15 May
2007
15 May
'07
6:23 p.m.
At 05:09 PM 5/15/2007, you wrote:
At 04:45 PM 5/15/2007, you wrote:
The crystal has also been changed from (I think) 4MHz to 2MHz.
There are cut traces, changed resistors, etc... I'll scan the mdoifications.
Grant
On 5/15/07, Grant Stockly <grant at
stockly.com> wrote:
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. 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.