ES PEVM
ES PEVM was a Soviet clone of the IBM PC in the 1980s. The ES PEVM models lineup also included analogues of IBM PC XT, IBM PC AT, IBM XT/370.
The computers and software were adapted in Minsk, Belarus, at the Scientific Research Institute of Electronic Computer Machines.
They were manufactured in Minsk as well, at Minsk Production Group for Computing Machinery.
Description
The first models of ES PEVM, unlike the IBM PC, had two units: a system unit and a floppy drives unit. These models used a backplane instead of the main board. Although the system bus was compatible with ISA bus, it used a different type of connector, so the IBM PC expansion cards could not be installed in ES PEVM.Later models were fully-compatible with IBM PC XT and IBM PC AT.
Unlike IBM PC using the Intel 8088 processor, the early ES PEVM models used K1810VM86 processor with a 16-bit bus and a clock frequency of 5 MHz. The processor was placed on a separate board. Early versions of the board did not have a socket for the floating point coprocessor.
The following boards were produced for ES-1840 and ES-1841:
- CPU board. It was installed in every configuration of the computer.
- 128 KiB RAM board. It was installed in early models of ES PEVM.
- 512 KiB RAM board. Variants with 256 KiB or 128 Kib were available.
- MDA adapter board. It was built using the Bulgarian CM607 chip.
- CGA adapter board.
- Floppy drive adapter board. It was built using the Bulgarian CM609 chip.
- Serial interface adapter board. It was electrically incompatible with the IBM PC COM port and was not supported in the BIOS.
| Model name | Year of production start | Year of production end | Volume of production |
| ES-1831 | 1986 | ||
| ES-1832 | 1986 | ||
| ES-1834 | 1986 | 1989 | 13799 |
| ES-1835 | 1989 | ||
| ES-1838 | 1988 | ||
| ES-1839 | 1987 | ||
| ES-1840 | 1986 | 1989 | 7461 |
| ES-1841 | 1987 | 1995 | 83937 |
| ES-1842 | 1988 | 1996 | 10193 |
| ES-1843 | 1990 | 1993 | 3012 |
| ES-1845 | 1988 | ||
| ES-1847 | 1988 | ||
| ES-1849 | 1990 | 1997 | 4966 |
| ES-1850 | 1989 | ||
| ES-1851 | 1991 | 1997 | 3142 |
| ES-1855 | 1991 | ||
| ES-1861 | |||
| ES-1862 | |||
| ES-1863 | 1991 | 1997 | 3069 |
| ES-1864 | 1991 | ||
| ES-1865 | 1992 |
Software
The computers were shipped with AlphaDOS, an entirely Russified version of MS-DOS/PC DOS 2.x and 3.x. All commands were entered in Russian, for example,СМЕНКАТ for CHDIR. Files and file extensions were also in Russian, such as АТРИБ.ИСП for ATTRIB.EXE. The operating system used the main code page, hardwired into the display ROM; it was compatible neither with CP 866 nor CP 855, although partially with ISO/IEC 8859-5.