Talk:Accumulator (computing): Difference between revisions
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== What is "early" == |
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[[Accumulator (computing)#Accumulator machines|#Accumulator machines]] says {{tq|Almost all early computers were accumulator machines with only the high-performance "[[supercomputer]]s" having multiple registers.}} However, the [[IBM 7070]]<ref>{{cite manual |
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| title = Reference Manual IBM 7070 Data Processing System |
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| date = January 1960 |
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| edition = Second |
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| id = A22-7003-01 |
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| url = http://bitsavers.org/pdf/ibm/7070/A22-7003-01_7070_Reference_Jan60.pdf |
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| publisher = IBM |
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}} |
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</ref> had three accumulators, the [[UNIVAC 1107]]<ref>{{cite manual |
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| title = Technical Bulletin Bulletin UNIVAC 1107 Central Computer |
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| id = UT-2463 |
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| date = November 1961 |
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| url = http://bitsavers.org/pdf/univac/1107/UT-2463_CPU_Nov61.pdf |
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| publisher = Remington Rand Univac division of Sperry Rand |
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}} |
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</ref> had 16, the [[Digital Equipment Corporation|DEC]] [[PDP-6]]<ref>{{cite manual |
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| title = Programmed Data Processor-6 Handbook |
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| id = F65 |
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| date = August 1964 |
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| url = http://bitsavers.org/pdf/dec/pdp6/F-65_PDP-6_Handbook_Aug64.pdf |
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| publisher = DEC |
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}} |
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</ref> had 16 and, of course, the [[IBM System/360]] had 16 general registers. The 1107, PDP-6, S/360 and their successors were popular in the 1960s and 1970s, and that era was dominated by machines with multiple accumulators. So where is the cutoff for "early"? --[[User:Chatul|Shmuel (Seymour J.) Metz Username:Chatul]] ([[User talk:Chatul|talk]]) 22:54, 25 July 2021 (UTC) |
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{{reflist-talk}} |
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Revision as of 22:54, 25 July 2021
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 | This article is based on material taken from the Free On-line Dictionary of Computing prior to 1 November 2008 and incorporated under the "relicensing" terms of the GFDL, version 1.3 or later. |
Massive rework needed
This is bad, really bad.
First of all this article suggests an accumulator processors has one accumulator (which 6502 did). However numerous examples are contrary to this such as
- 6809 has accumulators A and B that could be concatenated to D, 6308 had even more
- 56300 has again 2 large accumulators of extended width
- 96000 also has 2 accumulators that are even wider
With 2 accumulators you need only a single bit in the instruction to indicate what accumulator is to be used. 68000 has a lot of data registers, and those are not called accumulators, so the article should state clearly where the limit is. Seems the limit is around 4 (ARM Piccolo)
SWEET16 has one accumulator and 15 other registers, a wealth closer to 68000.
Next is the link to accumulator-based architecture which goes to PDP-8, specifically the section Legacy_of_accumulator-based_architectures which no longer exists. Is there any reason why this has to be split up?
Also it seems a bit lacking that the multiply-and-accumulate is not mentioned.
All in all an article in need of an overhaul. --22:47, 22 February 2009 (UTC) Amended --21:30, 23 February 2009 (UTC)
Hopefully such an overhaul will also disambiguate further, since the term "accumulator" in programming applies to a variable in which values are accumulated... 63.249.90.205 (talk) 00:55, 25 June 2010 (UTC)
External links modified
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What is "early"
#Accumulator machines says Almost all early computers were accumulator machines with only the high-performance "supercomputers" having multiple registers.
However, the IBM 7070[1] had three accumulators, the UNIVAC 1107[2] had 16, the DEC PDP-6[3] had 16 and, of course, the IBM System/360 had 16 general registers. The 1107, PDP-6, S/360 and their successors were popular in the 1960s and 1970s, and that era was dominated by machines with multiple accumulators. So where is the cutoff for "early"? --Shmuel (Seymour J.) Metz Username:Chatul (talk) 22:54, 25 July 2021 (UTC)
References
- ^ Reference Manual IBM 7070 Data Processing System (PDF) (Second ed.). IBM. January 1960. A22-7003-01.
- ^ Technical Bulletin Bulletin UNIVAC 1107 Central Computer (PDF). Remington Rand Univac division of Sperry Rand. November 1961. UT-2463.
- ^ Programmed Data Processor-6 Handbook (PDF). DEC. August 1964. F65.