providing extra storage this modification also allowed some games and applications intended for the BBC Micro to function on the Electron despite the lack of a native Mode 7. Applications could not directly address video memory in shadow mode without modification, so it was incompatible with most games, although there is no inherent reason why a game could not be written to function in shadow mode. A switch mounted through the case switched between normal, turbo and shadow modes. Towards the end of the Electron's commercial lifetime, the Turbo-Driver and Master RAM Boards were offered already fitted to new Electrons in an attempt to increase sales. For a time, Jafa Systems manufactured their own equivalent of the Master RAM Board in order to support their own product range. Mode 7 display expansions One of the features of the BBC Micro that was absent in the Electron was the Teletext-style Mode 7 display. The omission of this display mode was remarkable because it had a very low memory requirement (just 1000 bytes) and many BBC programs used it to maximise available memory for program code and data while also providing a colourful 40-column textual display with simple low-resolution graphical decorations. Such display capabilities, desirable in their own right on low-memory computers, were also desirable for delivering content through low-bandwidth communications channels such as that from Teletext and Viewdata services. However, access to such services can be considered to be a separate capability, and the BBC Micro needed to be upgraded to complement its display capability with the Teletext or Prestel adapters to receive such over-the-air or online content. Jafa Systems provided a number of solutions to remedy the absence of a Teletext display capability. Morley Electronics instead chose to offer an expansion combining the display and reception capabilities. Sir Computers In late 1984, Sir Computers announced a Mode 7 adapter unit that plugged into the Electron's expansion connector. Unfortunately, Sir Computers ceased trading before the product was brought to market. Jafa Systems Released in 1987 at a price of £89, the Mode 7 Mark 1 Display Unit was a separate unit "about the size, shape and colour of the Plus One or a Slogger ROMbox" that connected to the Electron's expansion connector and featured a Motorola 6845 display controller and Mullard SAA5050 character generator to replicate the main elements of the BBC Micro's Teletext display solution. This only used 1 KB