[net.micro.6809] Speed POKEs and Disk troubles

knudsen@ihnss.UUCP (09/30/83)

My Coco goes totally blank after a POKE &HFFD7,0 when the disk
controller is in.  What's weird is that my machine handled that
and the &HFFD9 poke beautifully w/out disk, even before I cut
those two infamous caps out.
Do I have a slower-than-average ROM in my controller, or what?
Other Coconuts don't have this problem.
Any ideas?	mike k