The 9866A was designed for the 9830A computer. Because of its versatility, this printer was also connected to other HP computers including HP 1000 systems, 9825 and 9845. It was a character-only printer with a maximum print speed of 250 lines per minute. It printed characters (upper case only) in a 5 x 7 dot cell matrix. The 9866B was introduced in 1976 at a price of $3350 (by which time the price of the 9866A had increased to $3145). The 9866B had a 95-character set (including lower case characters), compared to the 65-character set on the 9866A. The 9866B could also print graphics at 400 dots per row.