bluescsi_pb/v1.1
Matthew Nielsen 0549f643fe Move details about each version to separate files.
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Add more detail and pictures to v1.1.
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README.md

PowerBook adapter for BlueSCSI, v1.1

https://github.com/xunker/bluescsi_pb/v1.1

April 2021

This design is the current design. It replaces v1.0.

Gerber files

Gerber files can be found here in the gerber directory.

3D rendering of bluescsi_pb v1.1 board

Picture of bluescsi_pb connected to PowerBook 520c

Changes from v1.0

Changes in order of importance:

  • Mounting hole locations adjusted so they match an actual drive
  • Connect RETURN on 40-pin SCSI connector with signal ground
  • STM32 +5 is connected to TERMPWR by default, via breakable jumper pad
  • Separate jumpers provided for powering via TERMPWR or MOTORPWR
    • MOTORPWR is a separate +5v provided to run the drive motor and actuator
    • This change will be helpful for debugging power issues where MOTORPWR appears to be inconsistent
  • Activity LED (LED_BUILTIN) broken-out if you want to have an external LED
  • Increased TERMPWR trace width
  • Traces and resistor packs are moved farther away from mounting holes to avoid potential shorts
  • Back silkscreen marks location of the key pin (17) within the 40-pin connector
  • Moved legends for J1, J2 and J8 so they are next to pin 1 on their respective connectors
  • Corners rounded more
  • Numerous changes to the routing of traces
  • Shorten board by about 5mm
    • This is the shortest practical length to maintain all four screw holes

v1.0 and v1.1 side-by-side to show differences

Comparison with 2.5in drive

A 2.5 inch SCSI drive is 100mm x 70mm. This version of bluescsi_pb is 72mm x 67mm, or 77mm x 67mm once the 40-pin connector is attached.

Picture of bare bluescsi_pb board attached to bottom of 2.5in SCSI drive to show size differences