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DEC-08-XPDAI-E-D

May 2000

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Document:	04.20.05 7703 RTS8 2B
Order Number:	DEC-08-XPDAI-E-D
Revision:
Pages:	3
Original Filename:	http://bitsavers.org/pdf/dec/spd/04.20.05_7703_RTS8_2B.pdf

OCR Text

momoomo

Software Product Description
PRODUCT NAME:

RTS/8, Version 28, Real Time Operating System

DESCRIPTION:
RTS/S is the Real-Time Operating System for the
PDP-S family (excluding the PDP-SIS) and for the
PDP-12. It allows up to 63 tasks to run concurrently
while competing for resources on a fixed priority
basis. RTS/S, once generated under OS/S, can be
entirely memory resident or have non-memory resident tasks.
RTS/S is an event driven multitasking, multiprogramming real-time operating system which in large configurations can become a development system with
OS/S as welt. The RTS/8 Executive module (task) is
entirely memory resident. The size of the executive
typically ranges from 640 to 1 K words of memory,
depending upon the number of tasks. Other features
of RTS/8 include the following:
• Maximum of 63 foreground tasks and one background (the OS/S module) task.
• Fixed priority of·,task.
• Tasks can be scheduled by themselves, by another
task, or by the operator.
• Tasks can be scheduled for execution immediately,
at a fixed interval from the time requested or at a
specific time of day.
• Tasks can be swapped into memory when
required.
• Tasks can be written onto mass storage prior to
being swapped out.
• The RTS/S executive provides facilities for tasks to
communicate with other tasks.
The following modules (tasks) are provided by DIGITAL in a format which, when tailored by the user,
constitutes a specialized RTS/S system.
RTS/8 Executive (monitor)
• Controls task execution
Schedules events (if a clock is available on the
system)
• Sends messages to system tasks
• Suspends task execution
Swap Module
This module actually swaps tasks into or out of
memory. SWAP determines whether a task is already
in memory, or whether it must be first written onto
mass storage before another task may reside in its
partition (area of memory), or whether a new task
can be swapped into memory without regard to what
was in the partition previously.
March 1977

SPD 4.20.5

Monitor Console Routine (MCR) Module
The Monitor Console Routine provides the
operator/programmer witn functions to control,
inspect, debug, suspend, schedule and print the status of tasks within the system.
Mass Storage Modules
This group of drivers accepts the same request message format to read or write blocks on the following
storage devices:
• RX8-Floppy Disk
• RKS-E-Cartridge Disk
• RK08-Cartridge Disk
• DF32/ RF08-Fixed Head Disk
• TCOS-DECtape
• LlNCtape
OSI8 Files Module
This module provides the user the ability to look-up,
create and delete files in OS/ S directories from a
foreground task. This module, when used in conjunction with one or more of the previously mentioned mass storage modules, allows the programmer the capability to read or write OS/ S files
onto the previously mentioned storage device.
OSI8 Background Module
The combination of the previously mentioned device
drivers and the OS/8 Background Module allows the
execution of any of the OS/S operating system utilities (Le., PALS, BASIC - excluding Industrial BASIC
- EDITOR, TECO, BATCH) to run under the RTS/S
executive. OS/8 is run in the top two or more memory fields under control of the KMS-E, (standard on
PDP-SI E,F,M, with SK or more core memory) or time
shared PDP-S (KTS-I or KT08) hardware option. One
of these options are required for OS/S Background
execution. In addition, a background terminal must
be dedicated to the OSI S system execution.
Clock Module
It accepts requests (in the form of RTS/8 messages)
to perform actions after a specified time has
elapsed.
Console Terminal Module
Non-Console Terminal Module
These drivers handle a single terminal in either line
or character mode. Input in line mode is terminated
by a carriage return or an ALTMODE character, and
may be edited with a RUBOUT or CRTL/U character. In character mode, input is not echoed and is
terminated by overflow of a specified character
count.
DEC-08-XPDAI-E-D

RTS/S, Version 28

SPD 4.20.5
-2-

Line Printer Module
The RTS/S line printer supports an LE-S, LSS-F or
LV-S Line Printer. Its structure is identical to line
mode in the terminal module.
Cassette Module
The RTS/S cassette driver is used with the TASE/TU60 DECcassette drives to allow the user to
read or write data on cassette.
Cassette File Module
This module allows the user to look-up, enter and
delete files from a DECcassette. When used with the
cassette driver, the user can read or write standard
CAPS-S format data files on DECcassettes.
Power Faill Auto-Restart Module
This driver provides the mechanism by which the
system can recover from a power failure. If a power
low condition occurs, the processor state is saved
and the processor is halted. When power is
restored, the processor state is restored and control
is transferred to the power fail drive.
Universal Digital CofJfroller (UDC-8)I Industrial Controller Subsystem (lCS-8)
This driver gives the user the capability of controlling all the various types of UDC/ICS modules. The
driver performs two types of actions: immediate al id
deferred. Immediate actions include reading and
sending Digital values to appropriate UDC/ICS
modules. Deferred actions may be linked to specified events within the UDC/ICS (i.e., counters overflowing, switches being thrown).
KL8A Support Module
This module allows the use of the one or more
KLSA serial 4-line handlers under RTS/S control.
NULL8A Module
This module is a special null job for the PDP-SA
which uses the LED lights to count in decimal at a
rate of approximately one increment per second.
Exit Module
This module, if present, is run before an RTS/S exit
to OS/S is completed.

MINIMUM HARDWARE REQUIRED:
Minimum RTS/S configuration for a run-time system
is as follows:
• Without OS/S or OS/12 background support:
1. Any PDP-S family processor (except a PDP-SIS)
or a PDP-12 with at least 4K words of memory
2. Console Terminal

• With OS/S or OS/12 background support:
1. Any PDP-S family processor (except a PDP-SIS)
or a PDP-12 with at least 12 K words of memory
2. Two (2) Terminals
3. RXS, TCOS, DF/RF, or RK, or LlNCtape (PDP12)
• With OS/S or OS/12 background support running
BATCH:
1. Same as above, but with 16K words of memory
Minimum RTS/S development configuration is OS/S
or OS/12 operating system configuration (which requires a PDP-S or PDP-12 with SK words of mass
storage and a OS/S supported terminal)

OPTIONAL HARDWARE SUPPORTED:
Additional memory (up to 32K words system total)
DKS-EA, DKS-EC, DKS-EP Clocks
LA30-PA, VT05 Terminals (up to 2400 baud with
KLS-JA)
VT50, VT52 Video Terminal (teletype level support)
LT33, L T35 Teletypewriters
TCOS DECtape only
DF32, RFOS, RKOS, RKS-E Disk or RXS Floppy Disk
DPS-E powerfaill auto-restart
TAS-E Cassette
UDC-S/ICS-S Industrial Control Subsytems
LE-S, LSS-F, LV-S Line Printer
LlNCtape
LA30, LA36 Serial DECwriters KLSA 4 Channel Interface
RTSS, Version 28 does not support the FPPSI A,
FPPSI E, or FPP12 nor does it support use of these
devices by the OS/S or OS/12 monitors running in
background.

PREREQUISITE SOFTWARE:
OS/S or OS/12, Version 3 or later.
OPTIONAL SOFTWARE SUPPORTED:
None
TRAINING CREDITS:
None.
SUPPORT CATEGORY:
B - Software Support will be provided as listed in
the Software Support Categories Addendum to this
SPD.

RTS/8, Version 28

SPD 4.20.5
-3-

UPDATE POLICY:
Software Updates, if any, released by DIGITAL during the one (1) year period following installation, will
be provided to the customer without additional
charge. After the first year, updates, if any, will be
made available according to then prevailing DIGITAL
policies.
ORDERING INFORMATION:
This software is furnished under a license for use on
a single CPU and can be copied and modified (with
inclusion of DIGITAL's copyright notice) only for use
on such CPU, except as may otherwise be provided
in writing by DIGITAL.
Source and I or listing options are only available after
the purchase of at least one supported license and
after a source license agreement is in effect.
The following key (A, B, C, N, Y) represents the distribution media for the product and must be specified at the end of the "0" number, i.e., OF020-XC
sources on DECtape.
A
B
C
N
Y

Linc Tape
Paper Tape
DECtape
Cassette
Floppy Disk

Sourcel Listing Options
OF020

-X- Single-use license, sources, listings,
documentation, Support Services
(media: B, C, 'N, Y)

OK020 -X- Single-use license, sources, listings,
documentation, Support Services
(media: A)
OF021

-X- Single-use license, sources, listings,
documentation, includes OS/8 Version
3C binaries, Support Services (media:
B, C, N, Y)

OK021

-X- Single-use license, sources, listings,
documentation, includes OS/8 Version
3C binaries, Support Services (media:
A)

Update Options
Users of RTS-8 whose specified Support Category
warranty has expired, may order under license the
following software update at the then current charge
for such update. The update is distributed in source
form on the appropriate medium and includes no installation or other services unless specifically stated
otherwise.
OF020

-N- RTS/8 Update Kit, updates Version 2
to Version 2B (media: B, C, N, Y)

OK020 -N- RTS/8 Update Kit, updates Version 2
to Version 2B (media: A)
OF021

-N- RTS/8 Update Kit (with OS/8) (media:
B, C, N, Y)

OK021

-N- RTS/8 Update Kit (with OS/8) (media:
A)

Users of RTS/8, Version 2 whose specified Support
Category warranty has not expired may order under
license the following software update for the then
current media charge. The update is distributed in
source form on the appropriate medium and includes no installation or other services unless specifically stated otherwise.
OF020

-V- RTS/8 Update Kit, updates Version 2
to Version 2B (media: B, C, N, Y)

OK020 -V- RTS/( Update Kit, updates Version 2
to Version 2B (media: A)

ADDITIONAL SERVICES:
None
D4.20.5