SD2IEC VCPU detector (from VCPU testcodes)
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Description from "VCPU guide":

A-DETECT:
  Prints the long version ("X?") of the found drive. Check
  for VCPU support ("ZI") and displays the response. After
  that it prints the number of buffer ("ZB") and the current
  state of the VCPU ("ZC").

Files:
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a-detect-20.prg		VIC20 version
a-detect-64.prg		C64 version
a-detect-128.prg	C128 version
a-detect-264.prg	C264 series (C16, C116, plus/4) version

Load the file for the desired platform, then launch it
with a RUN command! The program searches for the drive and
then prints the version informations and others.