Re: BX720D Project

On 2014-11-29 00:10, Steve Gray wrote:
> Hi,
>
> The 8296-D machine has these drive mechs, however the analog board is
> mounted behind the digital board and on an angle. This is no problem for
> the 8296 because the power supply is mounted on the bottom of the case.
> The CBM-II machine however has a larger motherboard (pic 8) and so the
> power supply is mounted on the top in exactly the same location that the
> analog board would be. So I had to remove the metal bracket that held
> the analog board on (pic 1) and find an alternate location for it. I
> decided that the analog board would mount between the case top and the
> power supply (pic 6) but in order to do that I had to remove a plastic
> mounting post for the power supply (pic 4). The CBM-II machines do not
> have power connections for the 8296D drives so I had to construct a
> cable (pic 10). They also do not have an internal IEEE connector so I
> had to wire the ribbon cable directly to the CBM-II motherboard (pics 8
> and 9).
>
> The result is pic 15 and 16 ;-)
>
> These machines you have in storage, are they CBM-II machines or are they
> 8296D? If CBM-II I'd be interested in seeing pics. It's possible that
> Commodore had some prototype machines in the labs when they went under.
> I know some 710D and 720D machines were found, but I believe they were
> just custom modified like I did and not real production machines.

I don't think they are this kind of rare treasures you mention. I guess 
those are the 8296-Ds. Can't be sure now as most are difficult to access 
but If I get to them - shall have in mind to check. But now I understand 
that the modifications were required due to different layout and 
mounting of the PCBs in relation to the drives.

-- 
SD!

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