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Re: [Amps] Alpha

Subject: Re: [Amps] Alpha
From: Tom Osborne <>
Date: Thu, 5 Oct 2017 16:05:59 -0700
List-post: <>
Where are the codes in my SB-200?? :-)  73

On Thu, Oct 5, 2017 at 1:46 PM, Jerry <> wrote:

> There was a site up for a few years that said all of the amp specific data
> resided in 64 hex bytes beginning at B600.  He recommended using the ZOC
> Terminal from  and had a nice simple script to read
> and
> copy the memory contents.  I have done this for my 3 amps and can share the
> info on request.  I asked a few days ago whether Mike would release the
> code
> to public and got a reply from Glenn:   " In the 87A the operating code is
> programmed in U7 (a PROM) and U9 (a PAL).  When the 87A is plugged in and
> the AUX 5v comes up the 68HC11 microprocessor loads the code and runs.  We
> don't have the source code for the 87A that I know of.  We have hex files
> for programming the PROM and various PALs used in the amp."
> I am pretty sure the 68HC11 still needs a bootstrap program/firmware
> directing what and where to boot from but maybe that is already hardcoded
> into the 68HC11 - will need to look at the Motorola manual.  I think the
> most difficult is reconstructing the PALs, these are typically fused closed
> to reading after being programmed.  I hope one day these can all be made
> public
> 73
> Jerry, NY2KW
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