History

Matthew Nielsen 0549f643fe Move details about each version to separate files. Move future plans to separate file. Move BOM to separate file. Add more detail and pictures to v1.1.		2021-04-22 20:20:01 -06:00
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gerber	initial commit	2021-04-03 21:23:17 -06:00
README.md	Move details about each version to separate files.	2021-04-22 20:20:01 -06:00
bluescsi_pb_v1.0.jpg	Updated readme, add image of 1.0	2021-04-03 21:35:54 -06:00
bluescsi_powerbook_v1.0.jpg	rename	2021-04-05 10:26:39 -06:00

README.md

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.

Gerber files

Gerber files can be found here in the gerber directory.

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
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.