Information on the PPS-4/1 4 bit microprocessor wanted

Hi all I am a retro fan doing both EE and CE. I started with ZX81/Lambda/New Brain/Commodore. I am also the proud owner of a Mattel Battelstar Galatica anno 1979 week 14. The chip used in this vintage handheld game is labeled B6001EA and I guess it's a Rockwell International PPS-4/1 micro controller (a PPS-4 cpu with clock, ram and rom) from sources I found on the net. I have found very good documentation on the PPS-4 CPU chip (note the missing "/1" postfix) here: http://www.bitsavers.org/pdf/rockwell/PPS-4_Data_Sheet_1974.pdf And I found the owners manual for the game here: http://www.handheldmuseum.com/Manuals/Mattel-BattlestarGalacticaManual.pdf But I haven't been able to find any documentation on the PPS-4/1 chip that I believe is used in the game. I found that later revisions of the PPS-4 CPU was labeled PPS-4/2 and the 'newest' one PPS-4/1 (one would guess that /1 was older than /2). I do believe (again from internet sources) that the PPS-4/2 means that a minimal system could be made of two chips, a PPS-4/2 and a combined RAM/ROM. So since there is only one chip in my handheld game, I guess it's a PPS-4/1 where I again take a wild guess that the above two chip minimal combination is in one chip just like most micro controllers today. I am also guessing that since the chip ends with EA it could have a "electrically alterable" rom instead of a maskable rom. So I would like to hear all you guys if anyone of you could provide me more information on the specific chip and if all my guesses are right or wrong. Also if there is some way to dump the rom (without decapping the chip). The end goal for me is to create an PPS-1 emulator (and possible running the game) Regards Benjamin