The design and implementation of a multi-programming virtual memory operating system for a mini-computer

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ice P-:1- e .ac e or ot cier

in Physics at the

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Acknowledgements

members of the Architecture Machine Group for their help,

Lee Parks

CONTENTS

. eyona i:.me-snaring

..

2.4 Some Major Hardware Developments ... 24 ...

4.1 The MagicSix Hardware ... 48

5.3 VM/370 on the IBM 4341 or 4331 ... 60 5.4 Comparison Summary ... 62

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No 0 n 0 o a TT

Nag icSix - 6 - Lee Parks

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1. Introduction

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8 -

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part, is reasonable time. The list of failures, in whole or in mugs

ses were not completed on time. So operating systems

tem to be created remain with us today and will have

succes

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4,, I -I ~

~u u~u tIiu~ y~ qyj~

Lb

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r ,j ni f. I r

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as much as possible in PL/1. It the Interdata 7/32 to be writter - 1 1

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722

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n m ino ,yQi m AiF f'n " nn i- - nr 1 I -o

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-

~

any beeftedfrm heprog-ram format. Debugging tools s-imil

rears. It Arguments for and against time-sharing have raged for 3

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2.3 Beyond Time-sharing

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In our society, people like to have a sense of ownership,

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red one through four and loaded into memory in that order at numb(

no programs larger than either two and three are fixed in memory

TOu-a invoive searcning tnrougn memory aftresses. Tnis proces

S~ILin 1ifl flHuSp-due dL U -

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ev

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TLT

i'

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Fig. 1.

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Fig. 2.

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inter-related computer small, trivial programs to large, complex,

incremental aeveiopment. Iurtnermore, many or the systems would

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tion it-as pointofie, tanfrrat From an implementa

s would greatly speed development. Some desirable system feature - 35

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w%- 0 11 mV U

-camius the Multics

sso-in:llv

rer-experience of these two systems helped to form a firm if not

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Pnt. Thns qn

iihitpi

rpfer

recursive. A procedure object is not quite the re-entrant and

tr . 0r 'Li W JU e

..

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Wnam S dIi not hL rin Li th a " > w tini s ifPni

working directory was relative pathame provided the

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VU--L~lLI-U C -L--T 'P 77 U= UI -a Trg 7-7 -0 i -

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fre

ely pass pointers to segments back and forth (subject to

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users; MagicSix is no exception. ULI UU W iL LT UL t L A LIii

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1.

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Every system has a model of its

that is designed for paper fora

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eiii Lo~e~J proi seq M.l~ail Lxztti ss~i~ 1 rnl -v- o- o nc ur r

eled after extensible real-time display oriented editor. It is mod

users ot a system

cannot

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0 IbQ' 2

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r. A sample

A

absolute pathname would be: characte

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-l Jn he Jdeign ofA atlAJagiclix file- Avste;. c.re as takent

should somehow be created, the error will disappear if one of the

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SComprison _{with Other Systej~}

some of its it is still useful to compare MagicSix to

ring system was developed by Bell Labs in 1971 to The Unix operal

the VAX 11/780. [UNIX]

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. .. . - - -eli~t

ae

decision. nix

bject

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ch is not a true high level entirely written in BLISS, whi

oe us u u~lv eu t.Ly dre9s mUC more memory ttnan L

1-1 'CLL he -u -jC- e U 1e W T t fe z

e 1 -

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i

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spprystems u e inui ae for n syse m p o-yram

systems

system

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s between software crashes. The have been however, some conspicuou successes and failures.

Lchine is to multi-program real-time tasks. It important if the me

ng would be improved if the hardware supported interupt handli - 63

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1r~vei4-~ 1 - A k

Lee Parks

npinyinvRm tji6l r h nn Ry

wwi Q;

bout file I/0. segments has freed users from needing to learn a

open a file and read its contents into a local array. Programmers

wno LJave ada tnas iU Zi5pLIP es neii vcr ,s.

6.2 Extensions

to use, and to write a PL/1 display-oriented debugger. There are

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i U

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sAyrdlx

MainteigIUm

system programmers to however, the lab will need to train new

should be addressed.

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- 72 - -Lee Parks

Appendix II - References

W] Weinreb, Daniel L. A Real-Time Dis lav-Oriente-d Editor for [DL

ificial Intelligence Laboratory Memo 447, MIT Al MIT Art

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