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New Board Development - SBC6120-RBC Edition [message #454] Thu, 07 April 2016 21:27 Go to previous message
Andrew B is currently offline  Andrew B
Messages: 467
Registered: October 2015
Location: Near Redmond, WA
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All - I'm happy to announce the development of a new RBC SBC board, the SBC6120-RBC Edition

This is a re-layout of the Spare Time Gizmos SBC6120 into a 2-layer board routed in KiCAD.

I have setup a page for it on the Wiki here - SBC6120-RBC Edition

For those who aren't familiar with the SBC6120, it is a single board computer using the Harris HD-6120 "PDP-8 on a chip" which can be used to run vintage DEC software such as OS/8, FOCAL, and of course, Adventure! Robert Armstrong of Spare Time Gizmos licensed the design files under the GNU FDL and the software under the GPL, so I've taken advantage of that to create a new version of this workhorse board.

Right now I have a "minimum changes" version of the board already routed in FreeRouter. I've:
*Re-routed the board as a 2-layer board, with double-width traces for VCC and GND and flood-fills for VCC and GND on the top and bottom of the board.
*Added a jumper which allows either 27C256 EPROMS (original design) or 28C256 EEPROMs to be used (one of the address pins goes to a different location on the two chips).
*Made some slight changes to the POST display to allow standard rectangular LEDs to be used, and a slightly different reset switch.
*Tweaked a few locations of things to make the new silkscreens look better.
Everything else is unchanged from the original design.

Are there any other changes anyone would suggest before I go to prototypes on this?

[Updated on: Thu, 07 April 2016 21:28]

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