The 2640A was successful from the very beginning. In December of 1974, HP received 151 orders valued at $500,000, about eight percent ot the total value of orders received by all of the Data Systems Division that month. HP received 317 orders for the 2640A the following month, accounting for twenty percent of the division's total business. HP shipped 3000 of the 2640A terminals in the first year.

The 2644A was introduced in 1975 for $5000 and included two mini cartridge tape drives. The 2644A was replaced by the 2645A ($3,500 without tape drives, $5,100 with two tape drives) in 1976. The 2645A was the most common of the 264X terminals.

The 2641A APL/ASCII terminal was introduced in November of 1976 and priced at $4,100. The 2645R was introduced in April of 1977. The 2645R included Arabic characters and was priced at $4,350 (without tape drives).

The 2649A was introduced in 1977, priced at $2150. The 2649A was programmable and much like a personal computer, although it omitted the tape drives. The 10,000th 264X terminal was shipped in April of 1977. The 2648A was introduced in July of 1977 for $5500 and added graphics capability to the 264X terminal series. Graphics mode provided a resolution of 360 by 720 dots. The 15,000th 264X terminal was shipped in October of 1977.

The 2647A was BASIC programmable and introduced in May of 1978. Priced at $8,300, it included the dual tape drives and had graphics capability.

The 2649D was designed specifically for use with HP 250 computer systems. The 2649D and 2622D are the terminals that can be used to boot the pedestal version of the 250.

The 2642A was introduced in 1980 and priced at $6,750. The 2642A was compatible with the 2645A and came with a 5.25-inch floppy disc drive.
The 2647F was introduced in June of 1982, priced at $9,950. This graphics terminal included a 5.25-inch floppy disc drive along with BASIC and AUTOPLOT software.

The 264X terminals were very successful for HP. By the middle of 1981, HP had shipped over 60,000 units. The 2640 was the highest ranked terminal in a Data Decisions May 1981 survey of terminal users.

Sales of 264X terminals were affected by the introduction of the 262X terminal beginning in 1979. The 264X terminals lasted another five years. Most were obsoleted in January of 1985 (although the 2647 continued on as a 3000 system console).

The 2645A was also a movie star. It made an appearance in the 1976 movie The Casandra Crossing.