JPR-8
Also called SAPI.Designed by Ing. Eduard Smutný.It was manufactured from 1976 by Tesla Elstroj.
JPR-8 is a SAPI file processing unit, simpler than JPR-12.
Determination
The JPR8 unit is the second type of control unit of the SAPI system, where it fulfills the function of a small control computer, especially for those cases that require the program control of several additional devices according to a fixed program and where the deployment of the JPR 12 unit would be uneconomical.
Description JPR-8
The JPR-8 program control unit is a 16-bit dual-address computer with a fixed word length. It contains EAROM thin-film memory and ferrite memory. The EAROM memory serves only as a read-only program memory, and its fixed program handles the operation of additional devices. The program is recorded in a device (PRZ), which is not part of the JPR8 unit. The thin layer memory has a capacity of 512 words / 16 bits. Ferrite memory serves as data memory. It has a capacity of 256 words / 8 bits. the memory is of the 3D coincidence type.
Arithmetic Logic Unit (ALJ)
This unit is used to perform arithmetic and logical operations. Its basic part is the adder. The required ALJ function is set by the controller using control inputs. The output of the adder is connected via a modifier to 16 RRAM registers, to the B register, to the RI (instruction) register and to the BA address register. The output of the adder is connected to the S-bus, to which thin-film memory, ferrite memory and additional devices are connected via the ASB adapter board. This arrangement enables simple rewriting of memory contents to registers, from registers to memory, from additional devices to registers, etc. The signals that control these rewrites are generated by the controller.
ALJ Master Registers
- a) 16 12-bit RRAM registers
- b) B register 12 bits
- c) RI-instruction register 12 bits
- d) BA-address register 12 bits
- e) 4 registers C, N, Z, T 1 bit