\documentclass[10pt,a4paper]{article}

% Packages
\usepackage{fancyhdr}           % For header and footer
\usepackage{multicol}           % Allows multicols in tables
\usepackage{tabularx}           % Intelligent column widths
\usepackage{tabulary}           % Used in header and footer
\usepackage{hhline}             % Border under tables
\usepackage{graphicx}           % For images
\usepackage{xcolor}             % For hex colours
%\usepackage[utf8x]{inputenc}    % For unicode character support
\usepackage[T1]{fontenc}        % Without this we get weird character replacements
\usepackage{colortbl}           % For coloured tables
\usepackage{setspace}           % For line height
\usepackage{lastpage}           % Needed for total page number
\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{ingerlm}
\pdfinfo{
  /Title (topic-1-hardware-and-software.pdf)
  /Creator (Cheatography)
  /Author (ingerlm)
  /Subject (Topic 1: Hardware and Software Cheat Sheet)
}

% Lengths and widths
\addtolength{\textwidth}{6cm}
\addtolength{\textheight}{-1cm}
\addtolength{\hoffset}{-3cm}
\addtolength{\voffset}{-2cm}
\setlength{\tabcolsep}{0.2cm} % Space between columns
\setlength{\headsep}{-12pt} % Reduce space between header and content
\setlength{\headheight}{85pt} % If less, LaTeX automatically increases it
\renewcommand{\footrulewidth}{0pt} % Remove footer line
\renewcommand{\headrulewidth}{0pt} % Remove header line
\renewcommand{\seqinsert}{\ifmmode\allowbreak\else\-\fi} % Hyphens in seqsplit
% This two commands together give roughly
% the right line height in the tables
\renewcommand{\arraystretch}{1.3}
\onehalfspacing

% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
\newcommand{\mymulticolumn}[3]{\multicolumn{#1}{>{\columncolor{\RowColorName}}#2}{#3}} % For coloured multi-cols
\newcolumntype{x}[1]{>{\raggedright}p{#1}} % New column types for ragged-right paragraph columns
\newcommand{\tn}{\tabularnewline} % Required as custom column type in use

% Font and Colours
\definecolor{HeadBackground}{HTML}{333333}
\definecolor{FootBackground}{HTML}{666666}
\definecolor{TextColor}{HTML}{333333}
\definecolor{DarkBackground}{HTML}{0C44C7}
\definecolor{LightBackground}{HTML}{EFF3FB}
\renewcommand{\familydefault}{\sfdefault}
\color{TextColor}

% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Topic 1: Hardware and Software Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{ingerlm} via \textcolor{DarkBackground}{\uline{cheatography.com/174143/cs/36585/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}ingerlm \\
  \uline{cheatography.com/ingerlm} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Not Yet Published.\\
   Updated 18th January, 2023.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
  \SetRowColor{white}
  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
\raggedright
\raggedcolumns

% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.

\begin{multicols*}{2}

\begin{tabularx}{8.4cm}{x{2.204 cm} x{2.508 cm} x{2.888 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{3}{x{8.4cm}}{\bf\textcolor{white}{Conversions}}  \tn
% Row 0
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8 bit & 1 Byte & x 8 (-\textgreater{}bits) \tn 
% Row Count 1 (+ 1)
% Row 1
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1024 Bytes & 1 KibiByte (KiB) & x 1024 (-\textgreater{}Bytes) \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
1024 KibiBytes & 1 MebiByte (MiB) & x 1024$^{\textrm{2}}$ (-\textgreater{}Bytes) \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
1024 MebiBytes & 1 GibiByte (GiB) & x 1024$^{\textrm{3}}$ (-\textgreater{}Bytes) \tn 
% Row Count 7 (+ 2)
% Row 4
\SetRowColor{LightBackground}
1024 GibiBytes & 1 TebiByte (TiB) & x 1024$^{\textrm{4}}$ (-\textgreater{}Bytes) \tn 
% Row Count 9 (+ 2)
% Row 5
\SetRowColor{white}
4 bit & 1 nibble & x 4 (-\textgreater{}bits) \tn 
% Row Count 10 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}---}
\SetRowColor{LightBackground}
\mymulticolumn{3}{x{8.4cm}}{transmission speed = file size / time taken \newline image file size = height in pixles x width in pixles x bit depth(or colour depth) \newline text file size = number of bits per character x number of characters \newline sound file size = sample rate x duration x bit depth}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}---}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Assess performance of digital devices}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{speed} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{capacity} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{portability} \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{bandwidth} \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{power efficiency} \tn 
% Row Count 5 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{2.16 cm} x{5.84 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Embedded System}}  \tn
% Row 0
\SetRowColor{LightBackground}
\seqsplit{Characteristics} & Created to perform the task within a certain time frame \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
 & Task specific \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
 & High efficiency \tn 
% Row Count 4 (+ 1)
% Row 3
\SetRowColor{white}
 & Works with less power \tn 
% Row Count 5 (+ 1)
% Row 4
\SetRowColor{LightBackground}
 & High reliablility \tn 
% Row Count 6 (+ 1)
% Row 5
\SetRowColor{white}
 & Very Stable \tn 
% Row Count 7 (+ 1)
% Row 6
\SetRowColor{LightBackground}
 & Minimal or no user interface \tn 
% Row Count 8 (+ 1)
% Row 7
\SetRowColor{white}
 & Less expencive \tn 
% Row Count 9 (+ 1)
% Row 8
\SetRowColor{LightBackground}
 & Small sized \tn 
% Row Count 10 (+ 1)
% Row 9
\SetRowColor{white}
 & Hardware is used for security and performance \tn 
% Row Count 12 (+ 2)
% Row 10
\SetRowColor{LightBackground}
 & Software is used for features \tn 
% Row Count 13 (+ 1)
% Row 11
\SetRowColor{white}
\mymulticolumn{2}{x{8.4cm}}{Features and Functions} \tn 
% Row Count 14 (+ 1)
% Row 12
\SetRowColor{LightBackground}
\seqsplit{Advantages} & Portable \tn 
% Row Count 15 (+ 1)
% Row 13
\SetRowColor{white}
 & High performance \tn 
% Row Count 16 (+ 1)
% Row 14
\SetRowColor{LightBackground}
 & Less energy consumption \tn 
% Row Count 17 (+ 1)
% Row 15
\SetRowColor{white}
\seqsplit{Disadvantages} & Minimal or no user interface \tn 
% Row Count 19 (+ 2)
% Row 16
\SetRowColor{LightBackground}
 & No or little expansion capability \tn 
% Row Count 21 (+ 2)
% Row 17
\SetRowColor{white}
 & Security features (hardware) \tn 
% Row Count 22 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{Embedded Systems - programmed hardware devices that run on hardware chips, they are designed to work for single or few specific functions often within a larger system}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}