Build – PC in a Mouse !
Hardware & software used is below.
Hardware:
Orange Pi Zero (I bought 2, at $8 each)
https://www.zapals.com/orange-pi-zero-single-board-computer-512mb-development-board.html
8Gb micro SD card
About $5 (too much spam on adverts when looking for prices, but Class 10 is recommended)
Logitech optical mouse
Spare broken junk
4.3″ car reversing monitor – $12.81
http://www.ebay.com/itm/4-3inch-TFT-LCD-Car-Monitor-Reverse-Rearview-Color-Camera-DVD-VCR-CCTV-V-/112334509890
Similar model, mine is several months old and was $11
Rii wireless keyboard/mouse – $15
http://www.ebay.com/itm/Rii-Mini-X1-2-4Ghz-Mini-Wireless-Keyboard-Touchpad-for-PC-Smart-TV-Rasberry-PI-2/121917370909
PAM8403 based 3W audio amplifier – $0.74
http://www.ebay.com/itm/DC-5V-PAM8403-Audio-Stereo-Amplifier-Board-Volume-Control-Class-D-Kit-Module-/291411738289
0.25W speaker
Spare junk pile
Salvaged fan from a graphics card
Software:
RetrOrangePi 3.0.1
http://www.retrorangepi.org/
which includes Armbian 5.25 O/S, OpenElec, Kodi and all the games system + arcade emulators.
Armbian operating system standalone, if preferred