ZX81 character set - definition. What is ZX81 character set
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ZX81 character set         
  • ZX81 8K BASIC]] program that demonstrates all code points including BASIC keywords and nonprintable characters, rendered as question marks.
NON-STANDARD CHARACTER ENCODING USED IN THE SINCLAIR ZX81 COMPUTERS
The ZX81 character set is the character encoding used by the Sinclair Research ZX81 family of microcomputers including the Timex Sinclair 1000 and Timex Sinclair 1500. The encoding uses one byte per character for 256 code points.
Variable-width encoding         
TYPE OF CHARACTER ENCODING SCHEME
Variable width encoding; Multi-byte character set; Variable-width; Multi-Byte Character Set; Multibyte character; Multi-byte character; Multibyte character set; Multi Byte Character Set; Multi-byte Character Set; MBCS (encoding); Multi byte character set; MB (character set); Multiple-byte character set; Multiple-Byte Character Set; Multiple Byte Character Set; Multiple-byte Character Set; Multiple byte character set; Multiple-byte character; Mixed Multi-Byte Character Set; PCMB (encoding); Mixed Multi-byte Character Set; Mixed multi-byte character set; Mixed multi byte character set; Mixed Multi Byte Character Set; Mixed Multiple-Byte Character Set; Mixed Multiple-byte Character Set; Mixed multiple-byte character set; Mixed Multiple Byte Character Set; Mixed multiple byte character set
A variable-width encoding is a type of character encoding scheme in which codes of differing lengths are used to encode a character set (a repertoire of symbols) for representation, usually in a computer. Most common variable-width encodings are multibyte encodings, which use varying numbers of bytes (octets) to encode different characters.
ZX-81         
  • Beocomp ZX81
  • The TK85, an unauthorised ZX81 clone produced by Microdigital Eletronica of Brazil.
  • alt=A black rectangular calculator being held in a person's right hand.
  • The Science of Cambridge MK14 (1978), sold in kit form, was Sinclair's first computer.
  • Sinclair ZX81 PCB Revision 3 Bottom Side
  • Sinclair ZX81 PCB Revision 3 keyboard
  • Revised Sinclair ZX81 PCB Revision 3 Top Side
  • alt=ZX81 in between a copy of the "ZX81 BASIC Programming" manual and a cassette tape recorder, with a black-and-white Ferguson TV set on the background.
  • The Timex Sinclair 1000, a licensed ZX81 variant produced for the US market by Timex in 1982–83. It was initially highly successful but sales soon collapsed.
  • alt=View of the ZX80, a white rectangular computer with a black keyboard with blue keys and the words "SINCLAIR ZX80" on the centre left of the case, in front of a large bulge at the rear of the machine.
  • Closeup view of the 16K RAM module, showing its edge connector
  • alt=ZX81 computer with a 16 KB RAM pack and a ZX Printer attached.
  • alt=Two views of the ZX81, one showing the left side with four sockets marked "TV", "EAR", "MIC" and "9V DC" respectively, and one showing the rear with the edge of the circuit board visible through a gap in the case.
  • alt=Top-down view of the ZX81 motherboard showing the layout of the components. Four chips are prominent, along with a TV modulator on the top left and a ribbon cable on the bottom right.
  • alt=A two-page advertising spread showing the ZX81 with a 16 KB RAM pack and ZX Printer attached, next to the headline "Sinclair ZX81 Personal Computer – the heart of a system that grows with you"
  • alt=Sketch of two concept designs for the ZX81, showing the computer with a series of similarly shaped boxes stacked behind it in a row.
  • alt=The component parts of the ZX81, including the case, keyboard and circuitry, resting on a blue sheet in front of the cardboard box in which it was shipped.
  • Many ZX81 owners replaced the machine's touch-sensitive keyboard with more usable add-on keyboards produced by third-party suppliers.
HOME COMPUTER PRODUCED BY SINCLAIR RESEARCH
Zx81; Sinclair ZX-81; Timex Sinclair 2040; Zx-81; ZX-81; Sinclair ZX81
<computer> An even more successful version of the Sinclair ZX-80, featuring a large uncommitted logic array instead of much discrete logic, an improved BASIC, and rather more expandability (it could take 16kb RAM packs). It was launched around 1981 and was eventually replaced by the Spectrum. (1995-11-04)