Re: BX720D Project

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.
Steve
       From: "silverdr@wfmh.org.pl" <silverdr@wfmh.org.pl>
 To: cbm-hackers@musoftware.de 
 Sent: Friday, November 28, 2014 4:09 PM
 Subject: Re: BX720D Project
   


On 2014-11-28 19:04, Steve Gray wrote:
> Hi all,
>
> After about 6 years I finally (well almost) completed my BX720D project.
> As you may know the CBM-II high-profile machines were planned to have
> built-in disk drives and 8088 coprocessor board. Well, Commodore never
> completed or released such a machine, although they did build all the
> parts needed to assemble one. Recently I was able to test one of the
> 8088 boards that I've had sitting around for 7 years and finally got it
> working, so I set myself to completing my project.
>
> The computer is a Commodore 710 with a 110V power supply, and 256K ram
> installed. The internal drives are taken from an 8296-D machine. They
> needed to be modified to fit into the CBM-II.

Nice - someone else had to finish the job CBM was once supposed to do. 
Just - why did you have to modify the drives? I could bet I have some 
machines of this style with internal drives in my storage. CBM did it. 
So basically the 8088 board would be missing. Or you just didn't have / 
wanted to do it on the particular machine you had at hand?



-- 
SD!

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