3.5" Altair CP/M

[Grant Stockly]

At 04:45 PM 5/15/2007, you wrote:
>On 5/15/07, Grant Stockly <grant at stockly.com> wrote:
>>I have a tarbell floppy controller card that has been rewired to access
>>3.5" disks using a standard PC 3.5" disk drive.  I have 3 disks that the
>>Altair can boot off of and read, but my windows computer can't do anything
>>with them.  I've tried rawread.exe and diskinfo.exe and they both choke on
>>the disk.  I assumed that if a disk could be written with the standard 3.5"
>>disk drive on the tarbell card then it should also be read on the same
>>drive connected to a modern IBM compatible.
>
>Are you using a 1771 based SD Tarbell card, or a 1791/1793 based DD
>Tarbell card?  That might make a difference.

Its an MDL-1011D with an FD1771-B01.

What's the deal with this chip?  Is it formatting the the disk as 360k?

I can scan the modification sheet and card if anyone is interested.  I'd 
really love to make a disk image of the disk to share with people.  I might 
have to write a bootstrap program that reads from the serial port and 
writes to a disk.

Grant