Molex78802 Module: Difference between revisions
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===Chamfer=== | ===Chamfer=== | ||
The "chamfer" version is the default version. REX, REXCPM, REX#, Teeprom, and Meeprom all use this version. | The "chamfer" version is the default version. REX, REXCPM, REX#, Teeprom, and Meeprom all use this version. | ||
Polarity is provided by a small chamfer in one corner. This version is the most practical to make, because it's the easiest to clean up the panelization tabs and castellated edges by just laying sandpaper on a flat surface. There are no inside corners and no edges that aren't simple and straight. You clean up the panelization break-off points, and if necessary fine-tune the width or length, by just running the edges on sandpaper on a cutting board or other flat surface. | |||
* [http://shpws.me/Ryuj Order from Shapeways] | * [http://shpws.me/Ryuj Order from Shapeways] | ||
* [https://www.sculpteo.com/en/print/pcb2molex8878_chamfer-5/QTUkjwb3 Order from Sculpteo] | * [https://www.sculpteo.com/en/print/pcb2molex8878_chamfer-5/QTUkjwb3 Order from Sculpteo] | ||
Revision as of 17:37, 2 May 2020
This is a 3d-printable plastic carrier and matching empty PCB template to fit in the carrier, and both together fit in the option-rom socket in Tandy models 100, 102, 200, & 600. (and any other machine that has that same socket, such as Epson PX-4 & PX-8)
Pics: https://photos.app.goo.gl/stToXok3f2jYjbXd6
Source CAD files for both carrier and pcb: https://github.com/bkw777/pcb2molex8878
Carrier: Shapeways Sculpteo Thingiverse
To start a new PCB design based on this PCB template and carrier
- clone the git repo
- copy the PCB directory to a new directory named after the new project
- open the files in the new directory with kicad
Boards which use these
Variants
The OpenSCAD source file has options to generate these different versions of the carrier, and the PCB directory has matching PCB templates for each.
Chamfer
The "chamfer" version is the default version. REX, REXCPM, REX#, Teeprom, and Meeprom all use this version.
Polarity is provided by a small chamfer in one corner. This version is the most practical to make, because it's the easiest to clean up the panelization tabs and castellated edges by just laying sandpaper on a flat surface. There are no inside corners and no edges that aren't simple and straight. You clean up the panelization break-off points, and if necessary fine-tune the width or length, by just running the edges on sandpaper on a cutting board or other flat surface.
Bump
The "bump" version of the carrier can also hold a plain rectangle pcb with no polarity features. It can hold an original REX1, if you are willing to sand the edges of the pcb down a little.
Max
The "max" version maximizes the available usable pcb real-estate on both the top and bottom surfaces.
Pin
The "pin" version uses a pin and a hole for polarity instead of a chamfer. There is no special advantage to this version over the "chamfer" or "bump" versions.
