File:PMS B2P-6502 open.jpg

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PMS_B2P-6502_open.jpg ‎(613 × 480 pixels, file size: 56 KB, MIME type: image/jpeg)

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English: PMS B2P-6502 open.The Permanent Memory Ssystems (PMS) B2P is a 6502 second processor for the BBC micro. Like the Acorn 6502 second processor it connects via the Tube but rather than use the Tube ULA to control data transfers, it has its own code and the NPFD signal on the 1MHz bus, It also runs a 2 MHz 65C02 CPU where the Acorn CPU is clocked at 3MHz, But it only cost £200 instead of £399. There is also the BOS ROM which is fitted to the BBC micro to control communication.In the pictures above the ribbon cable plugs into the Tube port of the BBC Micro and the yellow/green cable connect to pins 11 & 12 on the 1 MHz bus.Here is the B2P-6502 User Guide, PMS system discs note, 1MHz Bus NPFD signal and Reset switch note and B2p HiWordwise Note .In March 1987 Acorn User published a review titled "Second Half ".
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: Permanent Memory Systems B2P-6502 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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current13:14, 15 December 2011Thumbnail for version as of 13:14, 15 December 2011613 × 480 (56 KB)Smallbot (talk | contribs)Commons:Bots/Requests/Smallbot Uploading images from http://acorn.chriswhy.co.uk/8bit_Upgrades/PMS_B2P.html

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