The council of the faculty of Natural Sciences  decided to divide it into the Physics & Mathematics Faculty, and Biology one.  At the Mathematical department of the Physics & Mathematics Faculty, they created three separate departments. Being the Dean of the Physics & Mathematics faculty, P.P. Zabreiko headed the Mathematical Analysis department. Yu.S. Kolesov took charge of the Differential Equations department, and A.Yu. Levin was at the head of the Theoretical Cybernetics one. Levin’s department was responsible for the Discrete Mathematics. At the same time, V.S. Rublev, the Associate Professor of that department, was in charge of the computer division. At the time, they used the computer Odra-1204 where the primary data input-output was punch tape. Besides, such scientists as G.D. Stepanov, V.A. Sokolov, L.S. Kasarin, and  E. A. Timofeev worked at that department. A.V. Zafievsky, the future Dean of the Faculty of Information and Computer Science, was at the de partment of the Mathematical Analysis.

The Faculty of Mathematics council decided to divide the department of Theoretical Cybernetics into the department of Theoretical Cybernetics and the department of Operations Research & Computer Systems. Yu. Mamatov, the Doctor of Engineering Sciences, became the Head of the newly created department.

Classroom No. 218 of the 2nd academic building hosted a council of the Faculty of Mathematics. Notice that those years, the Faculty of Mathematics was in the 2nd academic building, and the 7th academic building did not exist. They decided to create a new division, the Faculty of Information and Computer Science. Being the Vice-Rector for Academic Affairs, Yu. A. Mamatov enlisted the support of V. A. Melnikov, the Academician, and other prominent experts in the field of computer science.
They created the faculty for the support and development of the Yaroslavl scientific center of fundamental problems of Microelectronics and Computer Technology.
V. A. Melnikov placed the original name of the departments of the faculty. He also offered the heads of departments of the faculty:

• Computer Architecture (V. A. Melnikov);
• Applied Informatics (Yu. A. Mamatov);
• System Programming (V. P. Ivannikov);
• Data Processing Systems (G. Yu. Guskov);

 After that, the first two of the sub departments merged into one division named the "Department of Applied Informatics and Computer Architectures" (Yu. A. Mamatov)

The order number 354 on the establishment of the Faculty of Information and Computer Science
The Ministry of Higher Education of the RSFSR issued the order number 354 on the establishment of the Faculty of Informatics and Computer Science. The faculty consists of three departments:

• System Programming under the direction of V. P. Ivannikov, the Corresponding Member of the Academy of Sciences;
• Data processing systems under the leadership of the Corresponding Member of the Academy of Sciences G. Guskov;
• Applied informatics and Computer Architectures, under the leadership of Yuri Mamatov.

 The first dean of the faculty was A. Zafievsky. V.V. Mayorov and A. A. Korotkin were his deputies.
The first admission of students to the faculty was in 1986. It admitted 100 people divided into four groups to the Applied Mathematics major of the Mathematics faculty. The faculty separated them into two halves. One of them formed the Faculty of Informatics and Computer Science, and the other half remained at the Faculty of Mathematics.

The Discrete Analysis department appeared  under the leadership of V. A. Bondarenko.

V. A. Sokolov becomes the Vice-Rector for Academic Affairs instead of Yu. Mamatov.

The academic community founded the Institute of Computer Science of the Academy of Science of the USSR in Yaroslavl based on the Department of Computer Science of the Institute of Microelectronics of the Academy of Sciences of the USSR. The main areas of its activity were as follows:

• development of high-performance multi-processor computer systems;

• research in the field of parallel programming and algorithms; 

• development of the software for high-performance multiprocessor computer systems;

•  development of tools for modeling structures and computing processes in high-performance multiprocessor computers;

• development of the constrictions and technology of high-performance multi-processor computers; 

• basic research in the application of optoelectronic methods in the design of computers; 

• development and operation of computer-aided design (CAD) systems  design and mainframe computers.

The academic community included the Institute of Computer Engineering problems into the Department of Computer Science, Computer Engineering and Automation of the Academy of Sciences of the USSR. They appointed Yu. Mamatov, the Doctor of Engineering Sciences, the organizing director of the Institute of Computer Engineering Problems of the Academy of Sciences of the USSR.

The staff continued to implement the initial idea  of Yu. A. Mamatov. They set goals, developed algorithms, designed and manufactured the appropriate computers. Besides, they created the software for them, and trained the personnel.  Obviously, the "hardware" experts had to be present in this scheme. Unfortunately, 1989 was a year of the beginning of the collapse of the USSR, and it became meaningless to expect investments from the electronics industry. That fact partly explained the change of the major subjects at the faculty. The academic community was looking for a way different from the Faculty of Mathematics.

There was the first unbudgeted  admission of the students to that major subject. Later they transformed that major into the direction of Applied Informatics in Economics.

The faculty named the digest «Modeling and Analysis of Information Systems».

In 1997, students graduated from the Software of Computer Facilities and the Automated Systems department, which was the successor of the newly organized department of the faculty.

Compared with the main major, the greater bias was towards the development of both the theoretical foundations of programming and practice of constructing and operating complex computer systems. In comparison with the previous major subject, the greater emphasis was on technical aspect rather than on economical one.

Later, in 2009, the digest began to appear titled as «Notes on Computer Science and Mathematics».