ATR8000

Since CP/M machine discussion came up... I have an ATR8000. In addition, it has a (forgot brand) board that goes between the cpu and the mainboard and gives it a SASI ? interface. I also have a Xebec bridgeboard (S1410?) to then convert that to MFM. The only thing I didn't get was the MFM drive (it had long since be recycled by the previous owner into a PC). What I never was able to figure out was how to low level format the HD ! I don't know that I have the formatter. (Either that or it is there and I simply don't know how to use it). I would love it if someone could fill in that long outstanding blank for me... Also, any idea if a SCSI drive could be hooked up in lieu of the Xebec and MFM drive ? I know SASI and SCSI1 are close... but I don't dare do this till I know it will work (don't want to toast the hardware). -- Curt