Editing Acorn Electron (section)

====Jafa Systems RS423 cartridge====
Jafa Systems announced an RS423 cartridge in late 1989 to "fill a two year gap in the market", offering a serial connector compatible with the BBC Micro together with an on-board socket for 8&nbsp;KB or 16&nbsp;KB EPROM devices or for 32&nbsp;KB RAM, the latter being configured to present two sideways RAM banks to the system. Write protect functionality was supported to prevent certain ROM software from attempting to overwrite itself if stored in RAM. The cartridge board itself was priced at around £30, with a case costing £5 extra, and an optional 32&nbsp;KB RAM adding another £20. Support for the E00 ADFS offered by PRES for that company's AP3 disc system was indicated as an application for the sideways RAM.<ref name="electronuser198911">{{ cite magazine | url=https://archive.org/details/ElectronUserVolume7/Electron-User-07-02/page/n5/mode/1up | title=Add-ons boost for Electron | magazine=Electron User | volume=7 | issue=2 | date=November 1989 | access-date=21 January 2021 | page=6 }}</ref>