<Not true! < <Altair Mini-Disk BASIC was distributed on 5 1/4" hard-sectored disks with 1 <sectors (not 10). The MITS controller consisted of two S-100 cards that wa <mostly TTL (nothing fancy like a 1771 No. The original disk for the altair before they became Pertec Computers was an 8" system using two boards of TTL. I know I built three of them in that era and debugged a few more. All if the later Pertec machines with minifloppies had a board that used a 1771 plus a raft of ttl. I might add the Pertec controller was sold before the Pertec aquired MITS. Allison