... the specified colour with that already there m=4 Invert the colour already there The second number (n) defines the <strong>logic</strong>al colour to be used in future. If the n>127 then n defines the graphics background colour. If the ...
Comparison of BASIC Keywords Between ZX Spectrum and the Commodore 64 Overview The following is a list of keywords, operators and delimiters used on the Commodore 64 computer and the ZX Spectrum.The Commodore 64 was released in 1982, the same year as ...
... Color BASIC, Radio Shack/Tandy Corporation (publisher) Notes [1] Due to the way the Dragon/TRS-80 machines make <strong>logic</strong>al comparisons they will always return -1 if true whereas the Spectrum will return +1. This should not be a problem when converting code between machines but should a problem be encountered use ABS result on the ...
... hardware. Later Spectrum designs would introduce further changes to the board layout and integrate more of the <strong>logic</strong> into fewer components. Compatibility One of the most important decisions made with the Spectrum+ was to preserve compatibility with the existing Spectrum software library. The machine remained fundamentally a 48K ...
... examined the operation of the original ULA and showed how its functions could be reproduced using easily obtainable <strong>logic</strong> chips rather than the custom ULA itself. The interest eventually moved beyond home-built projects and into commercial products. The Recreated ZX Spectrum provided a modern recreation of the classic machine, while ...