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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@@ -123,3 +123,8 @@ Postscript
The patches do not calculate the checksum for the ROMs. This means you will get the VAXstation 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 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. 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.