The Virtual Motherboard Homepage

The Virtual Motherboard is hosted under sourceforge (see: http://sourceforge.net/projects/vmb/). There you can get source code and browse the CVS repository. Here you find a selection of ready to run binary examples.

Example 1

A simple configuration running under Linux consisting of

Virtual Motherboard.
MMIX CPU
ROM, including the rom image and the MMIX source files for the image
RAM
Screen
Keyboard
A sample hello world program, written in MMIX assembler.
The mmix assembler (mmixal) and a tool to produce a boot image from an mmix object file (mmoboot).
A README file.
The configuration file (default.mmc).
A tgz file containing all of the above.

Example 2

A simple configuration running under Linux consisting of

Virtual Motherboard.
MMIX CPU
ROM, including the rom image and the MMIX source files for the image
RAM
Two Framebuffer devices, one written in Java the other in C (for X11).
A sample program lorenz.mms diplaying a lorenz attractor.
The mmix assembler (mmixal) and a tool to produce a boot image from an mmix object file (mmoboot).
A README file.
The configuration file (default.mmc).
A tgz file containing all of the above.

Example 3

The same as Example 1, but with executables for WIN32. (screenshot)

Example 4

The same as Example 2, but with executables for WIN32.

Example 5

This example demonstrates a simple embedded device, a stopwatch. There is no RAM (everything works in registers, no user program, just a program in ROM.

The example uses the GNU toolchain under windows to build the system.

start it by double-clicking the motherboard. You will get the motherboard, ROM (no RAM needed for this), a MMIX CPU in a console window, a black, a green, and a red button, a timer, and a seven-segment display. Arrange them on the screen as needed. At the first run all items are located at position 0x0, but they remember new positions...
Power the system on using the power button on the motherboard.
Pressing the green button sends an interrupt and the CPU will switch on the timer.
A Timer interrupt will come every 1/10th of a second.
The CPU will update the display on receiving a timer interrupt.
Pressing the red button will stop up the timer.
Pressing the black button, will reset the counter to zero.

Example 7

This example demonstrates the framebuffer device, buttons and timer.

The program runs the "Game of Live"
start it by double-clicking the motherboard. You will get the motherboard, RAM, ROM, am MMIX CPU in a console window, a black, green, and red button, a timer, and a frame buffer device. Arrange them on the screen as needed. At the first run all items are located at position 0x0, but they remember new positions...
When power is on the CPU starts, and initializes the screen.
Pressing the green button sends an interrupt and the CPU will advance to the next generation.
Pressing the red button will set up the timer, to send interrupts, advancing to the next generation automatically.
Pressing the black button, will terminate the Game of Life program. And the CPU returns to the operating systems idle loop.
Press the rest button on the motherboard to start over.

It sould be possible to write a program that starts with zero counting the seconds and displaying the number of seconds elapsed on the seven segment display.

Example GNU

A complex example demonstrating the GNU toolchain with MMIX.