I vaguely remember that all 2532 and 2732 EPROMs were compatible *except* t=
 he TI one.
 (or was it an other manufacturer?)
 From that one manufacturer the 2532 used a
*second* power supply ... was it= 
  -5V? 
You're thinking of the 2K byte (16K bit)  EPROMs. Everybody but TI made a
2716 that was single-rail (+5V supply only). TI's 2716 was a 3-rail part
(+5V, +12V, -5V), the TI 2516 was single-rail part and much the same as
everyone else's 2716.
-tony