File:Aries B20 20K RAM expansion (top).jpg

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English: Aries B20 20K RAM expansion (top).The Aries B20 20K RAM expansion adds 20K shadow RAM to the BBC Micro. It consists of a board with 10 x 2K RAM chips and a managing ROM. The board plugs into IC1 on the BBC Micro's motherboard. The 6502 CPU is relocated to the socket on the Aries B20. The ROM plugs into one of the BBC Micro's sideways ROM sockets.

The Aries B20 provides an additonal 20K RAM which is mapped from &3000-&7FFF in parallel with normal memory. The Aries ROM intercepts all references to the area above &3000 (excluding the screen) and diverts them to the B20 RAM. This is entirely automatic and provides a useable memory of 28K regardless of screen mode.

The Aries B20 can be used with the Aries B12 Sideways ROM board where it replaces the B12 Adapter board and is connected to the B12 via the 5 pin header (see picture 1 top right.
Date between circa 2004 and circa 2011
date QS:P,+2050-00-00T00:00:00Z/7,P1319,+2004-00-00T00:00:00Z/9,P1326,+2011-00-00T00:00:00Z/9,P1480,Q5727902
Source Chris's Acorns: Aries B20 20K RAM Expansion Direct
Author Chris Whytehead
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Chris's Acorns This photograph originates from Chris's Acorns, a collection of material relating to Acorn Computers. The photograph was created between ~2004 and 2011 by Chris Whytehead. Please use the photo while adhering to the license including the attribution to "Chris Whytehead, Chris's Acorns – CC-BY-SA-3.0".

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Information (including text and photos) presented on Chris's Acorns may be reused under the Creative Commons Attribution-Share Alike 3.0 Unported unless otherwise specified. Some information, in particular all the information in the documentation section (e.g. brochures, manuals and books) and the software section (e.g. programs and disc images) remain the copyright of their respective owners and may not be reused without their permission. Images may contain trademarks which remain the property of their respective owners.

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Attribution: Chris Whytehead, Chris's Acorns – CC-BY-SA-3.0
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current03:22, 15 December 2011Thumbnail for version as of 03:22, 15 December 2011640 × 353 (43 KB)Smallbot (talk | contribs)Commons:Bots/Requests/Smallbot Uploading images from http://acorn.chriswhy.co.uk/8bit_Upgrades/Aries_B20.html

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