be transmitted in any 0.0001 sec, interval, and therefore this requirement is easily met with conventional resistors and capacitors." The 8K core stores were getting fairly common in this country in 1954. The 32K store started mass production in 1956; it is the standard now for large machines and at least 200 machines of the size (or its equivalent in the character addressable machines) are in existence today (and at least 100 were in existence in mid-1959). 1955–1961 A search of the Computer History Museum's Stretch collection of 931 text documents dated from September 1955 through September 1961 shows no usage of k or K to describe main storage size. 1961 Quoted in OED as first instance of "kilobit", though "it is more usual" suggests it is already in common use (see timeline entry for 1957) Described device contains 512 words, 24 bits each (=12,288 bits) "It is no longer reasonable to spend as much time to transmit an 80 bit address as 12 kilobits of message information-a 1500 to 1 ratio.... We have theoretically and experimentally proved that speech can be compressed from the straightforward requirement for 48 kilobit PCM channel capability to 2400 bits by the application of the Dudley syllabic vocoder." The IBM 7090 Data Processing System (a binary machine), Additional Core Storage (65K means "approximately 65000") "The Additional Core Storage feature for the IBM 7090 Data Processing System provides a second IBM 7302 Core Storage, increasing the capacity of main storage by 32,768 words. The block of storage represented by both 7302 units is referred to as "main storage unit." "Additional core storage provides two methods of using main storage: (1) The 65K mode—the computer program is enabled to address both of the main storage units, and (2) the 32K mode—the computer program is able to address only one storage unit, so that main storage capacity available to that program is effectively 32,768 words." The IBM 1410 Data Processing System, which used modified decimal addressing, uses decimal arithmetic for powers of ten, without prefixes "Core storage units are available in 10,000-, 20,000- or 40,000-character position capacities." "The matrix switch makes it possible to address any one of the 100 X-drive lines (in a 10K core array)." "The 40K core array requires 40,000 valid five-position addresses from 0,000 to 39,999." "This operation check detects errors in programming that cause invalid addresses. Examples: 40,000-and-above on a 40K core