NAIRI
“NAIRI” is the family of electronic digital computers
of general purpose with a microprogram principle of construction and a built-in system of
selfprogramming. They are intended for solution of a wide range of engineering, scientific
and technical, and also some other types of the economical and discont-statistical tasks.
They are developed in the Yerevan research institute of mathematical machines. The family
“NAIRI” includes machines: “NAIRI-1” (the development it is completed in 1964) and
modification “NAIRI-̀” (1965), “NAIRI-S” (1967), “NAIRI-2” (1967) and its
modifications made on discrete semiconducting units; “NAIRI-Ç” (look of the figure),
developed in 1970, with the modification “NAIRI-3-1” on integrated hybrid chips. The
models me rotioneddiffer by the element base, wolums of the operating STORAGE (1 kilobyte
-16 kilobyte of words), the amount and the structure of the peripherals
(input-output from punched cards, alphanumeric printing, external STORAGE, remote
consoles).
Digital computers of the family “NAIRI” use filed ROM of the
large volume on ferrite cores for storage of the subroutine library and RAM of small
capacity for storing the input information and its operating processing. The control unit
is created according to the microprogram principle with the use of a definite part of ROM
for storage of the microprograms, the arithmetic device (AU) is constructed on one
universal register - summator with the fixed cells of the RAM heving as the auxiliary
registers of AU. Both the principle of parallel operationmand methods of
construction and of organizations of structures incorporated in “NAIRI”, allow easily
to rebuild machines according to the requirements arising during the service, to make
effective microprogram diagnostic tests, economically and easiby to realize the means
providing connection between the man and of the machine (the built-in system of
automated programming; flexible and universal mashine language close to usual
mathematical) one to store in cartridges of ROM the programs frequently met tasks and to
execute them without preliminary preparation, and also to store programs of the new tasks
which are not included in structure mathematical supports of the machine, commutated in
additional cartridges of ROM, that allows to expand the library of programs.
“NAIRI-3” represents a new stage in development of
small national machines “NAIRI” using hybrid chips. This machine is constructed
by the agregate-block principle. The new principle of organization of microprogram control
in it has ensured a high density of storage of the large scale arrays of the microcommands
(up to 120 thousands), significant decrease of step time of the machine, simplification of
representing microprograms and decrease of the volume of the necessary information for
their representation, use of common ROM to store the microprograms and programs at a
variable memory allocation between them, possibility of storage of the microprograms in
the RAM, and also use of the microprograms as procedures. A configuration “NAIRI-3-1”,
and also incorporated in the structure “NAIRI-3” hardware allow to carry out
program compatibility it with other Digital computers (for example, “Minsk - 22”,
“Minsk - 22̀”) on the basis of methods of microprogram emulation.
Literature: Ovsepjan G.E., Eilezjan H.K, Oganjan G.A.Some
features of the microprogram principle applied in Digital computers “NAIRI”.
“Problems of radioelectronics. Edition 7. Electronic computer facilities ”, 1966, in.
7; Gorbunov V.I., Kirdan V.S. Electronic computers and analog computers. The reference.
Ê., 1969 [the bibliography page 179-181].