of the contents of registers,
and the ability to request new tapes after programs have been suitably
modified. Communication is done completely via the typewriter in either
octal numbers, decimal numbers, or alphanumeric codes. Register contents
are presented in similar form.

Other miscellaneous routines handle arithmetic processes, e.g., number
conversions, and communication with the input or output devices. These
routines include various format print outs, paper tape and magnetic tape
read in programs, and display subroutines.

* * * * *

[Illustration: SYSTEM BLOCK DIAGRAM FIGURE 1]

[Illustration: INSTRUCTION FORMAT FIGURE 2]

[Illustration: FIGURE 3]

* * * * *

Transcriber's Notes:

C (X) and C(X) standardized to C(X).

usec and usec. standardized to usec. throughout text.

Other changes to the original text are listed below.

Figure 4 is referred to in the text, but a copy could not be located.

Underlined Text is enclosed by underscores.

Superscripts are marked with carats x^2 and y^{-3}.

Greek symbols are surrounded by ~tildes~.

Transcriber Changes:

TABLE OF CONTENTS: Originally 'Operation' (=Operating= Speeds)

TABLE OF CONTENTS: Originally 'Frap' (=FRAP=)

TABLE OF CONTENTS: Originally 'Routines' (=Subroutines=)

Page 4: Originally 'theoperate' (while a program is operating by means
of =the operate= instruction.)

Page 7: Added comma (The instruction base address, =Y,= is in octal
digits 7 through 11.)

Page 8: Standardized from 'sub-routines' (The conversion of decimal
numbers into the binary system for use by the machine may be
performed automatically by =subroutines=.)

Page 8: Standardized from 'sub-routine' (the output conversion of
binary numbers into decimals is done by =subroutine=.)

Page 16: Added comma (This instruction will shift the contents of the
combined register right N =positions,= where N is octal digits
7-11 of the instruction word.)

Page 16: Moved comma. Was 'left, N positions' (This instruction will
shift the contents of the combined registers =left N positions,=
where N is octal digits 7-11 of the instruction word.)

Page 19: Was 'know' (Most in-out operations require a =known= minimum
time before completion.)

Page 20: Removed inconsistent comma (These are the Test Address (15
bit