26-6401 TRS-XENIX Development System v1.2.0 This is the software development system v1.2.0 for TRS-XENIX 1.x. There are several packages here, each one imaged from different sources. 26-6401a seems to be complete but has one known issue with the AS program on disk #2 which is not working properly. 26-6401b has a few issues. It is missing disk #7. Disk #8 core dumps. To get a good working installation, it is suggested to use 26-6401a, but replace disk #2 with the disk #2 from 26-6401b. There may be other known issues, which is why all imaged sets are being made available.