The 85B Personal Computer combines an alphanumeric keyboard, CRT screen, thermal printer, tape drive, user read/write memory, and a ROM based operating system in one portable package. There are 64 kbytes of memory built into the 85B. Of this, 32 kbytes are directly addressable as user-available read/write memory. The other 32 kbytes, called Electronic Disc memory, are indirectly addressable via built-in mass storage commands. There's a 48K ROM operating system and 8K of display memory . The typewriter style keyboard includes eight user-definable keys which make it easier to write, execute, and control your programs. You can use the built-in printer to produce hard copy of your results and you can take along both data and software on tape cartridges (not included) that run on the built-in tape drive. Four I/O ports on the back allow easy interfacing to peripherals and instruments.

We do a real basic test only, nothing in depth.  It is sold As-is no warranty.