Re: R: I: STAR CASTLE PCB with a "little" problem - SOLLVED

From: John Robertson <pinball_at_telus.net>
Date: Wed Jun 22 2011 - 12:34:16 EDT

vernimark wrote:
> As you know I started from this condition:
>
> http://www.youtube.com/watch?v=n9h0c9qYkZM
>
> After some checks the problem was in a faulty 74194 (4-BIT BIDIRECTIONAL
> UNIVERSAL SHIFT REGISTERS) in position N4: Secondary accumulator, logic
> block 3
>
> regards,
> vernimark
> www.vernimark.com/arcade
>
>
74194's seem to fail disproportionally over other TTL.

I too would like to know who you found this one. Did you use the Cine
box or a 'scope? A logic comparator is handy...

John :-#)#
>
> -----Original Message-----
> From: owner-vectorlist@vectorlist.org
> [mailto:owner-vectorlist@vectorlist.org] On Behalf Of vernimark
> Sent: mercoledý 8 giugno 2011 16.43
> To: vectorlist@vectorlist.org
> Subject: RE: R: VECTOR: I: STAR CASTLE PCB with a "little" problem
>
> Monitor is ok (star hawk and armor attack work well), this evening I'll
> check the PCB flat connector
>
> -----Original Message-----
> From: owner-vectorlist@vectorlist.org
> [mailto:owner-vectorlist@vectorlist.org] On Behalf Of Christopher X.
> Candreva
> Sent: mercoledý 8 giugno 2011 16.25
> To: vectorlist@vectorlist.org
> Subject: Re: R: VECTOR: I: STAR CASTLE PCB with a "little" problem
>
> On Wed, 8 Jun 2011, vernimark wrote:
>
>
>> I'm sorry for the quality of my video, but if you look it carefully you
>>
> can see the "rings" of the castle
>
>> shake a little bit. But if you look more carefully the rings don't shake
>>
> , they are simply drawn with some
>
>> segment vertex wrong for a short time, just a "frame" (I know we don't
>>
> have frames in vector games). The same
>
>> happens with the animy starship: when it rotates in some positions and for
>>
> a very short time, some vertex are
>
>> wrong. So definitely it is not a problem limited to one object.
>> I already changed 181 TTL RAMs and ROMs
>>
>
> If it's all objects then maybe it's one of the DACs, either a stuck pin or
> just one "bit" with a desoldered pin.
>
> ==========================================================
> Chris Candreva -- chris@westnet.com -- (914) 948-3162
> WestNet Internet Services of Westchester
> http://www.westnet.com/

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Received on Wed Jun 22 12:34:21 2011

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