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Welcome

This is a Web site to collect, save, and share information about the Michigan Terminal System (MTS), the computer time-sharing operating system, and the organizations and people that developed and ran it. The documents, images, recollections, and comments that make up this Web site come from many sources. It is our hope that individuals will contribute many more.

See the MTS Article on Wikipedia for a good overview of MTS, its architecture, and the sites that developed and ran it.
 
Anyone can view the contents of this archive, but only members of the Google Groups' group "# (Pound Sign)" can create and edit pages, upload documents and files, start discussions, and enter comments. To start, the group is only being used to control access to this archive site and not as an e-mail list. Anyone with a Google account may join this group. If you don't have a Google account, you can create one. They are free. If you just want to view items in the archive, you do not need to join. If you would like to contribute, click here to visit and join the group.

The "official" URL to use to reach this site is:
Send questions and comments to jeff.ogden@umich.edu or gavin.eadie@umich.edu


News and updates

11 January 2011
MTS manuals and documentation at BitSavers.org

In addition to the documentation available in the "Manuals and documentation" section of this web site, as of 11 January 2011 most of the material is also available at BitSavers.org in the directories:

9 December 2010
The octothorpe and "one of the great comeback stories in the history of competitive punctuation"

John Hogg passed along the following item:

"What we have here is one of the great comeback stories in the history of competitive punctuation" according to Robert Fulford writing about the octothorpe in a column in the opinion section of the National Post on 30 November 2010.

Since # is the MTS Command Prefix character, the MTS Community has a special fondness for the octothorpe (or pound-sign, number-sign, hash, sharp, ...) and I [Jeff] am happy to see it making a comeback.

For more on the octothorpe.


30 November 2010
Figure 1 from MTS Lecture 1:
    ▲                                           ┌────┐ ┌─────┐                       ▲
│ ┌───────────┤HASP│ │OTHER│ │
│ │ ┌─────┐ ┌─┴────┴─┴─────┴─┐ │
│ │ │ │ │ │ RELOCATABLE
│ │ │CLSs │ │ DSRs │ │
│ │ │ │ │ │ │
│ │ └────┬┘ └──┬─────┬────┬──┘ ┌─┐ ┌────┐ │
│ ┌┴┐ ┌┴─┐ ┌┴┐ │FILE├──────┤8├───────┤FILE│ │
│ │5│ │12│ │7│ └────┘ └─┘ │ │ │
│ └┬┘ └─┬┘ └┬┘ │RTNS│ │
│ ┌────────┐ ┌──┴─┐ ┌─┴────┴───┐ ┌─┐ │ │ │
│ │ │ ┌─┐ │ │ │ ├─────────────────┤9├───┤ │ │
│ │HASPLING├──┤4├──┤HASP├─┐ │ MTS │ ┌──┐ ┌──────┐ └─┘ └────┘ │
PROBLEM │ │ └─┘ │ │ │ │ ├──┤11├──┤ │ │
STATE └──────┬─┘ └──┬─┘ │ └───┬────┬─┘ └──┘ │LOADER│ ▼
│ │ │ │ │ │ │ │ ─────────
│ │ │ ┌┴┐ ┌┴┐ │ └──────┘ ▲
│ │ │ │6│ │6│ │ │
│ ┌───────┐ │ │ └┬┘ └┬┘ │ ABSOLUTE
│ ┌─┴─────┐ │ │ │ │ ┌───┴┐ │ ┌───┐ │
│ │OTHERS ├─┘ │ │ │ │ │ │ │ │ ┌────┐ │
│ ┌─┴─────┐ │ │ │ └─┤JOBS│ │ │PDP│ │SUPR│ ┌───────┐ │
│ │REWIND ├─┘ │ │ │ │ │ │ │ │SUBR│ │ │ │
│ └──────┬┘ │ │ └──┬─┘ │ └─┬─┘ └──┬─┘ │MACHINE│ │
▼ ┌┴┐ ┌┴┐ ┌┴┐ ┌┴┐ ┌┴┐ ┌┴─┐ ┌┴┐ │ │ │
─────── │3│ │3│ │3│ │3│ │3│ │10│ │2│ │ CHECK │ │
▲ └┬┘ └┬┘ └┬┘ └┬┘ └┬┘ └┬─┘ └┬┘ │ │ │
│ ┌─┴────────┴────────────┴────────┴─────┴─────┴──┐ │ │HANDLER│ │
│ │ │ │ │ │ │
│ │ SUPERVISOR ├─────┘ │ │ │
SUPERVISOR │ │ └───────┘ │
STATE └───┬───────────────────────────────────────────┘ │
│ ┌┴┐ │
│ │1│ │
│ └┬┘ │
│ ┌──────┴────────────────────── . . . │
│ │ HARDWARE │
▼ │ ▼

For more on Figure 1.

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