[sdiy] Prophet 5 EPROM replacement solution

[greg montalbano]

For the archives...

Been working on restoring a Rev 2 P5, and replacement 2708 EPROMs, while 
still available, are difficult (to say the least) to program.
Thanks to a tip from the lovely & talented Tom Moravansky, I found this page:
http://home.pi.be/~leonb1/zaccpu/e2708.htm
which details a simple method of replacing them with 2716 chips, which can 
be programmed by just about any prommer.  An added bonus is the fact that 
the +12 and -5 volt lines from the Prophet power supply are now 
unnecessary;  those two regulators can be disconnected, which may help give 
the sorely overworked +5 supply a little help.

Note that this applies to the Prophet Rev 3, as well;  it also uses the 2708.

By the way, I'm still trying to find a working copy of the files for the 
cassette firmware for the Rev 2;  either version 6.1c, or version 
7.0c.  Any help there would be appreciated.

Thanks to Tom & all the other folks on both lists who've assisted me in 
this endeavor;  I've almost got this beast back to it's full glory (have to 
agree with everyone who claims superiority for the Rev 2 -- it's got a 
smooth, BIG sound that can't be equaled).

~GMM