Category:PCB Assembly Raspberry Pi

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The Raspberry Pi is a series of small single-board computers developed in the United Kingdom by the Raspberry Pi Foundation to promote the teaching of basic computer science in schools and in developing countries.

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Remaking the PDP-8/I using Raspberry Pi Reply 2017-02-13 22:33:13
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Gerhard Drisch

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Remaking the PDP-8/I using the Pi, simh & a replica front panel: a true catching project!
Goal: a (very) low cost full replica of the PDP-8/I.
Design: use the $20 Raspberry PI Model A+, a custom front panel PCB to mount it behind, and 26 nice-to-use toggle switches. Extend the simh emulator to drive the front panel.
Reason: PDP-8 replicas can get very expensive very quickly. The idea was to do the exact opposite: design a faithful replica using minimum parts. Made possible by the fact that the computing engine is available for $20 (Pi model A+) and in software, there’s no better replica of PDP-8 functionality than the simh emulator.
Result: Pi drives the 92 leds and 26 switches using a multiplexing process running in parallel to the simh emulator. Only a few ARM instructions are necessary to update the front panel during a PDP instruction cycle. An acrylic front panel faithfully reproduces that of the original.
Components
  • 1×Raspberry Pi (Plus or 2)needs 40 pin GPIO connector
  • 26×Toggle switches
  • 12×390 Ohm resistors
  • 26×4148 Diodes
  • 1×UDN2981A (optional)Interface and IO ICs / Peripheral Drivers and Actuators
  • 1×PCBDesigned in Kicad/Open source hardware design
  • 89×LEDs (5mm, High Brightness)Electronic Components / Misc. Electronic Components
  • 3×1K Ohm Resistors
  • 1×2*20 pin header for mounting the Raspberyr Pi
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Statement: This post is only the personal view of the author and does not represent the opinions of ALLPCB.com.

Yucel Calik

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Thanks for the article. Very valuable.
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