# PowerBook adapter for BlueSCSI, v1.0

https://github.com/xunker/bluescsi_pb/v1.0

## March 2021

## Deprecation Notice

This design is deprecated and should no longer be used. Please [see v1.1 instead](../v1.1).

## Gerber files

Gerber files can be [found here in the gerber directory](gerber).

## Notes

First version. 50-pin-SCSI, termination and SD card worked first time, right out of the gate. However, problems:

* The screw holes are slightly too far in from edges
* `RETURN` lines are not connected to signal ground
* Can only power STM32 from `MOTORPWR` *or* USB, no option to power it from from `TERMPWR` alone
* No option to disconnect STM32 from *both* `TERMPWR` and `MOTORPWR` power and use USB power alone without backfeeding

If you choose to use this board design, **please do the following**:
* break the `MOTORPWR` trace, as seen in [this image](../images/j2.jpg)
* 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.
* Ensure J9 ("bridge +5v and term power") is always shorted/jumped

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.

![3D rendering of bluescsi_pb v1.0 board ](../images/pcb_v1.0_render.jpg)