> So summarizing, you can combine T7 with U7 and P7 with
> R7 where you can combine the halves any way you want just
> as long as you do both pairs of halves in the same order.
> Then you can just slap them in two sockets (like T7 and
> P7) and if this doesn't work then you know that you should
> use the other two sockets (U7 and R7) instead. One set
> of sockets or the other must work!
Neat! Good to know... Steve, can you document what order corresponds to
which socket pair?
> By the way, I remembered that the Warrior data I have
> from Al only works with two 2532s on a Vectorbeam
> board....doesn't this sound alot like what I just did
> with Star Castle data on a Cinematronics board? So next
> time I try out things, I'm going to split the Warrior
> data up among some 2716s and plug it into a Star Castle
> motherboard!
Well, if splitting them will work, then plugging the 2532s in the rev K board
should work as well, right? (the proof is in your description of RO and SC
above) Save yourself some time and try the 2532s directly
> Ray, have you had any success with upgrading your SC Rev
> K motherboard to run Armor Attack?
Well, I decided not to do anything nasty like cut traces. I may be old
fashioned, but I prefer to keep all board hacks reversible (these are
collectables after all) What I've done so far is remove the 74LS107 at J10
and socket it. I am current making a daughter board that implements the
modified rev K PG0 and PG1 logic (including a 74LS00 as a sub for I10) in
order to get the A12 selection signal. That way, when you want to use the
board as a modified rev K board, you remove the IC at J10, and plug in the
daughter board. When you want to go back to the original, you remove the
daughter board and plug in a 74ls107
For the EPROMs, I decided not to cut traces (the A12 pin is grounded,
normally) Instead, I plan on using 4 sockets and bending up the appropriate
pin (A12), and wiring those to the daughter board directly. Again, easy to
pick and choose between using 2716s (or now 2532s) and 2732s.
The discussion about the 2532s got me thinking, though. If I have a daughter
board that is generating the A12 signal, and the appropriate CE signals for
the odd/even banks, why not combine all the EPROMs onto a single 27128? CE
can always be high, and the old CE signal can be used to select the
appropriate bank. If you want to extend it further, in the 4 game hack, put
all the images on a single 27512, with all the selection lines coming from the
daughter board. Certainly a lot cleaner than having 4 wire wrap sockets
crammed into the original sockets. All it would take is one 2716->27512
adapter in U7, with 4 wires coming from the daughter board, with a 2 position
dip switch on the daughterboard for game select. Trick would be to get the
ordering right on the EPROM, but that should be relatively straight forward.
Comments before I spend a lot of time on this? (Unfortunately, I have to
sneak in and use the EPROM burner at work, so turn around times are a little
slower than I like, esp. when experimenting with different orderings within a
large EPROM)
Ray
