.. HP85 repair and EBTKS documentation master file ********************** HP85 Repairs and EBTKS ********************** `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