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All Projects → jakubfi → em400

jakubfi / em400

Licence: GPL-2.0 license
MERA 400 emulator

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About em400

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

Requirements

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)

Build instructions

Do the following in the source directory:

mkdir build
cd build
cmake ..
make
make install

Running

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
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