Missing Unix Version 7 ms Macros (The GNU Troff Manual)

#### 4.6.7.1 Unix Version 7 `ms` macros not implemented by `groff` `ms`

Several macros described in the Unix Version 7 `ms` documentation are unimplemented by `groff` `ms` because they are specific to the requirements of documents produced internally by Bell Laboratories, some of which also require a glyph for the Bell System logo that `groff` does not support. These macros implemented several document type formats (`EG`, `IM`, `MF`, `MR`, `TM`, `TR`), were meaningful only in conjunction with the use of certain document types (`AT`, `CS`, `CT`, `OK`, `SG`), stored the postal addresses of Bell Labs sites (`HO`, `IH`, `MH`, `PY`, `WH`), or lacked a stable definition over time (`UX`). To compatibly render historical `ms` documents using these macros, we advise your documents to invoke the `rm` request to remove any such macros it uses and then define replacements with an authentically typeset original at hand.17 For informal purposes, a simple definition of `UX` should maintain the readability of the document’s substance.

    .rm UX
    .ds UX Unix\"