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Ten POKEs That Turn the ZX Spectrum's ROM Against Itself

The film's page has its chapters, every source, the code and the full transcript: Ten POKEs That Turn the ZX Spectrum's ROM Against Itself.

Sources and credits for the film. Every fact in the narration is tied to a quotation from a captured source; every image, clip and piece of music is listed with its licence and where it came from. Archive images and footage are openly licensed. Maps, charts and diagrams were made for this film from the cited sources.

Images and footage (20)

  • A Sinclair ZX Spectrum 48K, rubber keys, photographed from above on white
    Bill Bertram / Wikimedia Commons / CC BY-SA 2.5. CC BY-SA 2.5. Source
  • A Sinclair ZX Spectrum 48K, rubber keys, photographed from above on white
    Bill Bertram / Wikimedia Commons / CC BY-SA 2.5. CC BY-SA 2.5. Source
  • Take-1 from the start-up screen through typing the three lines and RUN to C Nonsense in BASIC, 30:1, stopping before LIST
    Retro Computer TV. Own work.
  • The held result of take-10: IBM on the screen and the shifted report 1!PL-!21;3, held
    Retro Computer TV. Own work.
  • The held result of take-2b: the report messages from Out of memory to the copyright line, ending K Invalid colour, 30:1
    Retro Computer TV. Own work.
  • The held result of take-5: the extended-mode keywords printed from HI, ending K Invalid colour, 10:2
    Retro Computer TV. Own work.
  • The held result of take-6: the black screen of the wiped machine
    Retro Computer TV. Own work.
  • A freshly started 48K ZX Spectrum: 10 POKE 23610,28 typed, then RUN: the program ends with the report T © 1982 Sinclair Research Ltd, 10:1
    Retro Computer TV. Own work.
  • The report line number 8 left on a 48K Spectrum, T (c) 1982 Sinclair Research Ltd, 10:1, above a ZX Spectrum 48K
    Retro Computer TV. Own work.
  • The Spectrum's screen after POKE 23659,1: PRINT "HI": vertical stripes over the whole screen, on a monitor behind a ZX Spectrum 48K
    Retro Computer TV. Own work.
  • A freshly started 48K ZX Spectrum: 10 POKE 23606,8: PRINT "HAL" typed key by key with the key click, then RUN: the screen shows IBM, and the report under it reads 1!PL-!21;3
    Retro Computer TV. Own work.
  • A freshly started 48K ZX Spectrum: 10 POKE 23614,100 and 20 GO TO 20 typed, then RUN; a second later BREAK (CAPS SHIFT and SPACE) is pressed and the machine restarts at its start-up screen, the program gone
    Retro Computer TV. Own work.
  • A freshly started 48K ZX Spectrum: 10 POKE 23610,28 typed, then RUN: the program ends with the report T © 1982 Sinclair Research Ltd, 10:1
    Retro Computer TV. Own work.
  • A freshly started 48K ZX Spectrum: 10 POKE 23681,64: LPRINT "HELLO SPECTRUM"; typed (LPRINT in extended mode), then RUN: rows of dots across the top pixel lines of the first eight text rows, then 0 OK, 10:2
    Retro Computer TV. Own work.
  • A freshly started 48K ZX Spectrum: 10 POKE 23659,1: PRINT "HI" typed, then RUN: vertical black and white stripes over the whole screen, then 0 OK, 10:2
    Retro Computer TV. Own work.
  • A freshly started 48K ZX Spectrum: 10 POKE 23659,0: PRINT "BYE" typed, then RUN: the screen goes black and the machine stops responding
    Retro Computer TV. Own work.
  • A freshly started 48K ZX Spectrum: 10 POKE 23650,39: PRINT "HI" typed, then RUN: the screen fills with the extended-mode keyword table and the keyboard map, ending K Invalid colour, 10:2
    Retro Computer TV. Own work.
  • A freshly started 48K ZX Spectrum: 10 LET b$="CAT", 20 POKE 23564,19 and 30 PRINT b$ typed, then RUN: the error messages print from Out of memory onwards, each last letter as a keyword, to the copyright line, ending K Invalid colour, 30:1
    Retro Computer TV. Own work.
  • A freshly started 48K ZX Spectrum: 10 POKE 23740,20: PRINT "HI" typed, then RUN: the program listing appears instead of HI, with a second line 10 holding RUN
    Retro Computer TV. Own work.
  • A freshly started 48K ZX Spectrum: 10 POKE 23745,56, 20 PRINT "A"+STR$ 5 and 30 PRINT "END" typed (STR$ in extended mode), then RUN: A, then C Nonsense in BASIC, 30:1; then LIST shows line 30 changed
    Retro Computer TV. Own work.

Music (15)

Sources (49)