3.5" Altair CP/M

Dan ragooman at comcast.net
Sun Jun 3 18:19:31 CDT 2007


Grant,

I think this is a cool idea.
I'd like to help out in any way I can.
Either with the design, schematics, etc.

=Dan

[ beauty is in the eye of the beer holder  ]
[ cruising in cyberspace with no brakes    ]
[ http://ragooman.home.comcast.net/        ]



Grant Stockly wrote:
>
>> The "media type" hole on a 1.4M?
>> There exist some drives that ignore the "media type" hole, pqrticularly
>> many/most? of the ones that IBM used in the PS/2s.  They rely on the 
>> disk
>> controller board to tell them when to go to reduced current.
>>
>> or the index hole on a 5.25"?
>
> The type hole on a 1.4M disk.
>
>> Did 1.4 support the DSK option of STAT?  It gives some more info 
>> about the
>> format.
>> If so, try
>> B:
>> A:STAT DSK:
>
> No, but I did find a program:
>
> TARBELL MINI-FLOPPY DIAGNOSTIC OF 8-1-80
> STANDARD VERSION 1.8
> 40 TRACKS    18 SECTORS
>
>> \Most PC floppy controllers will not handle FM/Single density.  Use 
>> Dave's
>> test program on your PC to see if you have a chance.
>
> What I would really like to do is find some way of connecting a 3.5" 
> disk drive to the MITS hard sectored controller card set.  This would 
> give me the 300 or so K and allow me to run MITS basic off of the 
> disk.  Do you know anything about how to do that?  Is it possible?  
> Maybe with a PLD to deal with soft/hard sectored stuff?
>
> I have not investigated anything yet so I am not sure what it would 
> take.  If its possible I'm sure I could get it done.
>
> Grant
>
>
>



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