PDF pages 202-206 (5 pages) of this National Databook over on Bitsavers include a good description of how to program them. It's an entire book so it takes a little while to download.
http://www.bitsavers.org/components/...y_Databook.pdf
If you are thinking of programming one yourself don't forget there was an official MK14 PROM programmer from SOC, details attached. You seem to have working MK14s lying around all over the place now, so...
Bear in mind however that this and all other programmers which handle the DM74S571 can not program the Tesla MH74S571, the hardware method and timing for programming that device are just too dissimilar.
Also bear in mind that these devices are one-shot, you only get one go at getting it right.