44 lines
1.8 KiB
Markdown
44 lines
1.8 KiB
Markdown
# PowerBook adapter for BlueSCSI, v1.1
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https://github.com/xunker/bluescsi_pb/v1.1
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## April 2021
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This design is the current design. It replaces [v1.0](../v1.0).
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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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## Changes from v1.0
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Changes in order of importance:
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* Mounting hole locations adjusted so they match an actual drive
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* Connect `RETURN` on 40-pin SCSI connector with signal ground
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* STM32 +5 is connected to `TERMPWR` by default, via breakable jumper pad
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* Separate jumpers provided for powering via `TERMPWR` or `MOTORPWR`
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- *MOTORPWR* is a separate +5v provided to run the drive motor and actuator
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- This change will be helpful for debugging power issues where *MOTORPWR* appears to be inconsistent
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* Activity LED (`LED_BUILTIN`) broken-out if you want to have an external LED
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* Increased `TERMPWR` trace width
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* Traces and resistor packs are moved farther away from mounting holes to avoid potential shorts
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* Back silkscreen marks location of the key pin (17) within the 40-pin connector
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* Moved legends for J1, J2 and J8 so they are next to pin 1 on their respective connectors
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* Corners rounded more
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* Numerous changes to the routing of traces
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* Shorten board by about 5mm
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- This is the shortest practical length to maintain all four screw holes
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## Comparison with 2.5in drive
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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.
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