[sdiy] Juno 106 repair, and maybe mods

[Senso]

>Some of the answer to this likely lies in the firmware ROM. On my 106s
>the firmware is apparently burned into the MCU, I don't have a logic
>analyser or anything clever to read it out of there. I saw on the PCB
>though that there are pads for EPROMS near both MCUs which aren't used.
>It appears that one version of the MCU has the firmware built-in, and
>another version uses an external EPROM. What I wonder is whether or not
>these MCUs will load the code from an external ROM if one is present.
>CJ

IIRC it's a question of one of the legs of the CPU having a 
connection to an Eprom or not. If nothing is there, it will revert to 
it's internal program. You'll have to find a Juno that has the Eproms 
to find your firmware, edit it and just plug your own Eproms in.
Sounds simple. Usually that means it isn't. :-)

Senso

-- 

----------------------------------------------------------------
................... VINTAGE PLANET ..................
.................. The Last Resort for ..................
... parts, books, manuals, sounds and more ...
............. http://www.vintageplanet.nl ............
----------------------------------------------------------------