EM400 is an emulator of Polish MERA-400 minicomputer system (built in late '70 and popular in the '80). Learn more at: http://mera400.pl

Project is still in development state, but most of the emulation works fine and EM400 can run original MERA-400 software.

Emulation features:

• MERA-400 CPU
• MX-16 CPU (original CPU with modifications)
• floating point arithmetics
• Elwro memory (32kword modules, ferromagnetic)
• Amepol MEGA memory (64kword modules, semiconductor)
• character channel (character-oriented I/O interface)
• memory channel (block-oriented I/O interface)
• Amepol MULTIX peripherial processor
• Winchester disk drive
• TCP terminal
• built-in debugger

Things that are still waiting for implementation:

• MERA 9425 disk drive
• Terminals (serial, console)
• 5.25" floppy disk drive
• Amepol real time clock

Things that may or may not be implemented:

• Amepol PLIX peripherial processor
• EC 6051 disk drive
• PT-305 tape drive

To build and run em400 you'll need:

• cmake
• GNU make
• bison and flex
• libemdas
• libemcrk
• libemawp
• ncurses (used by debugger)
• readline (used by debugger)

Do the following in the source directory:

mkdir build
cd build
cmake ..
make
make install

Emulator is by default built with debugger, which currently is its primary (and only) user interface.

Usage:

em400 [option] ...

Where options are:

• -h - display help
• -c config - use given config file instead of default one (~/.em400/em400.cfg)
• -p program - load program image into OS memory
• -l levels - enable logging with given levels. Syntax for describing levels is: component=level[,component=level[,..]]. Available components are: reg, mem, cpu, op, int, io, mx, px, cchar, cmem, term, wnch, flop, pnch, pnrd, crk5, em4h, all. Logging level is 0-9.
• -L - disable logging
• -k value - set keys to given value

Debuger-only options:

• -s - use simple debugger interface