From London Hackspace Wiki
Revision as of 20:37, 18 September 2014 by YOPERO (talk | contribs)
Jump to: navigation, search


Hacking Interfacing the Boxford 190VMC


Long ago this CNC was controlled by a BBC Master from Acorn.

I just found a disk with the software used to control the Boxford 125 tcl lathe that happens to have a very similar electronic board as the 190VMC. To emulate the BBC master on a Windows7 sytem I have used "BeebEm 414"---> and the disk can be downloaded from here:

It could be a starting point for decoding the initial handshake to control the drivers. The documentation suggests that it uses standard gcode (ISO)--->

Yesterday I was able to connect to the cnc via serial(b:9600 d:8 s:1 p:none) and get its model but could find any code that actually moves the motors.


DataSheets for the existig electronics

  • DS80C310 High-Speed Microcontroller, driving each motor:

  • Lense Speed controllers 530 series Spindle:


  • microstepping

  • Serial cabling db25 and db9

[[parallel_port_pinout.jpg ]]

The cnc sends 5 blocks of 7 chars, the structure as follows:

P000000// Z axis
p000000// feed rate
 s 0000// spindle rpm
00000E5// X axis
@000000// Y axis

Null modem cable with loop back handshaking does not make any difference when sending regular GCode