|Product Number: 2757A|
|Division: Palo Alto|
|Original Price: $23500|
|Catalog Reference: 1969, page 109|
The 2757A was the first disc memory available for use with HP computers. The 2757A provided 3.2 megabits (174,080 words) of storage with a transfer rate of 3 megabits per seconds and an access time of 33 ms maximum. The 2757A-01 was priced at $28,500 and provided 6.4 megabits (384,160 words) of storage.
In 1969, HP introduced the 2770A and 2771A disc memory solutions. The 2770A provided 184,320 words of memory with a transfer rate of 160K words per second and an average access time of 17.4ms. The 2770A was upgradable to the 2771A (priced at $30,000) which provided 368,640 words of memory. For an additional $12,000 the 2771A could be upgraded to 737,280 words of memory.
HP also introduced drum memory in 1968. The 2773A (priced at $30,000) provided 393,216 words of memory with a transfer rate of 120K words per second and an average access time of 8.7 ms. The 2774A was priced at $36,500 and provided 786,432 words of memory. The 2775A was priced at $61,500 and provided 1,572,864 words of memory. The 2773A and 2774A were each expandable to the next level of memory capacity. These products were made by Vermont Research Corporation.
The 2766A (disc memory) was introduced in 1970 and priced at $27,500 (along with the 2772A power supply). The base model offered 262,144 words of memory expandable up to 1,048,576 words. It provided a transfer rate of 118K words per second with an average access time of 8.7 ms.
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