Microcode: Revision history

19 March 2025

• curprev 22:1622:16, 19 March 2025 Guy Harris talk contribs 75,067 bytes +3 →The 360: Speak of "internal steps" (control steps or microinstructions) that implement complex operations; speak of "instructions" risks confusing them with machine instructions. undo
• curprev 22:1322:13, 19 March 2025 Guy Harris talk contribs 75,064 bytes +4 →The 360: The alternatives were microcode, with control store, and hardwired logic, with no control store. undo

8 March 2025

• curprev 01:2101:21, 8 March 2025 Planer28 talk contribs m 75,060 bytes 0 No edit summary undo Tag: Visual edit

26 February 2025

• curprev 12:3112:31, 26 February 2025 TheMathCat talk contribs m 75,060 bytes +8 ref corrected undo

15 January 2025

• curprev 05:1005:10, 15 January 2025 Cmm78 talk contribs m 75,052 bytes +7 fixed citation needed tag formatting undo

12 December 2024

• curprev 21:4721:47, 12 December 2024 AnomieBOT talk contribs m 75,045 bytes +19 Dating maintenance tags: {{Cn}} undo
• curprev 19:3919:39, 12 December 2024 174.93.181.184 talk 75,026 bytes +12 →Moving up the line: removed dot before unfinished sentence, added cn for that part, note that the 68000 gates on the 68000 processor doesn't seem a joke, see https://en.wikipedia.org/wiki/Transistor_count#cite_note-29 + Motorola_68000 undo

16 November 2024

• curprev 17:3317:33, 16 November 2024 Guy Harris talk contribs 75,014 bytes −44 →Examples: Wireless network interface controllers *are* network interface controllers; listing both of them is redundant. undo
• curprev 11:4011:40, 16 November 2024 43.249.50.215 talk 75,058 bytes +1 →Examples undo Tags: Mobile edit Mobile web edit
• curprev 11:3911:39, 16 November 2024 43.249.50.215 talk 75,057 bytes +34 →Examples undo Tags: Mobile edit Mobile web edit

24 October 2024

• curprev 23:4823:48, 24 October 2024 Dwo talk contribs 75,023 bytes +4 MOS:SLASH undo Tags: Mobile edit Mobile web edit Advanced mobile edit

26 September 2024

• curprev 20:1320:13, 26 September 2024 Guy Harris talk contribs 75,019 bytes −3 →Microcode: Not all microcode is stored in ROM. undo
• curprev 16:3216:32, 26 September 2024 141.162.101.52 talk 75,022 bytes +3 Clarify that it is hardware that must be redesigned when custom logic needs changes undo
• curprev 16:3016:30, 26 September 2024 141.162.101.52 talk 75,019 bytes +9 Clarify "logic" undo

25 August 2024

• curprev 20:3820:38, 25 August 2024 GreenC bot talk contribs 75,010 bytes +43 Rescued 1 archive link. Wayback Medic 2.5 per WP:URLREQ#www-03.ibm.com undo
• curprev 14:4614:46, 25 August 2024 Guy Harris talk contribs 74,967 bytes +25 →Examples: dab SRAM, remove unnecessary link to a page already linked at the beginning of the sentence, ce, MOS:TENSE. undo
• curprev 14:3914:39, 25 August 2024 23.145.24.135 talk 74,942 bytes +109 →Examples undo Tags: Mobile edit Mobile web edit Disambiguation links added

22 August 2024

• curprev 07:5507:55, 22 August 2024 Guy Harris talk contribs 74,833 bytes +31 →Micro-operations: Give the Nx586, Pentium Pro, and AMD K5 as the earliest examples of "dynamically decode to uops" processors. undo
• curprev 07:4907:49, 22 August 2024 Guy Harris talk contribs 74,802 bytes +43 →Micro-operations: That begins with the P6 (which dates back almost 20 years, so "modern" isn't all that modern). undo
• curprev 07:4507:45, 22 August 2024 Guy Harris talk contribs 74,759 bytes −103 →Examples: The 486, according to https://ieeexplore.ieee.org/document/63682, doesn't execute simple instructions directly in hardware, although those instructions decode to only one microinstruction. undo
• curprev 05:5105:51, 22 August 2024 Guy Harris talk contribs 74,862 bytes +37 Microcode isn't utilized in contemporary desktops and laptops from Apple, as they use Apple-designed ARM processors, not Intel or AMD x86 processors. Add "laptops" while we're at it. Microcode is used only for instructions that can't be purely handled by the decode hardware in P6+ processors, so remove "also". HTTPS One More Place. undo
• curprev 00:3600:36, 22 August 2024 23.145.24.135 talk 74,825 bytes +79 →Examples undo Tags: Mobile edit Mobile web edit

5 August 2024

• curprev 15:4115:41, 5 August 2024 Bagbaebg talk contribs m 74,746 bytes −1 Fixed a typo undo

28 July 2024

• curprev 17:5717:57, 28 July 2024 Paul C. Anagnostopoulos talk contribs m 74,747 bytes −1 Fixed a few typos. undo

28 June 2024

• curprev 12:0012:00, 28 June 2024 Gaweringo talk contribs m 74,748 bytes 0 →The 360: Fixed typo undo Tags: canned edit summary Mobile edit Mobile app edit Android app edit

23 June 2024

• curprev 07:5307:53, 23 June 2024 Citation bot talk contribs 74,748 bytes 0 Altered title. | Use this bot. Report bugs. | Suggested by Jay8g | Category:CS1 errors: invisible characters | #UCB_Category 21/28 undo
• curprev 02:5102:51, 23 June 2024 Jackashiya talk contribs 74,748 bytes +188 citation updates undo Tag: Visual edit

18 June 2024

• curprev 00:5300:53, 18 June 2024 RastaKins talk contribs 74,560 bytes −21 →Examples: Added specific introduction date to MCP-1600. Simplified WD16 link. undo

17 June 2024

• curprev 11:1111:11, 17 June 2024 Wallby talk contribs m 74,581 bytes −4 →Moving up the line: Fixed a typo undo

13 June 2024

• curprev 20:0420:04, 13 June 2024 Pandaninjas3017 talk contribs 74,585 bytes +9 →RISC enters: rewrite sentences for clarity undo

16 May 2024

• curprev 15:0715:07, 16 May 2024 Beland talk contribs m 74,576 bytes 0 mu not micro per MOS:NUM#Specific units and Unicode compatibility characters (via WP:JWB) undo

24 April 2024

• curprev 17:4517:45, 24 April 2024 Guy Harris talk contribs 74,576 bytes +10 →Microcode: The VAX 9000 IBox appears to be hardwired. undo

20 April 2024

• curprev 08:1708:17, 20 April 2024 Orenburg1 talk contribs m 74,566 bytes −1 sp undo

25 February 2024

• curprev 00:1800:18, 25 February 2024 Citation bot talk contribs 74,567 bytes +100 Add: publisher, s2cid, doi, pages, issue, volume. | Use this bot. Report bugs. | Suggested by Abductive | Category:Wikipedia external links cleanup from February 2017 | #UCB_Category 4/42 undo

19 February 2024

• curprev 08:3108:31, 19 February 2024 WikiCleanerBot talk contribs m 74,467 bytes −9 v2.05b - Bot T20 CW#61 - Fix errors for CW project (Reference before punctuation - Title linked in text) undo Tag: WPCleaner

16 February 2024

• curprev 06:5906:59, 16 February 2024 Guy Harris talk contribs 74,476 bytes −5 →{{Anchor|IML}}Writable control store: Move more stuff that doesn't involve user microprogramming up above the paragraph about user-programmable WCS. Just say "Some machines" - some minicomputer models offered user-programmable WCS, but it doesn't appear to be a lot of them. undo
• curprev 06:5506:55, 16 February 2024 Guy Harris talk contribs 74,481 bytes +1 →{{Anchor|IML}}Writable control store: S/370 doesn't offer user microprogramming (maybe IBM let some customers run custom IBM-written microcode or write their own microcode if they paid enough, but I know of no IBM mainframe where they offered it as an option for all users). undo
• curprev 06:3606:36, 16 February 2024 FarmerPotato talk contribs 74,480 bytes +562 No edit summary undo

14 February 2024

• curprev 03:5603:56, 14 February 2024 FarmerPotato talk contribs m 73,918 bytes +1 →Examples undo

21 January 2024

• curprev 18:3918:39, 21 January 2024 Mazewaxie talk contribs m 73,917 bytes +15 WP:GENFIXES undo Tag: AWB

14 December 2023

• curprev 10:3310:33, 14 December 2023 AnomieBOT talk contribs m 73,902 bytes +19 Dating maintenance tags: {{Update}} undo
• curprev 10:1310:13, 14 December 2023 Guy Harris talk contribs 73,883 bytes +227 →Comparison to VLIW and RISC: This needs updating - modern CISC processors don't use microcode for most instructions, and many modern RISC and CISC processors execute *mroe than one* instruction/operation per cycle. undo
• curprev 09:5109:51, 14 December 2023 Guy Harris talk contribs 73,656 bytes −407 →History: Combine "RISC enters" and "Microcode lives on", discarding the paragraph about Intel, whose processors are already discussed in the last paragraph of "RISC enters", which notes that microcode is used in later processors only for more complicated instructions, not for fetching and decoding and not for simple instructions. undo
• curprev 09:4809:48, 14 December 2023 Guy Harris talk contribs 74,063 bytes +3 →RISC enters: It's the complex instructions that use microcode on Pentium Pro. undo
• curprev 09:4609:46, 14 December 2023 Guy Harris talk contribs 74,060 bytes +1,321 →RISC enters: And CISC follows suit, using less microcode and more hardware over time. undo
• curprev 07:1107:11, 14 December 2023 Guy Harris talk contribs 72,739 bytes +83 →Moving up the line: The VAX was a superminicomputer, so note both minicomputers and superminicomputer, and note that most models of the PDP-11 were microcoded as well (and the VAX wasn't a machine, it was an architecture implemented by multiple machines). undo
• curprev 01:3301:33, 14 December 2023 Guy Harris talk contribs 72,656 bytes −98 →Moving up the line: No, the 8086 wasn't binary-compatible with the 8080. I think there were programs to translate 8080 assembler code into 8086 assembler code, but that's not binary compatibility. undo

13 December 2023

• curprev 22:5522:55, 13 December 2023 Guy Harris talk contribs 72,754 bytes −23 →Microcode: "microarchitecture" does not imply microcode; it's just the internal design of the processor, even if the processor's control is all hardwired. undo

25 November 2023

• curprev 22:5122:51, 25 November 2023 Comp.arch talk contribs m 72,777 bytes +2 No edit summary undo Tag: 2017 wikitext editor

21 November 2023

• curprev 07:2007:20, 21 November 2023 Guy Harris talk contribs 72,775 bytes −43 →Microcode lives on: The 8086 was the first x86 processor, so there was nothing to provide backward compatibility *with*. (Its instruction set may have made it easier to translate *assembler* code from earlier processors into x86 assembler code, but x86 processors couldn't *run* 8008/8080/8085 binary code.) undo