The HITAC M-200 Series was a general-purpose machine developed as the successor of the early models of the M Series (such as the M-180, M-170) with the aim to achieving an improved performance/cost ratio, and incorporating the latest features.
The high-end models, the M-280H and M-260H, were based on technology developed for the M-200H, and they achieved higher levels of performance and functionality by using newly developed technology, such as world leading logic-in-memory, 4Kbit/7ns high-speed bipolar memory, 550/1500gate LSI and platters which increased the degree of integration to 18 levels. Due to their outstanding cost-performance, these models were exported in large numbers to Europe and the US, where they enjoyed an outstanding reputation. For scientific and engineering calculations, the M-280H was equipped with high-speed arithmetic mechanisms and a built-in array processor.
The M-280H had 3.5 to four times the processing power of the M-180. The M-280D, which had about one-third the processing power of the M-280H, was field upgradable to an M-280H machine. The M-260H had 3.5 to four times the processing power of the M-170. The M-260K had about 1.3 times the processing power of the M-260H, and the M-260D had about one-fourth the processing power of the M-260H. The M-260D was field upgradeable to either the M-260H or the M-260K, and the M-260H was field upgradeable to an M-260K machine. Hitachi added the lower-end models M-240D, M-240H, M-220D, M-220H, and M-220K, forming a new family under the M series. The M-220D, M-220H, and M-220K processor group was field upgradeable to more powerful models at the installation site.
|No. of CPUs||1||1||1|
|Main memory capacity||1 to 8 MB||1 to 8 MB||2 to 8 MB|
|No. of channels||3 to 5||3 to 5||3 to 8|
|Announcement date||March 1983||June 1982||March 1983|
|No. of CPUs||1||1|
|Main memory capacity||2 to 16 MB||2 to 16 MB|
|No. of channels||3 to 8||5 to 8|
|Announcement date||March 1983||June 1982|
|No. of CPUs||1||1||1|
|Main memory capacity||8 to 32 MB||8 to 32 MB||8 to 32 MB|
|No. of channels||8 to 32||8 to 32||8 to 32|
|Announcement date||February 1983||October 1981||February 1983|
|No. of CPUs||1-4||1-4|
|Main memory capacity||16-64MB||16-64MB|
|No. of channels||8 to 32||8 to 32|
|Announcement date||February 1983||February 1981|
The M-220X models, successors to the M-220H, were developed as computer systems to provide integrated office automation systems for the new media age. The four models — M-220DX, M-220HX, M-220KX, and M-220LX — were field upgradeable to more powerful machines at the installation site.
This family offered improved reliability, a smaller footprint, and less power consumption due to the extensive use of LSI chips, including high-speed 1,500-gate LSI chips for the main logic circuits, CMOS gate-array LSI chips with 24,000-gates per chip that provided the peripheral control circuits with much faster speeds and dramatically less power consumption, and 256-kilobit DRAM chips for the main working memory. Space was also saved because a dedicated console was not needed.
|No. of CPUs||1|
|Main memory capacity||4 to 16 MB||8 to 16 MB|
|Maximum no. of channels||8|
|Announcement date||October 1985|