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This article is informative but wrong. The IBM 305 series was not a drum storage setup but was in fact the first production of a stacked disc hard drive, sporting 50 discs measuring 2 foot in diameter. — Preceding unsigned comment added by 65.25.19.64 ( talk) 18:14, April 8, 2006
Great article! Wrt to the thread above, it totally misses the point. The drum storage was analagous to the RAM storage of later (and contemporary machines). That (the active memory) and the overall place of the system in the evolution of computing (where the disk and drum highlight the narrowing that later occured in what was still a more fluid model of general computing) is the really interesting thing about it. Lycurgus ( talk) 18:58, 18 March 2009 (UTC)
I've read elsewhere that the date of announcement was September 4, 1956. The IBM reference agrees with this. So how come the article has September 13, 1956? This looks like someone has falsely made a correction for the change from the Julian calendar to the Gregorian calendar. (But that change would be more like 11 or 12 days. So I'm not really serious about that.) I think at least there should be some explanation of the discrepancy.
Alan U. Kennington (
talk) 05:05, 3 September 2011 (UTC)
One of the engineers on this system died, [2], not sure how to place this in the article.(mercurywoodrose) 99.157.206.37 ( talk) 04:12, 29 December 2012 (UTC)
@ Comp.arch: Our article said "Each character was 7 bits, composed of two zone bits ("X" and "O"), four BCD bits for the value of the digit, and an odd parity bit..." User:Comp.arch added the following comment to the code after that sentence: 'confusing or wrong, alphanumeric (unless only hexadecimal ones) need more that 4 bits. If preceding "BCD" means here 6-bit, then at least "four BCD bits" below for the core memory is confusing (and not the same as "6 data bits" for the " IBM 350 disk system" above in the lead.'
The sentence in question was confusing because BCD was used with two meaning. The RAMAC six-bit BCD code includes the two zone bits, mirroring the coding used on IBM punched cards, which includes a digit punch and one or more zone punches (rows 11 and 12). I changed the sentence to read: "Each character was 7 bits, composed of two zone bits ("X" and "O"), four bits for the binary value of the digit, and an odd parity bit..." -- agr ( talk) 21:59, 6 January 2016 (UTC)
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