Project:RELaserSoftware

Reverse Engineering Laser Software

The laser software is bad, we need to know about the file that is created by it so we can create our own in some fashion. Also if it does anything fancy when it downloads itself via USB.

Background

The software is available here. Please scan this with antivirus software before use.

There is a special patched version that cannot currently (but hopefully one day) will be useful for exploring .mol files on babbage in EB4890's folder.

• Manual for the MPC6515 controller (uses Modbus over serial)

Note that this says there's software bounds protection with firmware versions 4.1.0.0 or above (once origin is set)

• Firmware for MPC6515 controller (and LaserCut software again)

the above, translated by google

• A commercial printer driver compatible with the MPC6515

Initial Analysis of .mol file

Looking at: /Solexious/MarioBoxes/MINIMARIO.MOL

No ASCII strings (looking using strings)

Does not appear to be compressed (too many zeroes)

• 0x000 : Header
• 0x200 : One set of information What?
• 0x400 : Another set of information.
• 0xa10 : Likely co-ordinate data. Quite repetitive. Analysis document was mario boxes, with many repetitions of sub boxes, so that makes sense. It looks like possible 16bit number co-oords as the numbers range from a few thousands to hundreds. 32bits are in unrealistic ranges (huge in negative ranges).

To Do

Create simple .mol files with slight changes in

• One co-ordinate of a point
• The colour of one line
• The speed of one colour
• The power of one colour

And find diffs.

USB

Vendor: 0548 Product: 1005

The protocol seems to be fairly simple. I have a capture of some file downloads and deleting a file.

looks like:

commands are sent to endpoint 0x04 and read form 0x88, sent commands are (byte)length and then length bytes

commands 5 and 6 seem to be start and end

example command block:

>w04 0002     00000000: 01 05
*r88 0001     00000000: 04
>w04 0006     00000000: 05 01 01 83 01 7a
*r88 0001     00000000: 06
*r88 0001     00000000: 05
>w04 0002     00000000: 01 04
*r88 0014     00000000: 0f 01 83 53 51 55 41 52 45 20 20 4d 4f 4c 00 0e
    00000010: 00 00 00 66
>w04 0002     00000000: 01 06

That last reply packet includes the ascii for 'SQUARE MOL' with two spaces in the middle to pad it to 11 characters. This must be a file name in DOS 8.3 format with the . implied between the 8th and 9th characters.

This presumably maps directly to a FAT16 entry, so don't let it be null or begin with a dot!

Random Links that may be useful

• http://www.solustan.com/linkmotion_and_leetro.php
• http://www.rabbitlaserusa.com/DriverDisk/MPC03/MPC03LV3030/MPC03-LV%203.0.3.0/
• http://www.rabbitlaserusa.com/0/