3.5" Altair CP/M

Grant Stockly grant at stockly.com
Sun Jun 3 16:11:11 CDT 2007


>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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