Vectorlist Archives: RE: Asteroids jaggies (AR1 bench testing)

From: David Shoemaker <davids_at_oz.net>
Date: Sat Apr 14 2012 - 19:52:23 EDT

Ok for future reference.

If you put an AR2 on the bench and connect 10 vdc in you will get something
around 5.5 v on the output.

If you put an AR1 on the bench and connect 10 vdc in you will get 9.5v
output. The sense circuit is completely confused if there is no feedback
and it goes max output.

I built a quick "sense disable" plug from one of the 9 pin AC voltage
selection plugs that never gets used and jumpered 1-3 and 5-9. Now when I
turn on the AR1 it comes up with right around 5v as expected.

David

From: owner-vectorlist@vectorlist.org
[mailto:owner-vectorlist@vectorlist.org] On Behalf Of David Shoemaker
Sent: Saturday, April 14, 2012 3:55 PM
To: vectorlist@vectorlist.org
Subject: RE: VECTOR: Asteroids jaggies

Now all I have to do is figure out why the AR1 is seemingly stuck at 9.5v

I have replaced the Tip32, the 2n3055 and the LM305, checked all the diodes
and resistors and no change.

From: owner-vectorlist@vectorlist.org
[mailto:owner-vectorlist@vectorlist.org] On Behalf Of Kevin Moore
Sent: Saturday, April 14, 2012 2:58 PM
To: vectorlist@vectorlist.org
Subject: Re: VECTOR: Asteroids jaggies

Well that only leaves $21 more..

On Sat, Apr 14, 2012 at 4:02 PM, David Shoemaker <davids@oz.net> wrote:

Bad bet Douglas, X Dac (pulled one off of another board to test).

You can paypal the $1 to my email account :)

David

-----Original Message-----
From: owner-vectorlist@vectorlist.org
[mailto:owner-vectorlist@vectorlist.org] On Behalf Of Douglas Gauck
Sent: Saturday, April 14, 2012 7:27 AM
To: vectorlist@vectorlist.org
Subject: Re: VECTOR: Asteroids jaggies

I bet $1 it's in the X position counters. Note the different width of the
zeroes.

-Douglas

Sent from my iPhone

On Apr 14, 2012, at 8:20 AM, Tim Iskander <timiskander@gmail.com> wrote:

> board
> My guess would be something in the DAC circuitry.
> /Tim
>
> On Sat, Apr 14, 2012 at 1:28 AM, David Shoemaker <davids@oz.net> wrote:
>> monitor or board?
>>
>
>
>
> --
> Yeah... that'l work ;-)
>
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