These are less expensive drives and were meant to be directly connected as B drive to a CPC 464 with DDI-1 or a CPC 664/6128. Since these drives ship neither with an own controller nor a [[VDOS]] ROM, they do rely fully on AMSDOS and thus only 40 tracks on one side can be accessed, resulting in the same capacity (180K/side) as the 3" drives.
The === F1-Z models are based on a later revision of the BASF 6138 type disk drive (81757-001), which offers more configuration options using jumpers. The drive was shipped in a configuration to use only 40 tracks, and thus the cheaper and more widely available DS DD floppy disks (48 tpi5, 180K/side25") could be used. ===
=== Variants ===The F1-Z model is based on a later revision of the BASF 6138 type disk drive (81757-001), which offers more configuration options using jumpers. The drive was shipped in a configuration to use only 40 tracks, and thus the cheaper and more widely available DS DD floppy disks (48 tpi, 180K/side) could be used.
* '''F1-Z''' - single 5.25" drive
* '''M1-Z''' - single 3.5" drive
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<gallery>
Image:Basf 6138 81757 001.jpg|BASF AG 6138 (81757-001) drive
Image:Basf 6138 81757 001 jumpers.jpg|BASF AG 6138 (81757-001) 40 track jumper configuration
</gallery>
=== M1-Z (3,5") ===
The M1-Z model is based on a 3,5" disk drive.
=== A1-Z Upgrade Kit ===
