Talk:BCD (character encoding)

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Merge? How does this differ from Six-bit character code?[edit]

Six-bit character code Peter Flass (talk) 13:54, 7 June 2012 (UTC)
BCD (6-bit) Peter Flass (talk) 13:55, 7 June 2012 (UTC)

There are many reasons for keeping BCD (6-bit) separate from Six-bit character code (I've used it for 35 years as System engineer at Bull, and it was a milestone)
  1. For the same reason we do not merge EBCDIC and ASCII - Seven-bit character codes (8-bit later on)
  2. Not to allow it to be confused with BCD..
  3. Six-bit character code is generic (trying to comprehend all others..among them Fieldata)
  4. Braille sixbit code it should go inside Six-bit character code, but may not be included in BCD (6-bit)
  5. It was the first Six-bit character code.. giving birth to its offsprings EBCDIC and ASCII
  6. Do you want to merge all 8bit code sets in one article?
  7. All code pages have separate articles.. Do you want to merge all code pages in one article?

(to be continued)--Mcapdevila (talk) 16:57, 18 June 2012 (UTC)

Fair 'nuff. Peter Flass (talk) 20:54, 18 June 2012 (UTC)
According to Wikipedia (which of course must be correct) Fieldata is a 7-bit code. As far as I can see there are no articles Seven-bit character code or Eight-bit character code, just six-bit. Peter Flass (talk) 12:34, 19 June 2012 (UTC)
On the other hand, as far as I can see there are no articles Seven-bit character code or Eight-bit character code, just six-bit. The other major code pages each have their own article. I recently added an article on IBM Transcode, which is a different 6-bit code and there are probably others. Do we need a generic article for six-bit codes?Peter Flass (talk) 12:42, 19 June 2012 (UTC)
See talk for Six-bit character code. Is the definition of BCD a character set where the digits 0-9 have binary codes 00 thru 09? This article should say that. The article Binary-coded decimal covers the arithmetic details of BCD.Peter Flass (talk) 12:48, 19 June 2012 (UTC)
Fieldata (as per 1956) was a sixbit code: "Fieldata is the original character set used internally in UNIVAC computers of the 1100 series, represented by the sixth of the 36-bit word of that computer."--Mcapdevila (talk) 18:07, 19 June 2012 (UTC)
I think it will be no need for the Six-bit character code article, in the moment all the included code systems they have its own article, as the other families. In the mean time they have to appear somewhere.--Mcapdevila (talk) 18:55, 20 June 2012 (UTC)\
Makes sense.Peter Flass (talk) 20:11, 20 June 2012 (UTC)

Per Wikipedia:Merging, proposed merge discussions should take place on a single page. As I was confused by the separate discussion at talk:Six-bit character code, I took the liberty to merge it. Thanks, Wbm1058 (talk) 17:36, 19 October 2012 (UTC)

I guess there's no reason to merge and some reason not to, so I removed the merge proposal. I see the distinction between various BCD codes and other codes. Confusingly most 6-bit codes are called BCD even where this is incorrect. I did decide to "be bold" and made changes to this article, the most significant being discussion of the development of BCD based on information from Punched card and Binary-coded decimal. Peter Flass (talk) 14:06, 31 December 2013 (UTC)

Definition of BCD[edit]

To distinguish BCD from other six-bit codes I added the following: "BCD encodes the characters '0' through '9' as the corresponding binary values". Peter Flass (talk) 23:50, 31 December 2013 (UTC)

I backed this off because some BCD character sets seem to have zero in another position. Does anyone have access to the Mackenzie reference? What the heck is his definition of BCD? Peter Flass (talk) 23:46, 3 January 2014 (UTC)
I guess this is not true. I've done some research and there are a number of BCD encodings. Peter Flass (talk) 00:09, 16 February 2014 (UTC)

Two commas in IBM 704 BCD[edit]

Does it really contain two commas and no period? Well, I've seen stranger things, but if so, the table should annotate this explicitly as a bizarre anomaly. — MaxEnt 10:36, 25 June 2014 (UTC)

Good catch, thanks. Peter Flass (talk) 11:03, 25 June 2014 (UTC)