OSWORD &64 is the only one of VFS's OSWORD calls that doesn't have a direct equivalent in ADFS. It is a special call to implement a read of the F-code reply in the VP415's buffer. It's equivalent to using OSWORD &62 with SCSI op code &C8, but is slightly easier to implement as it does not need a SCSI command block setting up. We put &64 in the accumulator and point the X and Y registers to a block in RAM where the F-code will be stored and that's it.

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