Detecting inserted floppy drive WAS: Raymond Check discusses MS DOS Floppy Disk Cache

Chuck Guzis cclist at
Wed Oct 2 17:11:15 CDT 2019

On 10/2/19 2:07 PM, Ali via cctalk wrote:
> Just wondering if anyone (Chuck, Fred?) knows what is the exact technique referred to in this other post by Raymond?

Not enough information to know. It should be noted that one needn't spin
up drives to select them and poll them.   I wonder if this is the
difference between "drive ready" or "disk changed" on pin 34 of the


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