IBM 51xx PC Family Computers

Reference Manuals and Documentation ¹⁾
IBM Color Graphics Monitor Adapter (CGA) ²⁾ – hardwrae reference

¹⁾ https://web.archive.org/web/20190507124500/http://minuszerodegrees.net/index.htm

²⁾ https://web.archive.org/web/20181215121857/http://www.minuszerodegrees.net/oa/OA%20-%20IBM%20Color%20Graphics%20Monitor%20Adapter%20(CGA).pdf