Re: TECH Star Wars PCB

check the following:
74LS153 at location 6F and 7N can't rememeber the IC number.

----- Original Message -----
From: <jobrien@theobrienhouse.com>
To: <vectorlist@vectorlist.org>
Sent: Sunday, August 26, 2007 3:39 PM
Subject: VECTOR: TECH Star Wars PCB

>I have a Star Wars upright boardset that I am having some
> issues with. I am getting Matrix Errors:
>
> AFFFF
> B0000
> CFFFF
> DFFFF
> NNNF FNNN FFFF
> NNNF NFFF FFFF
> NNNF NFFN FFFF
> NNNF NFNF FFFF
>
> There are no ships or stars. The Screen also is about 1/3
> smaller than the actual monitor...
>
> I have a good / working boardset that I switched out the
> PROMs with and that had no effect so I know it's not the
> Mathbox PROMS.
>
> Looking in the manual I see that the Serial Subtractor (8b)
> is involved heavily with tests A,B,C,D so I am going to try
> to change it out. The manual also says that missing ships
> are most likely due to a bad Math Ready line but I don't get
> that error.
>
> So I am going to change out the IC at location 8b (Serial
> Subtractor). The Schematcs say this IC is a "LS385".
> Searching the internet essentially claims there is no such
> part as a "LS385". Looking at the actual boardset the IC at
> location 8b is labeled "AM25LS15PC"... Is this a typo on
> the schematics? I find it hard to believe that you could
> get the two numbers confused. When searching for AM25LS15PC
> I did find some hits but none of them crossed with LS385...
>
>
> Jono
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Received on Sun Aug 26 11:59:52 2007