8250 LP [#3]

8250 LP

Serial: 4002773

A Dual disk drive that was sold as a companion to the 80xx-SK range of computers. The LP stands for Low Profile, as the machine is considerably less tall than the 8250.

  • total capacity: 1.066.496 bytes per drive (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
  • both motor PCBs recapped and damage from leaked caps repaired
  • floppy mechanics cleaned and lubed
  • r/w heads cleaned
  • bottom case half retro-brighted -> see before pictures for comparison

Finished:

 

Before/Disassembling:

 

Damage Control: