Re: sega outrun stuck in reset

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<x-charset utf-8>Pulling the roms and testing them in a programmer is only part of the test.
Now with those roms on your PC load up FIDE and get it to produce fluke rom
signatures for them.

Then put them back in the board and ensure that you can get your fluke to
romcheck the roms in situ to the signatures that you produced.

Once you can get to that stage then you know that not only the roms are good
but also the buffers and any other ICs that make up the circuit in between
the CPU and the roms is also good. By then you can start looking at ram and
stuff...

Martin.

On Sunday 24 April 2005 19:28, tony wrote:
> i can not get the board to run at all it is stuck in a reset
> if i tie the hault and reset high i still can not get the 9010 to go past
> the first address something is sending a rest pulsing and the screen just
> flashes with garbage lines on it i pulled all roms and checked them in a
> programmer
> and tried swaping out the proms with ones on a known good board
> also swapped the cpu board with a know good one so i know the problem is in
> the cpu board and the video board is good
> i tried to bug trap all ttl 7400's in the reset circuit and replace any
> thing i found bad some 74ls116's is this a ram problem ?
> i am using a afterburner schematic i can not find the outrun one the cpu 1
> should be on the outside right ? how can i get the fluke to run to get this
> fixed
> thanks
> tony
>  

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Received on Sun Apr 24 18:05:39 2005