RZMark

RZMark is a markup language created for use in the ZX Spectrum computer, a home computer model produced by Sinclair Research in the 1980s. The language was designed by Peterborough teenager Chris Smith, who went on to release a number of other software titles for the ZX Spectrum, often under the pseudonym "Exidy".

RZMark was developed in 1982 as a response to the lack of options for formatting text in the ZX Printer, a commercial peripheral which was capable of printing graphics, as well as text. At the time, the ZX Printer was unable to print formatted text files produced by other programmers using other mark-up languages, a situation that RZMark aimed to address.

The language features a set of instructions for formatting and positioning individual characters on the page, allowing users to print pages of high quality text. It includes graphics capabilities, as well as the ability to handle programming examples, thanks in part to the inclusion of Profession (ASCII and graphic characters included on attributes), Rot sensors) signs of usage - receipts of functionality as ReSet checking statistics.