SFD-1001

Serial: GA4 006126

The SFD 1001 is a single-drive, low profile version of the better known 8250 IEEE-488 disk drive capable of storing 1MB per floppy disk, powered by CBM DOS 2.7

• total capacity: 1.066.496 bytes per disk (4133 blocks)
• coding: GCR
• format:
  • 154 tracks (77 per side)
  • 23-29 sectors per track
  • 256 bytes per sector
• DOS: 2.7
• ROM: 16Kb DOS, 2Kb GCR, 2Kb FDC-ROM
• interface: IEEE 488
• 2x 6502: CPU
• 2x 6532: RIOT
• 1x 6522: VIA
• 1x 6530: MOS 901885-04: RAM, ROM, I/O, Timer RRIOT
• 8x 2114: 4Kb RAM
• disks used: standard 5,25″ DS-QD, 100TPI

work performed:

• completely disassembled and cleaned
• motor PCB recapped and wrong caps from previous owner removed (pictures show the PCB before recapping)
• floppy mechanics cleaned and lubed
• r/w heads cleaned