This is the latest for braille production. The perkins is the main brailler in use, itÕs a purely mechanical ÒtypewriterÓ designed in the 40s and production started in the 50s. Basically unchanged. It weighs in at about 6kilos, imagine a grade one child trying to lug this around school. Mountbatten made the mistake of attempting to be all things to everyone. Stores docs in static ram so very limited  space, old 8 bit processor slow, power hungry and unreliable, I know I used to fix them. Huge lead acid battery so very heavy and noisy. Multiple Òblack boxesÓ hang off to connect printers and peripherals.. Jotadot is a new manual device.