The Multics development team produced many different series of documents describing Multics and our plans and progress in building it, beginning in the mid 1960s and ending when the system was cancelled in mid 1980. Some documents are available on this site:
- AW17: Multics Commands and Active Functions pocket guide (101K, 04/01/80, posted 09/15/20)
- AG91: Multics Programmers' Manual: Reference Guide Table of Contents (128K, 1984, posted 08/10/20)
- Reserved Segment Name Suffixes AG91 Appendix E (21K, 11/24/98)
- Multics System Programmer's Manual Table of Contents
(187K, posted 03/21/21, 838 sections, 54 online)
- BA.1 MSPM- General Information (9K, 07/26/68)
- BA.2 Summary of Multics Technical Policy (11K, 07/26/65)
- BA.3.00 Documentation Conventions (12K, 05/19/66)
- BB.2 System Module Interfaces (PL/I Subset for System Programming) (24K, 9 figures, 6/24/66)
- BB.2.01 EPL Subset for System Programming (11K, 01/31/69)
- BB.3.01 Multics Standard Tape Format (14K, 06/02/67)
- BX.1.00 Multics Command Language (24K, 10/29/68)
- Multics Checkout Bulletins Index (39K, 03/21/21, 111 documents, 0 online)
- Multics Technical Bulletins Index (241K, 03/21/21, 731 documents, 724 online)
- Multics Administrative Bulletins Index (17K, 03/21/21, 18 documents, 8 online)
- Multics Staff Bulletins Index (35K, 03/21/21, 83 documents, 82 online)
- Multics Change Requests Index (610K, 03/21/21, 2245 documents, 1360 online)
Sections describing the development document series follow.
Multics Design Notebook
The very early plans for Multics were described in a set of Project MAC memos called the Multics Design Notebook. These memos were written in 1964 and circulated to the system builders and to other OS researchers to explain what MIT wanted from its next machine. In Section I: Introduction Prof. Corbató mentions that the choice of GE as the system vendor had already been made as of November 64. Most MDN sections were written by MIT Project MAC personnel: there are a few sections by Bell Labs and GE personnel. 27 sections have been scanned by The Multics History Project (MHP) and a scanned online copy of the MDN is on Prof. Saltzer's web site.
The Multics System Programmers' Manual (MSPM) was intended to be the primary design document for Multics. Most of the MSPM was written between 1965 and 1969. The MSPM has been scanned by MHP and a scanned online copy of the MSPM is on Prof. Saltzer's web site. The Table of Contents and 7 of the 838 sections are on this site:
- BA.1 MSPM- General Information
- General statement of what the MSPM was for. (5K, 07/26/68)
- BA.2 Summary of Multics Technical Policy
- Key technical directions, e.g. segments don't overlap, need permission to write master mode. (5K, 07/26/65)
- BA.3.00 Documentation Conventions
- Labeling and content of MSPM sections. (8K, 05/19/66)
- BB.2 System Module Interfaces (PL/I Subset for System Programming)
- Data formats and programming conventions. Note that many of the formats described in this section are specific to EPL and were changed radically when later versions of the PL/I compiler were introduced. (19K, 9 figures, 6/24/66)
- BB.2.01 EPL Subset for System Programming
- Definition of the REPL subset of EPL. (6K, 01/31/69)
- BB.3.01 Multics Standard Tape Format
- The format of Multics "native" tapes. (9K, 06/02/67)
- BX.1.00 Multics Command Language
- The definition of the Multics command language. Interpretation of commands, Shell, Listener, special characters. (18K, 10/29/68)
Multics Programmer's Manual
The Multics Programmers' Manual (MPM) was begun at Project MAC in 1965 as the follow-on manual to the CTSS User's Guide. As described below, these manuals were taken over by Honeywell, and assigned Honeywell document numbers.
During the early development phase of the project, 1965 to 1968, there were a number of other documents that didn't fit into the MSPM. Technical white papers, tool documentation, and so forth were assigned a "repository number" and published to the project. There were three series: M for MIT Project MAC, B for Bell Labs, and G for General Electric. There were about 100 documents in each series, but the online table does not list those that were later obsoleted.
Multics Planning Notebook
The Multics Planning Notebook (MPN) was a multi-section management document which described Multics production milestones and tasks in the 1967-69 time frame. These memos have been scanned by MHP but are not available online.
Checkout Bulletins and Related Documents
Multics Checkout Bulletins (MCBs), and their successors Multics Technical Bulletins (MTBs), were design documents created by the development staff proposing, explaining, and expanding ideas for changes to Multics. As described in "The Multics System Programming Process," one or more MCBs would be written as the first step in introducing a significant change to the system. MCB numbers started at 1 and went up to 1130, before the series was replaced in 1978 by MTBs (because Multics "checkout" was finished). A partial Multics Checkout Bulletins Index is available online. (Jerry Saltzer preserved a few of these.)
The MTB series began in 1973 and continued on into the 1980s. (An index of 731 MTBs from 1973 to 1987 (241K, 03/21/21) is available online.) At first, MCBs also covered task assignments and schedules, but later these kinds of documents were put into a different series, Multics Task Reports (MTRs) from 1973-1983. Some of these memos have been scanned by MHP but are not available online.
Project MAC's Computer Systems Research Group produced a series of 55 Multics Performance Log (MPL) memos from 1969-1971. GE personnel wrote several of these. (MHP has these.)
A series of memos were written about 1970 describing the proposed system design of the "follow-on" machine to the 645. This machine eventually became the Honeywell 6180. The series was called Multics Hardware Design Memos (MHDM). MHDM-12 by Corby was the one cited in the MIT/GE agreements.
In 1971-73 Multics Staff Bulletins (MSBs) were produced: they began as a set of memos listing tasks to be done, and later added technical memos on various system improvements. (MHP scanned these; 82 are online.)
There were also 18 Multics Administrative Bulletins (MABs) describing rules and practices to be followed. (We have 8 online, and MHP has a few more.)
Multics Operating Staff Notes (MOSNs) informed the system operators at MIT of procedural changes; many of these were combined into a Honeywell manual, the Multics Operator's Handbook. (MHP has a few of these from 1970-73.)
Between 1980 and 1983, 17 documents in the Multics Alternative Documentation (MAD) series were produced by and for Multics site analysts.
MIT Project MAC produced many Technical Reports and Technical Memos. MIT theses that were done using MAC facilities were often published as TRs or TMs. The MIT Library 2000 project scanned a large number of these documents and the images and abstracts are available online on a server provided by the MIT Libraries. See the Multics Bibliography for pointers to these documents.
In 1976-85 the MIT LCS Computer Systems Research group produced 276 CSR-RFC memos: up to about 1977, some of these were about Multics. (MHP has these.)
From 1973-78 a series of 449 Multics Installation Bulletins (MIBs) were produced by the MIT IPC Library Maintenance group. (MHP has the whole series.)
In 1976-84 MIT IPC produced 211 Multics System Status memos (MSS) describing system uptime status and crash analysis. (MHP has these.)
Multics Change Documents
In order to make any change to Multics, even a one-line fix, a programmer had to fill out a Multics Change Request (MCR) and have it approved by the MCR Board. This practice was instituted in 1973, and is documented in "The Multics System Programming Process". The online list of MCRs has not survived, but lists of 1360 approved MCRs from 1973 through 1980 have been saved by MHP, as well as MCR packets and minutes from the Phoenix MCRB from 1980-1987. An incomplete Index of Multics Change Requests covering 1973-1976 is available online.
Once a change request was approved, the programmer filled out a "yellow form," which told the program librarians which source modules to pick up, how to recompile them, and how to integrate them into the operating system. The yellow form required the signatures of the programmer, programmer's manager, auditor, and documentation representative. The MCR and yellow form were replaced by electronic versions in the 1980s, near the end of the system's development. MAB-048 describes the rules for the MCR board as of 1985 and contains a sample MCR form.
Multics Trouble Reports
Trouble reports were submitted by Multics site analysts, or generated internally by developers. A trouble report database was maintained and TR state was tracked. No examples seem to have survived.
When Honeywell turned Multics into a commercial product, one of its steps was to take over the MPM and produce it as a four-volume set of standard Honeywell printed manuals, numbered AG90, AG91, AG92, and AG93. Honeywell eventually produced almost 100 manuals describing Multics. Many of these manuals have been scanned and put online by Al Kossow. Manual AW17 was a brief summary of commands.
Papers, Books, and Articles
Over 342 conference papers, books, and articles about Multics were written during the system's lifetime, many by members of the development team. There is a separate index page for papers available online.