[Coco] Megaread problems

[Robert Gault]

Something very strange is going on with the version of megaread in the current NitrOS-9 builds. The 
program works correctly for Dave Philipsen and possibly everyone else. It fails for me on any system 
I try.

megaread 1 </DD

The above should run the program for the minimum number of reads with standard input changed to /DD. 
For MESS, VCC, and a 512K Coco3 the result is error #214.

megaread </DD
Same error as above for the default 1024 repeats.

The crc for the version under test is $A5A49C, size $7A which is identical with the nightly build 
version. Attr for tested drives indicates normal values.

Robert