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

From: vernimark <vernimark_at_vernimark.com>
Date: Wed Jun 22 2011 - 06:28:09 EDT

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

-----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
,áthey areásimply 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 06:28:29 2011

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