Extended Z80 instruction set: Revision history

17 January 2026

• curprev 14:0314:03, 17 January 2026 Johnnyo talk contribs 55,968 bytes −491 →Z80N instructions opcodes: removed "2 x code" marks, fixed value in TEST line

7 October 2025

• curprev 14:3914:39, 7 October 2025 Sol HSA talk contribs 56,459 bytes −64 link fixes
• curprev 12:1812:18, 7 October 2025 Sol HSA talk contribs m 56,523 bytes −4 remove one }}
• curprev 11:5811:58, 7 October 2025 Sol HSA talk contribs 56,527 bytes −1,368 removed margin:auto
• curprev 11:5711:57, 7 October 2025 Sol HSA talk contribs 57,895 bytes +1,011 rebuilt tables

27 January 2025

• curprev 11:4811:48, 27 January 2025 Xalior talk contribs 56,884 bytes +332 →A note on some Z80-N specific observations
• curprev 11:4711:47, 27 January 2025 Xalior talk contribs 56,552 bytes −220 Revert to old language, before trying to add back the useful bits.

25 January 2025

• curprev 17:3117:31, 25 January 2025 Johnnyo talk contribs m 56,772 bytes −7 →A note on some Z80-N specific observations: typo
• curprev 17:3017:30, 25 January 2025 Johnnyo talk contribs 56,779 bytes +374 →Open Issues: => A note on some Z80-N specific observations
• curprev 17:2817:28, 25 January 2025 Johnnyo talk contribs 56,405 bytes −291 →Errata: removed an inconclusive old paragraph
• curprev 13:0313:03, 25 January 2025 Johnnyo talk contribs m 56,696 bytes +4 →Z80N instructions opcodes
• curprev 12:5412:54, 25 January 2025 Johnnyo talk contribs m 56,692 bytes −2 →Z80N instructions opcodes
• curprev 12:4912:49, 25 January 2025 Johnnyo talk contribs m 56,694 bytes +1 →Z80N instructions opcodes: fix the link
• curprev 12:4912:49, 25 January 2025 Johnnyo talk contribs m 56,693 bytes +195 →Z80N instructions opcodes
• curprev 02:3502:35, 25 January 2025 Johnnyo talk contribs 56,498 bytes −8 →Z80N instructions opcodes
• curprev 02:3302:33, 25 January 2025 Johnnyo talk contribs 56,506 bytes +908 →Z80N instructions opcodes: added a description
• curprev 01:4701:47, 25 January 2025 Johnnyo talk contribs 55,598 bytes +377 →Z80N instructions opcodes: format

24 January 2025

• curprev 23:5923:59, 24 January 2025 Johnnyo talk contribs m 55,221 bytes +3 →Z80N instructions opcodes
• curprev 23:5123:51, 24 January 2025 Johnnyo talk contribs m 55,218 bytes 0 →Z80N instructions opcodes: wording
• curprev 23:4923:49, 24 January 2025 Johnnyo talk contribs 55,218 bytes −380 →Z80N instructions opcodes: encoding column
• curprev 23:3723:37, 24 January 2025 Johnnyo talk contribs 55,598 bytes +1 No edit summary
• curprev 23:2523:25, 24 January 2025 Johnnyo talk contribs m 55,597 bytes +99 →Z80N instructions opcodes
• curprev 23:1923:19, 24 January 2025 Johnnyo talk contribs 55,498 bytes −7 →Term references: -> →Notation
• curprev 23:1823:18, 24 January 2025 Johnnyo talk contribs 55,505 bytes −2 →Z80N instructions opcodes
• curprev 23:1723:17, 24 January 2025 Johnnyo talk contribs m 55,507 bytes +91 →Term references
• curprev 22:5622:56, 24 January 2025 Johnnyo talk contribs m 55,416 bytes −53 →Z80N instructions opcodes
• curprev 22:5122:51, 24 January 2025 Johnnyo talk contribs m 55,469 bytes −40 →Z80N instructions opcodes: wording: timing, aliases
• curprev 22:4222:42, 24 January 2025 Johnnyo talk contribs m 55,509 bytes +11 →Z80N instructions opcodes: wording
• curprev 22:4022:40, 24 January 2025 Johnnyo talk contribs m 55,498 bytes +15 →Z80N instructions opcodes: PUSH explanation adj
• curprev 22:3222:32, 24 January 2025 Johnnyo talk contribs m 55,483 bytes +427 →Z80N instructions opcodes: gray the same in 4-letter column
• curprev 22:0822:08, 24 January 2025 Johnnyo talk contribs m 55,056 bytes +398 →Z80N instructions opcodes: formatting first column
• curprev 22:0222:02, 24 January 2025 Johnnyo talk contribs 54,658 bytes −4 →Errata: wording
• curprev 22:0222:02, 24 January 2025 Johnnyo talk contribs 54,662 bytes +3 →Open Issues: wording
• curprev 21:5821:58, 24 January 2025 Johnnyo talk contribs 54,659 bytes +44 →Z80N instructions opcodes: fixing the sorting per opcode
• curprev 21:5521:55, 24 January 2025 Johnnyo talk contribs 54,615 bytes +130 moving open issues and errata to the end of the page and clarifying the expectations
• curprev 16:0516:05, 24 January 2025 Johnnyo talk contribs 54,485 bytes +197 →Z80N instructions opcodes: changing the default order to the encoding
• curprev 16:0016:00, 24 January 2025 Johnnyo talk contribs 54,288 bytes +213 arranging the Open and Errata content where they belong
• curprev 15:4315:43, 24 January 2025 Johnnyo talk contribs 54,075 bytes +134 →Z80N instructions opcodes: usable last column
• curprev 15:3815:38, 24 January 2025 Johnnyo talk contribs m 53,941 bytes +48 wording
• curprev 15:3415:34, 24 January 2025 Johnnyo talk contribs m 53,893 bytes −2 fixing a few letters
• curprev 15:3115:31, 24 January 2025 Johnnyo talk contribs 53,895 bytes 0 this time the fix should work?
• curprev 15:2815:28, 24 January 2025 Johnnyo talk contribs 53,895 bytes +65 an attempt to move the encodings to the start of the page, moved the "TODO - unconfirmed" paragraph out of the "Erratum"

22 January 2025

• curprev 23:1023:10, 22 January 2025 Johnnyo talk contribs m 53,830 bytes −2 remove superfluous [ ] in previous edit
• curprev 22:0622:06, 22 January 2025 Johnnyo talk contribs m 53,832 bytes +143 add the table.specnext.dev reference

25 June 2024

• curprev 13:0113:01, 25 June 2024 Sol HSA talk contribs 53,689 bytes +169 added note about implementing BSRF in C, implicit variable type promotion gotcha

11 January 2022

• curprev 23:3923:39, 11 January 2022 Ped7g talk contribs 53,520 bytes +342 Fixing flag description for INx/INxR/OUTx/OTxR instructions

16 September 2021

• curprev 17:2117:21, 16 September 2021 Ped7g talk contribs 53,178 bytes +347 erratum about ADD HL/DE/BC,A changing the carry flag.

22 August 2021

• curprev 10:1310:13, 22 August 2021 Ped7g talk contribs 52,831 bytes 0 fix P/V description for TEST
• curprev 09:5009:50, 22 August 2021 Ped7g talk contribs 52,831 bytes 0 fix P/V description for AND/OR/XOR

16 July 2021

• curprev 07:3207:32, 16 July 2021 Mmattsteel talk contribs m 52,831 bytes +151 INIR and OTIR: better explained boundary condition check on B.