Re: Battlezone and -5v

On top of that, I think there's an error in the schems as well (both 1st and 2nd printings, I can't find page 3A of the 3rd printing).

The rightmost two EPROMs in the VGROM section should be labeled "(2708)", not "(8316E)".  The 8316s are (AFAIK) more or less 2716s.  They have twice the capacity, so there should only be 2 of them req'd (vice 4 of the 2708s).  Also, the 2708s are the odd-ducks which required the -5V and +12V... 2716s (and 8315Es, I believe) only require +5.

df

--- On Wed, 9/1/10, Darren Finck <dgfinck@yahoo.com> wrote:

From: Darren Finck <dgfinck@yahoo.com>
Subject: Re: VECTOR: Battlezone and -5v
To: vectorlist@vectorlist.org
Date: Wednesday, September 1, 2010, 4:45 PM

I went a little loopy looking for where the -5V is used as well.  I finally found it on on sheet 03A.  In the upper right quadrant, there's a box labeled "Vector-Generator ROM."  Near the top of the box (just above and right of the "r" in Vector) are the -5V and +12V lines.  That's the only place I've found them anywhere in the schematics.

df

--- On Wed, 9/1/10, Kevin Moore <talon.k@gmail.com> wrote:

From: Kevin Moore <talon.k@gmail.com>
Subject: Re: VECTOR: Battlezone and -5v
To: vectorlist@vectorlist.org
Date: Wednesday, September 1, 2010, 4:09 PM

That's what I thought the 15 and -15 were for too.

Going along with the resistor idea, I had previously checked the resistor R69 since this is an earlier rev board, and C103 was added on to it as an after thought on this board. The cap was between pin 14 of D9 and R69 instead of between ground and R69. That didn't change anything.

I had been flexing the board to see if there were cold solder joints but that didn't seem to provide and definite results. So I went ahead and reflowed all the resistors in the circuit.

So far picture is stable, so I'm pretty sure it was just a cold joint on one of the resistors.

Thanks for the insight John.

As for the -5V

I have DP-156-01 2nd printing.
Not that I couldn't have missed it, but I've looked all over for the -5v and or optional components. Maybe I just need more coffee.

Kevin

On Wed, Sep 1, 2010 at 1:05 PM, Darren Finck <dgfinck@yahoo.com> wrote:

I recall a few months ago looking hard to find what the -5VDC was used for when I was trying to set up a "minimalist" bench test. It looks like it was only there for some optional type of ROMs (8316s?). Look at the "Vector Generator ROM section of the schems). My PCB did not have any populated locations connected to the -5VDC. I powered it up w/o -5 and it ran fine (including good video output to the o-scope).

Darren

--- On Wed, 9/1/10, Rodger Boots <rlboots2@gmail.com> wrote:

From: Rodger Boots <rlboots2@gmail.com>
Subject: Re: VECTOR: Battlezone and -5v
To: vectorlist@vectorlist.org

So the XY outputs can swing negative. On Sep 1, 2010 11:18 AM, "Kevin Moore" <talon.k@gmail.com> wrote:

Dumb question, what is the -5v for on BZ?

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Received on Wed Sep 1 16:58:02 2010