greenscsi/docs/1.0b-to-1.0c.adoc

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2021-04-03 19:43:12 +00:00
# BlueSCSI 1.0-b to 1.0-c
:toc: macro
## Introduction
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 recived a Fully Assembled BlueSCSI after April 1st, 2021 then this was done for you. If you have a kit labled 1.0-b you can make these modifications to become a 1.0-c.
## Steps
### Disconnect `TERMPOWER` from 220 Pull Up Jupmer
Use a cutting tool to cut the small trace between the `TERMPOWR` and 220 Pull Up Jumper pictured below.
Make sure continiutiy from `TERMPOWER` to the diode still flows correctly but is disconnected from the jumper.
image::images/1.0-b-bodge-1.jpg[]
### Connect 5V to 220 Pull Up Jupmer
Now we will provide pull up from the 5v provided by the BluePill.
image::images/1.0-b-bodge-2.png[]
### Complete!
Thats it! 5v to the Pull Up resistors will now work when powered externally.