October 1975
Approval is given to develop the Meridian processor (3033) at the IBM System Products Division Lab in Poughkeepsie, N.Y.

December 1975
IBM's East Fishkill, N. Y., semiconductor plant is asked to design a chip for Meridian with twice the switching speed and ten times as many circuits in the same space as that used in the System/370 Model 168. In addition, the Meridian chip is to have 43 circuit layouts compared to the Model 168's 18.

July 1976
Fishkill delivers its first Meridian logic modules to Poughkeepsie.

November 1, 1976
First Meridian "power on" at Poughkeepsie Lab.

March 25, 1977
IBM's Data Processing Division (DPD) announces the 3033 --- including Models U4, U6 and U8. Within three weeks, hundreds have been ordered.

Late 1977
IBM's Field Engineering Division begins training selected IBM customer engineers in 3033 installation and maintenance.

January 1978
Thirty-five 3033s are in various stages of completion (10 in assembly and 25 in test).

March 17, 1978
The first 3033 is shipped to Singer Company in Wayne, N.J. DPD President Terry R. Lautenbach says: "The delivery of these new processors, for which there has been unprecedented demand, is a significant event for us and for our customers."

March 30, 1978
DPD announces a multiprocessor version of the 3033, including Models M4, M6 and M8.

December 4, 1978
Models U12, U16, M12 and M16 are rolled out.

January 30, 1979
DPD announces the IBM 3033 Attached processor complex (Models A4, A8, A12 and A16).

November 1, 1979
Models N4 and N8 are introduced.

April 1, 1980
Models N12 and N16 debut.

June 11, 1980
DPD announces: (a) a new version of the IBM 3033 Attached Processor Complex offering up to 28 channels for added system capacity; and (b) hardware and programming enhancements making it possible for 3033 multiprocessor users to address up to 32 million characters of main storage.

October 10, 1980
Models N4, N8, N12 and N16 are rolled out.

November 12, 1980
DPD announces: (a) the 3033 Model Group S (S4 and S8), an entry-level 3033 processor; (b) Models U24 and A24; (c) an increase from 16 million to 24 million characters of main storage for the 3033 processor and attached processor; and (d) a no charge engineering modification that improves performance of the 3033 Model Group N five to 14 percent.

DPD says the Model Group S is available with six channels and four or eight million characters of main storage. It has a machine cycle time of 57 billionths of a second and offers performance more than double that of the IBM 3031 processor. The Model Group S can be upgraded to more powerful 3033 processor models as users' large-scale data processing requirements expand.

A four-million character Model Group S Processor Complex with processor, power and coolant distribution unit and operator's console can be purchased for $1.19 million. An eight million character version has a purchase price of $1.335 million. Under the terms of a four-year agreement, the system can be leased for $59,000 or $71,580, respectively, or can be rented for $64,901 or $78,739 a month.

October 21, 1981
Models S12 and S16 are introduced.

February 5, 1985
The 3033 is withdrawn from marketing.