28 lines
892 B
Plaintext
28 lines
892 B
Plaintext
# BlueSCSI 1.0-b to 1.0-c
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:toc: macro
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## Introduction
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1.0-c was a small change to fix an issue with machines that provide low or no `TERMPOWER` over the SCSI bus. If you received a fully-assembled BlueSCSI after April 1st, 2021 then this was done for you. If you have a kit labeled 1.0-b you can make these modifications to become a 1.0-c.
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## Steps
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### Disconnect `TERMPOWER` from 220 Pull Up Jumper
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Use a cutting tool to cut the small trace between the `TERMPOWR` and 220 Pull Up Jumper pictured below.
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Make sure continuity from `TERMPOWER` to the diode still flows correctly but is disconnected from the jumper.
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image::images/1.0-b-bodge-1.jpg[]
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### Connect 5V to 220 Pull Up Jumper
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Now we will provide pull up from the 5V provided by the BluePill.
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image::images/1.0-b-bodge-2.png[]
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### Complete!
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That’s it! 5V to the Pull Up resistors will now work when powered externally.
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