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 In its current state, EM400 can run original MERA-400 software.
Emulation features:
- MERA-400 CPU
- MX-16 CPU (original CPU with modifications)
- real CPU speed
- floating point arithmetic
- Elwro memory (32kword modules, ferromagnetic)
- Amepol MEGA memory (64kword modules, semiconductor)
- character channel (character-oriented I/O interface)
- Amepol MULTIX peripherial processor
- Winchester disk drive
- terminal connection over TCP or serial line
- built-in debugger
Things that are still waiting for implementation:
- 8" floppy disk drive (partially implemented)
- memory channel and MERA 9425 disk drive
- Terminals connected to MULTIX peripherial processor
- 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 (deassembler library)
- libemcrk (CROOK memory structures)
- libemawp (floating point arithmetic)
- ncurses (used by debugger)
- readline (used by debugger)
Do the following in the source directory:
mkdir build
cd build
cmake ..
make
make install
EM400 is built with a debugger which currently is its primary user interface.
Usage:
em400 [option] ...
Where options are:
- -h - Display help
- -c config - Config file to use instead of the default one (~/.em400/em400.cfg)
- -p program - Load program image into OS memory at address 0
- -l component,component,... - Enable logging for specified components. Available components: reg, mem, cpu, op, int, io, mx, px, cchar, cmem, term, wnch, flop, pnch, pnrd, crk5, em4h, all.
- -L - Disable logging
- -k value - Value to initially set keys to
- -u ui - User interface to use. Available UIs: curses (default), cmd (minimal, for remote control)
- -F - Use FPGA implementation of the CPU and external memory (experimental)
- -O sec:key=value : Override configuration entry "key" in section [sec] with a specific value