Re: Tempest schematic error?

Yes, F5 pin 1 should be tied to R15 same as F5 pin 2.
Check the board, pins 1 and 2 of F5 should be connected.

Battlezone uses this same Vector-Generator Data Shifter.
Look at the Battlezone schematics they are correct.

Tim

-----Original Message-----
>From: Mathis Rosenhauer <rosenhauer@dkrz.de>
>Sent: Dec 1, 2009 8:54 AM
>To: vectorlist@vectorlist.org
>Subject: Re: VECTOR: Tempest schematic error?
>
>David,
>
>I stumbled across the same thing when I rewrote the vector generator for
>mame. According to the schematics !LATCH1 is used for both clearing and
>latching DVG0-3 into F5 which doesn't make sense. IMO F5:1 should be pulled
>high the same way they did it with J7:1.
>
>Cheers,
>Mathis
>
>
>David Shoemaker wrote:
>> I was working on one of the boards today and noticed something odd.
>> According to DP-190-03 2nd printing
>> Sheet 3 side A
>>
>> !Latch 1 runs to all the LS194's used as part of the Vector-Generator
>> Data Shifter. This should go to pin 1 on each (D5, D6, E5, H5, H6 & F5)
>>
>> But as I was probing all the chips to ensure they were getting signal (I
>> am not getting any vectors out on this board). I found that Pin 1 on F5
>> is not getting toggled like the rest are. Figured that it was a broken
>> trace somewhere. But in looking over the board I can't see any problems
>> in that area. I check continuity between F5:1 and any of the others and
>> get nothing. But it is there between all the others.
>>
>> I then checked this on a known good board. Same thing. F5:1 does not
>> connect to the others.
>>
>> Anyone else noticed this? Or have any idea what F5:1 should connect to?
>>
>> Thanks,
>> David
>
>
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Received on Tue Dec 1 15:33:03 2009