I know this is an old thread, just in case this has not be resolved yet and someone out there is interested, I have come across some code for the BetaBrite Prism (USB) display that could be intergrated into the Plug-in for MaLa.
http://www.industrologic.com/prissoft.htmTake a look at the example PRISMMES.BAS to see how to talk to the display. The key is betabriteusb.dll, which is a talks to the BulkUSB driver. The DLL exposes a few simple methods such as USBBULK_Open, USBBULK_Close, USBBULK_Write, which is all that is needed to talk to the Prism.
The protocol is the same as for the BetaBrite Classic (RS-232) displays. I have successfully written a small application that sends files from
Silverfoxy's LCDGen to the display. The only problem with these files is that the message format used there cause a 3 second delay from when the data is sent to when the display shows it. According the PRISMMES.BAS example, this can be overcome by sending a somewhat more complicated message with an embedded string file. Perhaps Silverfoxy can update his software to incorporate that.