PDP-9: Revision history

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curprev 21:4821:48, 16 July 2025 Jnc talk contribs m 6,025 bytes +167 →External links: +PDP-9 Restoration Blog 2024

curprev 20:1420:14, 9 February 2024 Jnc talk contribs 5,858 bytes +195 Re-implementation in FLIP CHIPs
curprev 19:4719:47, 9 February 2024 Jnc talk contribs m 5,663 bytes +274 →External links: +several survivors

curprev 01:2201:22, 7 February 2024 Jnc talk contribs m 5,389 bytes +956 →External links: +RICM restoration blog

curprev 06:1906:19, 12 August 2023 Larsbrinkhoff talk contribs 4,433 bytes +344 A comment about PDP-9 microcode I found online. Given the mix of microcode with random logic, I think "diagonal microprogramming" is an apt description.

curprev 06:2306:23, 25 July 2023 Larsbrinkhoff talk contribs 4,089 bytes +23 The 9/L was slower!

curprev 10:3910:39, 24 July 2023 Jnc talk contribs 4,066 bytes +88 List front panel functions implemented with microcode; Memory Extension was bank switching

curprev 15:2915:29, 23 July 2023 Jnc talk contribs 3,978 bytes +42 Front panel functions used microcode. (Just some, or all?)

curprev 09:4909:49, 17 July 2023 Jnc talk contribs m 3,936 bytes +42 →See also: +PDP-9 control memory

curprev 11:3911:39, 15 July 2023 Larsbrinkhoff talk contribs 3,894 bytes +142 Link to Dartmouth's PDP-9 Mini Time-Sharing System.

curprev 12:3612:36, 11 July 2023 Jnc talk contribs m 3,752 bytes +13 +Nav DEC
curprev 11:3911:39, 11 July 2023 Larsbrinkhoff talk contribs 3,739 bytes +31 18-bit cat.

curprev 12:3012:30, 11 May 2023 Larsbrinkhoff talk contribs 3,708 bytes +97 Hard-won identification of PDP-9 at MIT Cognitive Information Processing Group.

curprev 20:3420:34, 14 March 2022 Jnc talk contribs 3,611 bytes 0 '060' is JMP
curprev 20:3120:31, 14 March 2022 Jnc talk contribs 3,611 bytes +232 more info on inst set

curprev 21:3121:31, 11 February 2022 Jnc talk contribs 3,379 bytes +152 re-implementation of the PDP-7

curprev 00:2400:24, 14 May 2021 Jnc talk contribs 3,227 bytes +61 KE09 installation

curprev 12:1012:10, 5 May 2021 Jnc talk contribs 3,166 bytes +168 microcode details
curprev 10:5910:59, 5 May 2021 Jnc talk contribs 2,998 bytes +281 microcode details
curprev 01:0101:01, 5 May 2021 Jnc talk contribs m 2,717 bytes −1 tense match

curprev 20:5520:55, 4 May 2021 Jnc talk contribs 2,718 bytes +698 more CPU options
curprev 14:0014:00, 4 May 2021 Jnc talk contribs 2,020 bytes +156 →Further Reading: +link

curprev 16:1616:16, 20 October 2018 Jnc talk contribs m 1,864 bytes +5 Proper cat, +links

curprev 19:4819:48, 18 February 2018 Jnc talk contribs m 1,859 bytes −32 fix cats

curprev 01:0801:08, 8 November 2017 Jnc talk contribs 1,891 bytes +5 Fix errs

curprev 02:3602:36, 7 November 2017 Jnc talk contribs 1,886 bytes +1,886 An OK start

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