HP85 Repairs and EBTKS


EBTKS is a new (2021) interface card for the Series80 desktop computers, including the HP85A, HP85B, HP86A, HP86B, HP87, and HP87XM

Capabilities include:

  • Tape drive replacement

  • ROM Emulation

  • Disk drive using SD Cards

  • POSIX like file system including subdirectories and logn filenames

  • Over 70 new keywords added to the BASIC language

Philip’s HP85 repair site

These pages document in as much detail as possible my experiences and results of repairing and restoring a HP-85A and HP-85B desktop computers.

Topics include:

  • Tape drive repair

  • Magnetic tape repair

  • Manufactured a replacement for the plastic optical servo disk for the tape drive

  • Reverse engineering the tape drive signals

  • Keyboard key stem repair

  • Modifying incompatible key stems to work in HP85 keyboards

  • Manufacturing Flat-Flex Cables

  • Tools and materials