32 lines
1.5 KiB
Markdown
32 lines
1.5 KiB
Markdown
# PowerBook adapter for BlueSCSI, v1.0
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https://github.com/xunker/bluescsi_pb/v1.0
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## March 2021
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## Deprecation Notice
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This design is deprecated and should no longer be used. Please [see v1.1 instead](../v1.1).
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## Gerber files
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Gerber files can be [found here in the gerber directory](gerber).
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## Notes
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First version. 50-pin-SCSI, termination and SD card worked first time, right out of the gate. However, problems:
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* The screw holes are slightly too far in from edges
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* `RETURN` lines are not connected to signal ground
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* Can only power STM32 from `MOTORPWR` *or* USB, no option to power it from from `TERMPWR` alone
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* No option to disconnect STM32 from *both* `TERMPWR` and `MOTORPWR` power and use USB power alone without backfeeding
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If you choose to use this board design, **please do the following**:
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* break the `MOTORPWR` trace, as seen in [this image](../images/j2.jpg)
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* Solder a wire from any ground pin to one of the `RETURN` pins (number 3, 4, 37 or 38) of `J1`. These are 1 column in from each edge, and and connected together. They are next to the `MOTORPWR` pins, the trace you broke above.
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* Ensure J9 ("bridge +5v and term power") is always shorted/jumped
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Why the modifications? the `MOTORPWR` pins do not appear to be working the way I expect. The power was being disconnected at unexpected times and I could not see a pattern. Maybe it is a power-saving feature? Until I figure it out and update the board design, I recommend you power the device from `TERMPWR` as usual.
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