PowerBook adapter for BlueSCSI, v1.0
This design is deprecated and should no longer be used. Please see v1.1 instead.
Gerber files can be found here in the gerber directory.
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
RETURNlines are not connected to signal ground
- Can only power STM32 from
MOTORPWRor USB, no option to power it from from
- No option to disconnect STM32 from both
MOTORPWRpower and use USB power alone without backfeeding
If you choose to use this board design, please do the following:
- break the
MOTORPWRtrace, as seen in this image
- Solder a wire from any ground pin to one of the
RETURNpins (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
MOTORPWRpins, 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.