5.25 floppies that read but don't write

[Chuck Guzis]

On 08/18/2015 09:05 PM, Marc Verdiell wrote:
>
>
> I have connected a 1.2M 5.25" floppy to my computer. After a bit of
> jumper learning and setting, it's recognized and reads my old DD and
> HD floppies fine. But for the life of me I cannot write to it. Not
> under DOS, Win98, or WindowsXP. Which all read fine.

Make sure that "WRITE GATE" goes low (use a logic probe) on pin 24 of 
the drive while you do your write.  If so, your floppy write circuitry 
has a problem.  I.e., it's not the cable.

--Chuck