Re: Tech: Embryon S&T ROM & Board Version Help

Ok, Here's what I found.
Looks like the two boards are very close to each other. Here's the differences:

AS-2518-61/61A/61B Squawk and Talk board:

-- "A" variant added some sort of delayed-power circuit to the speech
chip, presumably to correct odd noises on powerup?
-- "B" variant added in/out signals for Say It Again reverb board,
so only Centaur requires the B variant. (All games after Centaur
shipped with B variant anyway.)

So, All in need to do is make sure the board is in working order, then check the ROM placements and jumpers. I found all the links to this info in Clay's Bally section I mentioned before. Thanks Clay!!!!

Dave

dschulpius wrote:
David Schulpius wrote:
Hi all,

I have a couple Bally Embryons here and I'm trying to figure out if
the Squawk & Talk boards have the proper ROMs and chips installed.

I have two versions S&T boards:
P 2948 446a
P 2948 446b
Only difference I can see is that the "b" version has a 18 header pin
at J1 and the "a" version only has a 15 header pin there. Don't know
why "b' has three more pins.

Both boards I have here are configured differently (probably because
they came from different games). I need to know if the ROMs go in the
same sockets in each version and do I need a Sound Generating Chip in
the U12 socket for either board? The ROM sockets in question are U2
through U5 with the Sound Chip at U12. Here is how each board is
configured now:

Board 1:
P 2948 446a
ROM chips in U2 & U5
HAS a Sound Chip at U12

Board 2:
P 2948 446b
ROM chips in U4 & U5
NO Sound Chip at U12

If it helps I got the following information in a readme file that was
stored along with ROMs for this game I found on IPMD (but it's only
for the "a" version board):


Squawk and Talk is AS-2518-61A

841-01_4.716 - U4 for Squawk & Talk, 2716 [F467]
841-02_5.532 - U5 for Squawk & Talk, 2532 [4D1D]

NOTE: 841-04 (S&T U4) and 841-05 (S&T U5) is rumored
to be the latest version, but we do not have it
nor do we know what the differences might be.

AS-2518-61A (S&T) jumpers:
2532: C,E,D,G,Q,S,U,X,Y,AA
2732: C,E,F,P,R,T,U,X,Z,BB

Thanks, Dave Schulpius





Silly me, I just found a whole section in Clay's Bally section on his repair site on Bally ROMs and Jumpers settings. I'll read it over and see if what I need is there. A quick look showed me most of what I needed through this link in that section: http://www.pinrepair.com/bally/ballyrm1.htm . I'll study it and see if it tells me all I need to know.

Thanks, Dave
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