HP 9825A

This beautiful device is a 16 bit calculator from 1976. Its CPU is a work of art, as are the internals of the machine.

Parts:

• Arrival from France and pictures
• Initial checks of the machine

Repairs

• Tape card repair
• Converting to 9825T
• Converting the tape unit for DC2000

Extension cards

• The 98034B HPIB adapter
• The 98032A GPIO (16 bit Parallel input/output card)

Information

• Error message list (copied from the badly readable error message booklet)