->  MR> All, hdc's in the early days MFM, RLL, ESDI (esdi is really rll) had
->  MR> the ll format utility burned in its eprom programming and it was
->  MR> accessed by jumping to the execution address entry point using DEBUG.

->   I was not aware of this capability in the old days. I had one MFM drive at
->   the start but never even needed to format it.

 I still have my old Adaptec RLL HD controller. The instructions called
for using DeBug.  G=C800:CCC     :-)
It was a FULL length Card, 13 1/2 Inches long too. :-)
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