Multics > Library
29 Oct 1999

Source Code

An index to the Multics source files is available. (05/23/01, 444K).

Here is a small selection of Multics source files, rescued from a mangled copy of the system source formerly hosted at MIT. (A complete copy of the source code of Multics is now available at MIT, thanks to Bull.) These modules are presented for nostalgia and study, and should not be incorporated into any contemporary operating system without the advice of a trained professional.

activate.pl1

The piece of segment control that makes an AST entry for a segment and brings its page table into core.

link_snap.pl1

This piece of the linker is called in response to a linkage fault. It finds the link target and "snaps" the link.

pxss.alm

Process Exchange Switch Stack, the Multics scheduler and dispatcher.

fim.alm

Fault Interceptor Module. This program is entered from the hardware fault vector when the CPU takes a fault.

vtoc_man.pl1

The VTOC manager. See The New Storage System and It Can Be Done for a description of the functions of this module.

dialup_.pl1

The main event loop of the answering service.

bound_info_rtns_.s.archive

An archive containing the source for eight commands and four subroutines involved with presenting information to the user. check_info_segs, help, help_, list_help, list_ref_names, print_motd, resource_usage, ring0_get_, user_info_ system_info_, who, where.

calendar.pl1

This application program prints a wall calendar. See especially Dennis Capps's lengthy comments on the Easter routine.

bigletter_.pl1

A subroutine to print "big letters," used by the I/O Daemon's head and tail page.