File:SJ Research HDFS circuit board (top).jpg

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SJ_Research_HDFS_circuit_board_(top).jpg (640 × 419 pixels, file size: 56 KB, MIME type: image/jpeg)

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English: SJ Research HDFS circuit board (top).The HDFS main circuit board showing:
  • in the bottom left the WD2793A controller for the tape drive
  • to the left is the NEC D8237AC DMA controller
  • at the back left is the CDP6402 UART
  • to the right iare the 32 x TMS4164 DRAM for the 256KB cache RAM
  • in the middle at the back is the SJ Research ROM marked "ZPROC ROM 130A"
  • below the ROM is a Z80B CPU with 128K RAM (16 x M5K4164 DRAM) to the right
  • in the top right is the Z80BSIO which also controls the Econet interface.
  • in the bottom right is the SJ Reseach ROM marked "JPROC ROM 1.05"
  • Below the ROm is the second Z80B CPU the 64KB RAM(8 x M5K4164 DRAM) to the right
  • The white label at the front in marked "serial number 1043"
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: SJ Research Hard Disc File Server 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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Attribution: Chris Whytehead, Chris's Acorns – CC-BY-SA-3.0
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current13:21, 15 December 2011Thumbnail for version as of 13:21, 15 December 2011640 × 419 (56 KB)Smallbot (talk | contribs)Commons:Bots/Requests/Smallbot Uploading images from http://acorn.chriswhy.co.uk/8bit_Upgrades/SJR_HDFS.html

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