File:Cumana pre-production 68008 2nd processor (top).jpg

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Cumana_pre-production_68008_2nd_processor_(top).jpg ‎(640 × 284 pixels, file size: 58 KB, MIME type: image/jpeg)

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English: Cumana pre-production 68008 2nd processor (top).This board is a Cumana 68008 Issue A second processor, which to me means it is a pre-production model. The battery at the bottom left has been removed because it was leaking.

The board contains:

  • 2 x MC68C21P PIAs (Peripheral Interface Adapters) on the left side
  • HD146818P Real Time Clock beneath the MC68C21Ps
  • 16MHz crystal beneath the HD146818P
  • An unknown IC marked RS "301-117" is to the right of the MC68C21P, I think this is a disc controller.
  • Floppy disc connector above the unknown IC
  • SASI connector above the FDD connector
  • The lower socket in the middle is connected to the BBC Micro via a ribbon cable which replaces the BBC Micro's 6502 CPU
  • The BBC Micro's 6502 CPU is plugged into the upper socket.
  • The MC68008P8 is the large IC in the top right
  • The 16 x HM50256P-15 ICs ( 256Kb DRAM) at the bottom right provide 512KB Dynamic RAM
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: Cumana 68008 2nd processor 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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