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Which clippings match 'ZX81' keyword pg.1 of 1
16 MARCH 2016

British television series 'Database': How to send an 'E mail' in 1984

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TAGS

1980s1984BBC MicroBritish television seriesCommodore 64 • Commodore VIC-20 • computer agecomputer historycomputing history • Database (TV series 1984) • Dragon 32 • Dragon 64 • early adopterearly computer-eraforerunnerhome computerinformation ageInternet • Jane Ashton • Julian Green • Micronet • modem • online server • Pat Green • personal computerprecursor technology • press telephone • Prestel • Prestel MicroComputing • rotary telephone • telecommunicationstelephonetelevisionThames TelevisionTV seriesUK • UK Post Office • VIC-20 • Videotex • Viewdata technology • ZX SpectrumZX81

CONTRIBUTOR

Simon Perkins
03 DECEMBER 2012

Sinclair ZX81: semigraphical / pseudographical characters

"If you press GRAPHICS (shifted 9) then the cursor will come up as : this means graphics mode. If you type in a symbol it will appear in its inverse video form, & this will go on until you press GRAPHICS again or NEWLINE. RUBOUT will have its usual meaning. Be careful not to lose the cursor  amongst all the inverse video characters you've just typed in. ...

Right at the beginning are space & ten patterns of black, white & grey blobs; further on there are eleven more. These are called the graphics symbols & are used for drawing pictures. You can enter these from the keyboard, using graphics mode (except for space, which is an ordinary symbol using the  cursor; the black square is inverse space). You use the 20 keys that have graphics symbols written on them. For instance, suppose you want the symbol , which is on the T key. Press GRAPHICS to get the  cursor, & then press shifted T. From the previous description of the graphics mode, you would expect to get an inverse video symbol; but shifted T is normally <>, a token, & tokens have no inverses: so you get the graphics symbol  instead."

(Steven Vickers, 1981, Sinclair Research Limited)

Fig.1 "graphics mode" table from Steven Vickers (1981). "Sinclair ZX81 BASIC Programming", Second Edition 1981, Copyright 1980 Sinclair Research Limited (converted to HTML by Robin Stuart).

2). Matthew Eagles (2008). "ZX81 VDU" TrueType font which replicates the letters, numbers etc. displayed on the screen of the ZX81.

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TAGS

1980s19818-bitbasic geometric shapesblack and white • block graphics • computer historygeometric figuresgeometric shapes • graphic symbols • graphical building block • graphics mode • history of computinghome computerindustrial archaeologymanualmonotone • PETSCII • pictorial systemspixel matrix • pseudographics • semigraphical characters • semigraphics • Sinclair Research Ltd • Sinclair ZX80 • Sinclair ZX81 • sixels • symbolsymbolstypefacevintage technologyvisualisationZX81

CONTRIBUTOR

Simon Perkins
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