Re: Tempest Schematic error?

I've looked at 3 boards, working boards, and they are all the same.

On Sat, Jun 26, 2010 at 9:32 PM, Kevin Moore <talon.k@gmail.com> wrote:

> Versions 1, 2, 3 all show the same thing. Looks like a cut and paste. Pin 1
> definitely get's hooked to pin 2 solder pad joining them. I would have never
> noticed, but I have a video problem, and I was only getting DVY8-11. When I
> started probing I noticed that pin 1 was high on F5, but not on any of the
> other Ls194 chips. So that got me off on a wild goose chase trying to figure
> out why pin 1 of the rest of the circuit wasn't connected to F5 pin 1.
>
> In any case, none of my latches are toggling, nor any of the states going
> into f7.
>
> So now I'm doing the logic probe shuffle in circles.
>
>
> On Sat, Jun 26, 2010 at 9:18 PM, Kevin Moore <talon.k@gmail.com> wrote:
>
>> Yeah it's an ls194 alright. But the board/s I am looking at all have pins
>> 1 and 2 shorted.
>>
>>
>>
>> On Sat, Jun 26, 2010 at 8:52 PM, Rodger Boots <rlboots2@gmail.com> wrote:
>>
>>> Printing 1 schematics show same thing, no pin 1-2 connection and chip is
>>> an LS194.
>>>
>>>
>>> On Sat, Jun 26, 2010 at 8:48 PM, Rodger Boots <rlboots2@gmail.com>wrote:
>>>
>>>> The schematics I pulled up say F5 is an LS194 with pin one being LATCH1
>>>> (inverted) and pin 2 going to P R15. But there is a connection dot at pin 1
>>>> and I am using printing 2 of the schematic, so on printing 1 they MIGHT have
>>>> been incorrectly connected together.
>>>>
>>>>
>>>> On Sat, Jun 26, 2010 at 6:33 PM, Kevin Moore <talon.k@gmail.com> wrote:
>>>>
>>>>> So I was looking through the schematics today, and it seems that there
>>>>> is a problem in the vector-generator data shifter section. Specifically with
>>>>> F5. Perhaps I'm just confused, so I thought I would ask and see. But it
>>>>> looks to me like pins 1&2 are tied together. Instead of having /Latch1 going
>>>>> into pin 1.
>>>>>
>>>>> Also could someone explain to me what the P,R15, and P,R31 lines are?
>>>>>
>>>>> Thanks,
>>>>>
>>>>> Kevin
>>>>>
>>>>>
>>>>
>>>
>>
>

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Received on Sat Jun 26 22:32:54 2010