(Topic ID: 331060)

Williams System 11 MPU boot issue

By csab00

1 year ago

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2 posts
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Latest reply 1 year ago by PINTEC
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High Speed Williams, 1986

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Quoted from csab00:
Hi!
I am trying to fix my High Speed MPU board.
With Leon Test eprom everything looks good all outputs of the PIAs are OK.
Memory tesy 6116 by pressing the switch also ok!
I was writing the eproms for high speed U26, U27.
Sometimes the MPU starts normaly on the small display shows 0.
Other occasions on the display 8 and 0 numbers are changing rapidly.
What condition come is totaly random...
My eprom burner is maybe not 100% but comparing the eprom content with the binary file it seems to be ok.
Could you give me an advice what to check?
Thanks in advance!

One eprom is burned on 27256 27 and the other 2764 26

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