2114's ->RE: BattleZone probs....

I also experienced similar problems with 2114's on several of my Sega
G08 X-Y boards.
I had bought a bunch from BGI (2114AL- 2 ?) and since they were faster I
assumed they
should perform just as well, no such luck . I also tried 2148's with no
luck. I ended up
talking some older 2114's off of another PCB to solve the problem. Why
is this ? can
anyone explain ? Clay, didn't you discuss at one time making a simple
2114 tester ?

Todd Miller, IT Operations Dept.
Ron Weber and Associates
103 E. State Street, Mason City, IA 50401
(515)423-4293/(515)423-4594 FAX
http://www.telethinking.com

        -----Original Message-----
        From: Matt Rossiter - Verio Southern California
[SMTP:matt@rossiters.com]
        Sent: Sunday, January 17, 1999 10:43 PM
        To: vectorlist@mcfeeley.cc.utexas.edu
        Subject: Re: BattleZone probs....

        I had a problem just like this about a year ago. Mine was
complaing that
        one of the 2114s was bad. So I replaced it, then it complained
that
        another one was bad - and so on. ~augh~. Well it turns out
that
        Battlezone (or other 80's games that use 2114 chips) will choke
on newer
        versions of 2114 chips. I can't remember that exact part number
- but I
        know it was an Intel. The newer ones are faster and do cause
problems on
        Battlezones.

        To make a long story short, I put in an older version and
everything
        worked perfectly.

        Hope that helps.

        Matt

_____________________________________________________________________

        On Mon, 18 Jan 1999, Peter Pachla wrote:

> Been having another crack at fixing my BattleZone tonight and
I'm somewhat
> confused....
>
> The last time I looked at it (a few months back) the self-test
routine told me
> that one of the ROMs was bad, now it's telling me that
(another) one of the RAM
> chips has failed.
>
> I can't understand why this would be. I've tested all of the
TTL on the board
> with a logic comparator and none of the chips appear bad (I
had to replace
> three before) so it shouldn't be a memory decoding problem.
>
> Now, before I got the machine my friend who owned it then had
to repair the
> Audio/Reg II board since the 2N3055 on it packed up. He
replaced it with a
> fixed voltage regulator (modifying the circuit appropriately)
and I've noticed
> that the voltage reaching the analogue vector generator board
is a little on
> the low side at 4.73V, just outside normal TTL power specs.
>
> I'm assuming that this is causing my problems?
>
> My friend couldn't get a 2N3055 which is why he used a voltage
regulator
> instead. Are 2N3055s still available, if not can anyone
suggest a suitable
> alternative as I intend to reverse his mods and put things
back the way they
> should be?
>
>
> Back to tonight's "Voyager" (we're only about 18 months behind
you guys on this
> side of the pond).
>
>
> TTFN - Pete.
>
> --
> Peter Pachla: Computer Hardware & Software Engineer,
> Sound Engineer,
> Arcade Machines Collector,
> Obsolete Computer\Games Console Collector,
> Barman,
> & General Fun Guy....
>
> E-Mail: peter.pachla@virgin.net (primary account)
> peter.pachla@vectrex.freeserve.co.uk
> peter.pachla@wintermute.free-online.co.uk
> --
>
>
Received on Mon Jan 18 07:38:16 1999