[Techtoolslist] Looking for Fluke 9010a U62 (82S123) PROM Image

[William Stillwell]

just read a working one?

https://forums.arcade-museum.com/archive/index.php/t-265230.html



William Stillwell

Board Member - Inspiration labs, Inc. a 501c3 organization

Board Member - West Central Florida Group, Inc. a 501c3 organization

Board Member & Co-Founder - Byte Amusement Group // Free Play Florida
Arcade & Pinball Show a 501c3 organization

Board Member - Clearwater Amateur Radio Society

On Thu, Aug 3, 2017 at 4:49 PM, Grant Goodes <grant.goodes at gmail.com> wrote:

>    Hi list-members,
>    A friend has a Fluke 9010a that won't boot.  After finally tracking
>    down a z80 pod, we used my functioning 9010a to do some debugging
>    (using information in the Service Manual), and figured out that the ROM
>    at 0-3FFF was colliding with the ROM at 4000-7FFF: When you try to read
>    address 4000, you get the contents of address 0.  Schematic spelunking
>    implicates the Memory Page Selector chip U62 which is a 82S123 PROM.
>    We could just replace the PROM, but I've not been able to find the
>    image-file for this one.  Does anyone have an image-file for U62, or
>    even better a spare U62?  A local guy in Ottawa can burn this PROM for
>    us, but then we'd need the image!
>    We will of course do some more debugging: In particular, we need to
>    trace the ROM chip-select signals back through to the z80 with the
>    9010a in Read-mode/loop, but ran out of time in our late-night
>    debugging session last night.
>    Thanks for any help: Would be great to get my friend setup with a
>    working 9010a!
>    grant..
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