SM 50/40

SM 50/40 Also called MVS 80,CM 1625,CM 1625.1601.It was manufactured from 1982 to 1988 by ZVT B.Bystrica. The computer was inspired by or was successor to iSBC 80. Hardware is based on MHB8080A.Operating systems running on the computer: MIKROS,DOS MVS,LOS MVS.

This topic contains doubts or inaccuracies that need to be corrected. More information follows below.

Parts of this topic may be machine translated.

Contents
Base system from the family of 8 and 16 bit SMEP series II modular microcomputers with the I-41 bus in Czechoslovakia. The basis of the system was developed at the Research Institute of Computer Technology in Žilina in 1980 and was supplied from ZVT Banská Bystrica from 1982 either as a kit of fitted and revived module boards in the format of 2/3 SMEP boards, or as a cassette with built-in power supplies and ventilation for 8 standard 2/3 SMEP boards with connectors and split I-41 bus with installed boards, or in 19" grid with built-in power supplies and ventilation, which could be built into 19" SMEP racks, or other standard 19" racks according to IEEE for electronic devices.

The system was gradually developed and supplemented in the following years. The SM 50/40-1 microcomputer system is designed especially for machine control. devices and equipment, in the form of a terminal station for collecting and pre-processing information and in the form of a MVS 80 Microcomputer Development System for application development.

The CM 1601 terminal connected to the system

Hardware

Made 128 pcs

The processor board is designated SM 2138. The single-board microcomputer SM 50/40-1 contains a basic 8080 microprocessor, I-41 bus control in an 8-bit version and an 8-level interrupt system that allows addressing of the operating memory up to 64 KB. It also contains a built-in RAM with a capacity of 2 KB and 4 KB EPROM, one IRPS or S2 serial transmission channel, 48 TTL input-output lines, for example to implement 4 parallel IRPR input-output channels, and a timer.

Memory Modules

Peripheral Device Controllers

It uses a dual-board FDD controller based on the MH3000 architecture.

Communication Modules

Modules of interaction with the technological process

Design Microcomputer Development System (MVS 80)

The development system MVS 80 was produced in two versions.

In both cases, the design of the terminal station was based on a built-in cartridge for 8 standard 2/3 SMEP boards. In addition to the boards of the CM 1601 video terminal, the processor boards, 64 KB memory, RJ external memory on a flexible disk or the control boards of the non-standard PZ emulator MVE 80 and control board of the PGM 08 type PROM/EPROM memory programmer.

MVS 80-I

The first MVS 80-I was oriented around a punched tape sensor and puncher and used punched tape as the storage medium.

The MVS 80-I development system ran under the LOS MVS 80 punched tape operating system.

MVS 80-II

The second MVS 80-II – used a floppy disk as a storage medium and used a floppy disk-based memory as an external memory.

The MVS 80-II development system worked under the DOS MVS 80 disk operating system, which also supported the work and the PGM 08 PROM/EPROM memory programmer. Macro assembler and BASIC translators were also available, for DOS MVS 80 also PL/M 80, FORTRAN 80 and PASCAL 80

Processor replacement for Z80 in SMS / SM-50/40

The connection diagram of the processor with Z80 for MVS SM50/40-1 (Ing. Stanislav Černý, c.ú.o. ORGREZ Brno) has survived.

Computer Usage

Industry - aerated concrete production

The solution for controlling the technological nodes of the aerated concrete production was designed according to the then modern principles of the design of microcomputer systems. The goal was to improve the quality of management of technological operations and final products, to reduce the consumption of raw materials and energy, as well as to optimize the process of storage, dispatch and unloading of products based on the order plan. The control system included the following key production nodes:

The system was distributed, which meant that the individual functions of the control system were spatially distributed near the respective technological devices. This solution minimized delays in data transmission and processing.

Two microcomputers SM 50/40-1, one SAPI-1 and one SM 50/50-1 were used to implement the system. Each of these microcomputers functioned as an autonomous unit that implemented control algorithms for specific nodes and shared the necessary data with other units.

The first SM 50/40-1 microcomputer

This microcomputer was used to control the raw material mill, the mixing and casting process, the cutting unit and the electrical power distribution. It also implemented communication with the slave computer SAPI-1. In the mill, he ensured the control of the dosage of raw materials based on the chemical composition of the mixture, the control of the operation of the mill and the reliability of its operation. At the mixing node, he managed the dosing of components into the mixer, calculation of the recipe, monitoring of the mixing process and casting of the mixture into molds. The slicing node included operating the mass height meter and monitoring the parameters of the sliced ​​blocks. In the field of electricity, the system monitored the consumption of customers in the plant and optimized consumption according to agreed schemes.

The first microcomputer included two DIO modules, an AAC converter module and a multiplexer, and was equipped with 16 KB of RAM and 32 KB of EPROM. Two video terminals and a mosaic printer Consul C 2111 were used for communication.

Slave microcomputer SAPI-1

The SAPI-1 microcomputer was plugged in to handle additional tasks, such as system-wide real-time synchronization, operating the technological keyboard, display units, and other devices. It communicated with the host microcomputer via parallel transmission via 8-bit ports.

The second microcomputer SM 50/40-1

The second microcomputer focused on controlling the autoclave station and steam release. The system allowed the control of autoclave cycling including the use of the maximum amount of steam without affecting performance. It contained similar equipment to the first microcomputer, including a video terminal connected via the SM 2150 module.

Software

Both microcomputers used the ERČ 80 operating system and worked in multitasking mode. The system part of the program included the management of communication with additional devices, while the technological part implemented control algorithms for individual nodes. The programs were structured into modules, some of which had a more general character and could be used in other applications.

For communication between the system and the operator, the FORMATER tool was created, which ensured the input and output of data on various devices. This tool made it possible to interrupt communication with warning messages and then resume it.

Inaccuracies/doubts related to the topic

It is most likely a copy of the iSBC80/20

Computers derived from SM 50/40

The following computers were inspired by or derived from SM 50/40:

References

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