Uses the same Adapter ID and ADF as IBM's MFM (and ESDI?) controllers.
"The POS register implementation is identical to that of the IBM MFM controller."
INSTESDI.EXE Install utility for the ACB-2620
Adaptec ACB-2600 Series OEM Manual
Adaptec ACB-2610 MFM
Adaptec ACB-2620 ESDI
Adaptec ACB-2610 MFM

Adaptec ACB-2620 ESDI

Appears to be the same board as ACB-2610, minus the AIC6225 and AIC250 parts.
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