Re: New to the list

The pictures are really helpful. Wow, talk about an obvious bootleg. It
makes you wonder how Sega got away with it. One would expect them to have
been severely sued. I wonder if they were!

Interesting changes were made...

- The audio was integrated into the main board and thus the ribbon cable
eliminated.
- The monitor ribbon connector and cp ribbon connector and power connector
were all integrated together into an edge connector.
- There are two blank DIP16s on the logic board just like on the Cine board
but there's also the addition of five DIP prototyping patterns for the
option of hand wirinig some undefined chips in the future should there prove
to be a design problem.
- The EPROM's were replaced with bipolar PROMs. This was probably cheaper
but man, talk about development issues.
- The PCB space for the D8 & U14 exorciser DIP connections is open and
available but obviously not used. How the heck did Sega or service people
troubleshoot this darn thing? I couldn't even see an LED anywhere.

>From your pics, it appears that someone has previously replaced or reflowed
all of the PROMs at least once already. If any of them are faulty, you'll
obvioualy need the binaries. Does anyone on the vectorlist have these for
Fabrice? It never hurts to ask. Maybe you can get new chips burned at
www.arcadechips.com . Try
http://www.arcadechips.com/product_info.php?cPath=27_23&products_id=68

I just have to say it... from one of your pics... that spider skeleton is
the biggest ugliest scariest dam thing I've ever seen. If I had removed the
back door and seen that, I would have s**t myself. The biggest spiders that
live around here are maybe at most 1.5" across the leg tips. That thing in
your pic is a monster.

Good luck with your project. I hope you manage to get it working.

William Boucher

----- Original Message -----
From: "Fabrice GIRARDOT" <f4brice@gmail.com>
To: <vectorlist@vectorlist.org>
Sent: Sunday, January 10, 2010 7:25 AM
Subject: Re: VECTOR: New to the list

>
> Hi all, hi William.
>
> Thanks a lot for your detailled answer.
> Yesterday, just before registering to the list, I did a lot of searches
> in the list archive.
> I did found the http://www.biltronix.com/ link and some interresting
> informations on the CCPU (Exorciser...).
>
>> Be aware that a factory original copy is not necessarily a great copy.
>
> That's what you just made me understand...
> I thought quality was lost during scanning process, but in fact
> pdf document is close to the original document.
> Your VB scan will help me on some drawings. Some chips references/pins
> are less unreadable on your document than on the Cine doc.
>
>> I would offer to repair your CCPU but if it is a copy made by Sega or
>> whomever, then I wouldn't know if the circuitry is actually all the same
>> or not.
>
> Up to now, I found only 1 single difference between SEGA's design
> and Cine's design.
> SEGA is using 8 x 4-bits PROMs (MB7054, HM7643) where Cine is using
> 2 or 4 chips.
> SEGA is refering its chips from "IC001" to "IC151" and Cine is using
> line/column location. But same chips are sitting on same place on PCB.
> For example, Cine's chip B12 (74LS10) is called "IC113" by SEGA and
> sits on the same place (close to a corner).
>
> I want to try to repair this PCB by myself and I think I have enough
> skills at leat not to damage it more.
> Maybe once I'll have taken 1 kg aspirine I'll go back to you. :-)
> But SEGA did not put sockets at D8 & U14 for an Exorciser use !
>
>> Is the monitor in the game using the digital ribbon cable input? Is
>> there a digital to analog converter board in between the CCPU and a
>> monitor that has an analog input? Just wondering. If the CCPU circuitry
>> is identical, then I should be able to repair it if it should ever come
>> to that.
>
> There is no ribbon cable between the game PCB and the monitor.
> There are about 30 small individual wires tied together which is
> allmost the same.
> SEGA's monitor has exacly the same inputs & schematics as Cine's.
> There are two DAC80-CBI-V ceramic DAC chips, one LF13331
> analog switches, etc...
> CCPU is also driving beam brightness & intensity.
> Differences are on transistors references.
> SEGA uses japaneese semiconductors such as "2SD424" & "2SB554"
> for example for last stage of deflexion amp.
>
> Some picts can be seen here (PCB & monitor) :
> http://www.gamoover.net/Forums/index.php?topic=20677.0
>
>> The MMI 6331 is a standard bipolar prom and works the same as other
>> similar parts such as 74S288 or 82S123 made by other manufacturers. The
>> data outputs are valid any time the /G pin is active (low). There's no
>> clock input, just the enable input.
>
> Yep. SEGA's MMI6331 PROMs are always selected : pin 15 (/CS) is always
> grounded.
> I'm just surprised to see switching glitches on some data bits.
> When *1* single address bit changes (all other remain the same),
> I can see transient glitches on some data bits which should remain
> unaffected by this single address change due to PROM content.
>
>
> Regards,
>
> Fab
>
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Received on Sun Jan 10 13:20:59 2010