KDF9 — Algol Users Manual — extracts

Here are some parts of the Algol Users Manual likely to be useful to users of the KDF9 Algol compilers.
An earlier presentation of this manual can be seen here.
Appendix L list of failure messages
Appendix M List of I/O failures
Appendix C Hardware representation of Algol Basic Symbols etc
Section 2: KDF9 Extensions to the Language
Section 3: KDF9 Algol Input/Output System
Section 4: The POST System