Raspberry Pi
Revised: 9 September 2016 - Design and Content  © Bernard Veasey 1996-2017 - All rights reserved.
The Raspberry Pi is a credit card sized computer created by the charity Raspberry Pi Foundation costing around £30.  It is made in the Sony factory in Wales at the rate of 11,000 per day.  Over 1 million were sold worldwide in its first year.  Up to Sep 2016, 10 million have been sold.  I choose to run RISC OS on it as it is fast to boot up and is intuitive to use.  The micro USB power socket in the Pi 3 model needs a 5v 2.5amp supply so that it can power the 4 USB ports, but make sure you use a reliable PSU as some cheap imports are known to blow up!  The Raspberry Pi model B+ itself only needs 600ma, which is 150ma less than its predecessors. The Rapberry Pi B+, Pi 2 and Pi 3 have the following ports: Power Micro USB connector for the PSU - 5v 2amp.  The Pi B+ itself uses up to 600maH (Pi B 750maH). HDMI Graphics and sound out to a HDMI monitor or TV. Ethernet Network lead to router for networking and on to the Internet. 4x USB For USB keyboard and mouse etc - or on to a powered USB hub. Audio out Stereo 3.5mm jack (when HDMI not used). Micro SD Socket for a micro SD card to hold the operating system, software and user files. It is best to use the Raspberry Pi with a HD 1920x1080 monitor (or TV) with an HDMI socket, but it can also be used with a monitor with a DVI-D connector if a DVI-D to HDMI adaptor is purchased.  It can also manage 1280x1024 @ 60Hz and 1920x1200 @ 60Hz etc.
Raspberry Pi B+
Raspberry Pi model B
Raspberry Pi 2 model B
512MB RAM 700MHz ARM 1176JZFS processor Micro SD card
1GB RAM 900MHz quad core ARM Cortex-A7 processor Micro SD card
1GB 900MHz RAM 1.2GHz quad core ARM Cortex-A53 processor Graphics - Broadcom VideoCore IV 10/100 Ethernet 2.4GHz 802.11n Wireless Bluetooth 4.1 Micro SD card
Raspberry Pi 3 model B