 TODR battery low indicator
TIME 24 clock frequency
TPS 8 ticks per second (100)
The real-time clock autocalibrates; the clock interval is adjusted up or
down so that the clock tracks actual elapsed time.
2.3.7 DZV11 Terminal Multiplexor (DZ)
The DZV11 is an 4-line terminal multiplexor. Up to 4 DZ11's (16 lines)
are supported. The number of lines can be changed with the command
SET DZ LINES=n set line count to n
The line count must be a multiple of 4, with a maximum of 16.
The DZV11 supports 8-bit input and output of characters. 8-bit output
may be incompatible with certain operating systems. The command
SET DZ 7B
forces output characters to be masked to 7 bits.
The DZ11 supports logging on a per-line basis. The command
SET DZ LOG=line=filename
enables logging for the specified line to the indicated file. The
command
SET DZ NOLOG=line
disables logging for the specified line and closes any open log file.
Finally, the command
SHOW DZ LOG
displays logging information for all DZ lines.
The terminal lines perform input and output through Telnet sessions
connected to a user-specified port. The ATTACH command specifies
the port to be used:
ATTACH {-am} DZ <port> set up listening port
where port is a decimal number between 1 and 65535 that is not being used
for other TCP/IP activities. The optional switch -m turns on the DZV11's
modem controls; the optional switch -a turns on active disconnects
(disconnect session if computer clears Data Terminal Ready). Without
modem control, the DZ behaves as though terminals were directly connected;
disconnecting the Telnet session does not cause any operating system-
visible change in line status.
Once the DZ is attached and the simulator is running, the DZ will listen
for connections on the specified port. It assumes that the incoming
connections are Telnet connections. The connection remains open until
disconnected by the simulated program, the Telnet client, a SET DZ
DISCONNECT command, or a DETACH DZ command.
The SHOW DZ CONNECTIONS command displays the current connections to the DZ.
The SHOW DZ STATISTICS command displays statistics for active connections.
The SET DZ DISCONNECT=linenumber disconnects the specified line.
The DZV11 implements these registers:
name size comments
CSR[0:3] 16 control/status register, boards 0-3
RBUF[0:3] 16 receive buffer, boards 0-3
LPR[0:3] 16 line parameter register, boards 0-3
TCR[0:3] 16 transmission control register, boards 0-3
MSR[0:3] 16 modem status register, boards 0-3
TDR[0:3] 16 transmit data register, boards 0-3
SAENB[0:3] 1 silo alarm enabled, boards 0-3
RXINT 4 receive interrupts, boards 3..0
TXINT 4 transmit interrupts, boards 3..0
MDMTCL 1 modem control enabled
AUTODS 1 autodisconnect enabled
The DZV11 does not support save and restore. All open connections are
lost when the simulator shuts down or the DZ is detached.
2.4 RLV12/RL01,RL02 Cartridge Disk (RL)
RLV12 options include the ability to set units write enabled or write locked,
to set the drive size to RL01, RL02, or autosize, and to write a DEC standard
044 compliant bad block table on the last track:
SET RLn LOCKED set unit n write locked
SET RLn WRITEENABLED set unit n write enabled
SET RLn RL01 set size to RL01
SET RLn RL02 set size to RL02
SET RLn AUTOSIZE set size based on file size at attach
SET RLn BADBLOCK write bad block table on last track
The size options can be used only when a unit is not attached to a file. The
bad block option can be used only when a unit is attached to a file. Units
can also be set ONLINE or OFFLINE.
The RL11 implements these registers:
name size comments
RLCS 16 control/status
RLDA 16 disk address
RLBA 16 memory address
RLBAE 6 memory address extension (RLV12)
RLMP..RLMP2 16 multipurpose register queue
INT 1 interrupt pending flag
ERR 1 error flag (CSR<15>)
DONE 1 device done flag (CSR<7>)
IE 1 interrupt enable flag (CSR<6>)
STIME 24 seek time, per cylinder
RTIME 24 rotational delay
STOP_IOE 1 stop on I/O error
Error handling is as follows:
error STOP_IOE processed as
not attached 1 report error and stop
0 disk not ready
end of file x assume rest of disk is zero
OS I/O error x report error and stop
2.5 RQDX3 MSCP Disk Controllers (RQ, RQB, RQC, RQD)
The simulator implements four MSCP disk controllers, RQ, RQB, RQC, RQD.
Initially, RQB, RQC, and RQD are disabled. Each RQ controller simulates
an RQDX3 MSCP disk controller. RQ options include the ability to set
units write enabled or write locked, and to set the drive type to one
of many disk types:
SET RQn LOCKED set unit n write locked
SET RQn WRITEENABLED set unit n write enabled
SET RQn RX50 set type to RX50
SET RQn RX33 set type to RX33
SET RQn RD51 set type to RD51
SET RQn RD52 set type to RD52
SET RQn RD53 set type to RD53
SET RQn RD54 set type to RD54
SET RQn RD31 set type to RD31
SET RQn RA82 set type to RA82
SET RQn RA72 set type to RA72
SET RQn RA90 set type to RA90
SET RQn RA92 set type to RA92
SET RQn RAUSER{=n} set type to RA81 with n LBN's
The type options can be used only when a unit is not attached to a file.
RAUSER is a "user specified" disk; the user can specify the size of the
disk in logical block numbers (LBN's, 512 bytes each). The minimum size
is 50MB. The maximum size is 2GB if the simulator is compiled without
64b addressing, 1000GB with 64b addressing.
Units can also be set ONLINE or OFFLINE.
Each RQ controller implements the following special SHOW commands:
SHOW RQn TYPE show drive type
SHOW RQ RINGS show command and response rings
SHOW RQ FREEQ show packet free queue
SHOW RQ RESPQ show packet response queue
SHOW RQ UNITQ show unit queues
SHOW RQ ALL show all ring and queue state
SHOW RQn UNITQ show unit queues for unit n
Each RQ controller implements these registers:
name size comments
SA 16 status/address register
S1DAT 16 step 1 init host data
CQBA 22 command queue base address
CQLNT 8 command queue length
CQIDX 8 command queue index
RQBA 22 request queue base address
RQLNT 8 request queue length
RQIDX 8 request queue index
FREE 5 head of free packet list
RESP 5 head of response packet list
PBSY 5 number of busy packets
CFLGS 16 controller flags
CSTA 4 controller state
PERR 9 port error number
CRED 5 host credits
HAT 17 host available timer
HTMO 17 host timeout value
CPKT[0:3] 5 current packet, units 0-3
PKTQ[0:3] 5 packet queue, units 0-3
UFLG[0:3] 16 unit flags, units 0-3
INT 1 interrupt request
ITIME 1 response time for initialization steps
(except for step 4)
QTIME 24 response time for 'immediate' packets
XTIME 24 response time for data transfers
PKTS[33*32] 16 packet buffers, 33W each,
32 entries
Error handling is as follows:
error processed as
not attached disk not ready
end of file assume rest of disk is zero
OS I/O error report error and stop
2.6 RXV21/RX02 Floppy Disk (RY)
RXV21 options include the ability to set units write enabled or write
locked, single or double density, or autosized:
SET RYn LOCKED set unit n write locked
SET RYn WRITEENABLED set unit n write enabled
SET RYn SINGLE set unit n single density
SET RYn DOUBLE set unit n double density (default)
SET RYn AUTOSIZE set unit n autosized
The RXV21 does not support the boot command.
The RXV21 implements these registers:
name size comments
RYCS 16 status
RYBA 16 buffer address
RYWC 8 word count
RYDB 16 data buffer
RYES 12 error status
RYERR 8 error code
RYTA 8 current track
RYSA 8 current sector
STAPTR 4 controller state
INT 1 interrupt pending flag
ERR 1 error flag (CSR<15>)
TR 1 transfer ready flag (CSR<7>)
IE 1 interrupt enable flag (CSR<6>)
DONE 1 device done flag (CSR<5>)
CTIME 24 command completion time
STIME 24 seek time, per track
XTIME 24 transfer ready delay
STOP_IOE 1 stop on I/O error
SBUF[0:255] 8 sector buffer array
Error handling is as follows:
error STOP_IOE processed as
not attached 1 report error and stop
0 disk not ready
RX02 data files are buffered in memory; therefore, end of file and OS
I/O errors cannot occur.
2.7 TSV11/TSV05 Magnetic Tape (TS)
TS options include the ability to make the unit write enabled or write locked.
SET TS LOCKED set unit write locked
SET TS WRITEENABLED set unit write enabled
The magnetic tape controller implements these registers:
name size comments
TSSR 16 status register
TSBA 16 bus address register
TSDBX 16 data buffer extension register
CHDR 16 command packet header
CADL 16 command packet low address or count
CADH 16 command packet high address
CLNT 16 command packet length
MHDR 16 message packet header
MRFC 16 message packet residual frame count
MXS0 16 message packet extended status 0
MXS1 16 message packet extended status 1
MXS2 16 message packet extended status 2
MXS3 16 message packet extended status 3
MXS4 16 message packet extended status 4
WADL 16 write char packet low address
WADH 16 write char packet high address
WLNT 16 write char packet length
WOPT 16 write char packet options
WXOPT 16 write char packet extended options
ATTN 1 attention message pending
BOOT 1 boot request pending
OWNC 1 if set, tape owns command buffer
OWNM 1 if set, tape owns message buffer
TIME 24 delay
POS 32 position
Error handling is as follows:
error processed as
not attached tape not ready
end of file (read or space) end of physical tape
(write) ignored
OS I/O error fatal tape error
2.8 TQK50 TMSCP Disk Controller (TQ)
The TQ controller simulates the TQK50 TMSCP disk controller. TQ options
include the ability to set units write enabled or write locked, and to
specify the controller type and tape length:
SET TQn LOCKED set unit n write locked
SET TQn WRITEENABLED set unit n write enabled
SET TQ TK50 set controller type to TK50
SET TQ TK70 set controller type to TK70
SET TQ TU81 set controller type to TU81
SET TQ TKUSER{=n} set controller type to TK50 with
tape capacity of n MB
User-specified capacity must be between 50 and 2000 MB.
The TQ controller implements the following special SHOW commands:
SHOW TQ TYPE show controller type
SHOW TQ RINGS show command and response rings
SHOW TQ FREEQ show packet free queue
SHOW TQ RESPQ show packet response queue
SHOW TQ UNITQ show unit queues
SHOW TQ ALL show all ring and queue state
SHOW TQn UNITQ show unit queues for unit n
The TQ controller implements these registers:
name size comments
SA 16 status/address register
S1DAT 16 step 1 init host data
CQBA 22 command queue base address
CQLNT 8 command queue length
CQIDX 8 command queue index
RQBA 22 request queue base address
RQLNT 8 request queue length
RQIDX 8 request queue index
FREE 5 head of free packet list
RESP 5 head of response packet list
PBSY 5 number of busy packets
CFLGS 16 controller flags
CSTA 4 controller state
PERR 9 port error number
CRED 5 host credits
HAT 17 host available timer
HTMO 17 host timeout value
CPKT[0:3] 5 current packet, units 0-3
PKTQ[0:3] 5 packet queue, units 0-3
UFLG[0:3] 16 unit flags, units 0-3
POS[0:3] 32 tape position, units 0-3
OBJP[0:3] 32 object position, units 0-3
INT 1 interrupt request
ITIME 1 response time for initialization steps
(except for step 4)
QTIME 24 response time for 'immediate' packets
XTIME 24 response time for data transfers
PKTS[33*32] 16 packet buffers, 33W each,
32 entries
Error handling is as follows:
error processed as
not attached tape not ready
end of file end of medium
OS I/O error report error and stop
2.9 DELQA/DEQNA Qbus Ethernet Controllers (XQ, XQB)
The simulator implements two DELQA/DEQNA Qbus Ethernet controllers (XQ,
XQB). Initially, XQ is enabled, and XQB is disabled. Options allow
control of the MAC address, the controller mode, and the sanity timer.
SET XQ MAC=<mac-address> ex. 08-00-2B-AA-BB-CC
SHOW XQ MAC
These commands are used to change or display the MAC address. <mac-address>
is a valid ethernet MAC, delimited by dashes or periods. The controller
defaults to 08-00-2B-AA-BB-CC, which should be sufficient if there is
only one SIMH controller on your LAN. Two cards with the same MAC address
will see each other's packets, resulting in a serious mess.
SET XQ TYPE={DEQNA|[DELQA]}
SHOW XQ TYPE
These commands are used to change or display the controller mode. DELQA
mode is better and faster but may not be usable by older or non-DEC OS's.
Also, be aware that DEQNA mode is not supported by many modern OS's. The
DEQNA-LOCK mode of the DELQA card is emulated by setting the the controller
to DEQNA - there is no need for a separate mode. DEQNA-LOCK mode behaves
exactly like a DEQNA, except for the operation of the VAR and MOP processing.
SET XQ SANITY={ON|[OFF]}
SHOW XQ SANITY
These commands change or display the INITIALIZATION sanity timer (DEQNA
jumper W3/DELQA switch S4). The INITIALIZATION sanity timer has a default
timeout of 4 minutes, and cannot be turned off, just reset. The normal
sanity timer can be set by operating system software regardless of the
state of this switch. Note that only the DEQNA (or the DELQA in DEQNA-
LOCK mode (=DEQNA)) supports the sanity timer - it is ignored by a DELQA
in Normal mode, which uses switch S4 for a different purpose.
SET XQ POLL={DEFAULT|4..2500}
SHOW XQ POLL
These commands change or display the service polling timer. The polling
timer is calibrated to run the service thread 200 times per second. This
value can be changed to accomodate particular system requirements for
more (or less) frequent polling.
SHOW XQ STATS
This command will display the accumulated statistics for the simulated
Ethernet controller.
To access the network, the simulated Ethernet controller must be attached
to a real Ethernet interface:
ATTACH XQ0 {ethX|<device_name>} ex. eth0 or /dev/era0
SHOW XQ ETH
where X in 'ethX' is the number of the ethernet controller to attach, or
the real device name. The X number is system dependant. If you only have
one ethernet controller, the number will probably be 0. To find out what
your system thinks the ethernet numbers are, use the SHOW XQ ETH command.
The device list can be quite cryptic, depending on the host system, but
is probably better than guessing. If you do not attach the device, the
controller will behave as though the ethernet cable were unplugged.
XQ and XQB have the following registers:
name size comments
SA0 16 station address word 0
SA1 16 station address word 1
SA2 16 station address word 2
SA3 16 station address word 3
SA4 16 station address word 4
SA5 16 station address word 5
RBDL 32 receive buffer descriptor list
XBDL 32 trans(X)mit buffer descriptor list
CSR 16 control status register
VAR 16 vector address register
INT 1 interrupt request flag
One final note: because of it's asynchronous nature, the XQ controller is
not limited to the ~1.5Mbit/sec of the real DEQNA/DELQA controllers,
nor the 10Mbit/sec of a standard Ethernet. Attach it to a Fast Ethernet
(100 Mbit/sec) card, and "Feel the Power!" :-)
2.10 Symbolic Display and Input
The VAX simulator implements symbolic display and input. Display is
controlled by command line switches:
-a display as ASCII character
-c display as ASCII string
-m display instruction mnemonics
Input parsing is controlled by the first character typed in or by command
line switches:
' or -a ASCII character
" or -c ASCII string
alphabetic instruction mnemonic
numeric octal number
Instruction input uses standard VAX assembler syntax.
The syntax for specifiers is as follows:
syntax specifier displacement comments
#s^n, #n 0n - short literal, integer only
[Rn] 4n - indexed, second specifier
follows
Rn 5n - PC illegal
(Rn) 6n - PC illegal
-(Rn) 7n - PC illegal
(Rn)+ 8n -
#i^n, #n 8F n immediate
@(Rn)+ 9n -
@#addr 9F addr absolute
{+/-}b^d(Rn) An {+/-}d byte displacement
b^d AF d - PC byte PC relative
@{+/-}b^d(Rn) Bn {+/-}d byte displacement deferred
@b^d BF d - PC byte PC relative deferred
{+/-}w^d(Rn) Cn {+/-}d word displacement
w^d CF d - PC word PC relative
@{+/-}w^d(Rn) Dn {+/-}d word displacement deferred
@w^d DF d - PC word PC relative deferred
{+/-}l^d(Rn) En {+/-}d long displacement
l^d EF d - PC long PC relative
@{+/-}l^d(Rn) Fn {+/-}d long displacement deferred
@l^d FF d - PC long PC relative deferred
If no override is given for a literal (s^ or i^) or for a displacement or PC
relative addres (b^, w^, or l^), the simulator chooses the mode automatically.
Appendix - The KA655"X"
The real KA655 is limited to 64MB of memory, and the KA655 firmware is coded
to this limit. However, the VAX operating systems (VMS, Ultrix, NetBSD)
know very little about the hardware details. Instead, they take their memory
size information from the Restart Parameter Block (RPB). If the firmware
sets up an RPB for more than 64MB, the operating systems use the extra
memory without requiring source changes.
In extended memory mode, the simulator implements an 18th CMCTL register.
This read-only register gives the size of main memory in MB. The extended
memory firmware (ka655x.bin) bootstrap code uses this to set up the RPB.
No other parts of the firmware are aware of extended memory; thus, all the
diagnostic and display commands operate only on the first 64MB of memory.
If extended memory mode is disabled, the 18th CMCTL register is invisible,
and the simulator operates like a real KA655.