MajenkoProjects/vs2k-patch-roms
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Updated README

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Matt Jenkins
2026-03-25 22:52:20 +00:00
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README.md
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@@ -123,3 +123,8 @@ Postscript
The patches do not calculate the checksum for the ROMs. This means you will get the VAXstation
failiing at bootup with an error 5?? with `SYS 0000.0002`. Work is going on to rectify this, including
reverse engineering of the checksum algorithm and the system test 5 to work out what is needed. Watch this space.
## Update:
The ROMs have now been updated with the correct checksums. It turns out the checksum is calculated per physical ROM,
and is a simple rotate-left-and-add method. I wrote a [little program](https://github.com/MajenkoProjects/vaxcheck) to calculate the checksums for me.