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Show new changes starting from 23:15, 27 September 2026
 
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27 September 2026

     10:43  IBM 5120 Troubleshooting Guide diffhist −593 Josh talk contribs (Structural and content repair: remove emoji from section headings; merge the duplicated References section (the trailing bare bullet list is now named inline refs); de-duplicate the tripled/quadrupled ref definitions that produced visible cite errors; rewrite the bolted-on power-supply and CMOS blocks so they describe this machine (the Dallas DS1287/DS12887 claim and, where applicable, the PC/XT minimum-load sentence did not apply here))

25 September 2026

     00:22  IBM PC Series 300 diffhist +238 Josh talk contribs (P4 verification: link the 6826/8317/8318/8319 hardware maintenance manual hosted here, previously unlinked from any article)
      00:20  IBM PC AT (5170) 2 changes history +119 [Josh (2×)]
     
00:20 (cur | prev) −100 Josh talk contribs (P4 verification: merge the duplicated manual links into one documentation line)
     
00:19 (cur | prev) +219 Josh talk contribs (P4 verification: link the IBM manuals hosted on this wiki that document this machine (they were unlinked from every article))
     00:20  IBM PS/2 Model 60 2 changes history +88 [Josh (2×)]
     
00:20 (cur | prev) −95 Josh talk contribs (P4 verification: remove the now-duplicated manual link bullet (superseded by the fuller documentation line))
     
00:19 (cur | prev) +183 Josh talk contribs (P4 verification: link the IBM manuals hosted on this wiki that document this machine (they were unlinked from every article))
     00:20  IBM PS/2 Model 50 2 changes history +101 [Josh (2×)]
     
00:20 (cur | prev) −157 Josh talk contribs (P4 verification: remove the now-duplicated manual link bullet (superseded by the fuller documentation line))
     
00:19 (cur | prev) +258 Josh talk contribs (P4 verification: link the IBM manuals hosted on this wiki that document this machine (they were unlinked from every article))
     00:20  IBM PS/2 Model 30 2 changes history +156 [Josh (2×)]
     
00:20 (cur | prev) −99 Josh talk contribs (P4 verification: remove the now-duplicated manual link bullet (superseded by the fuller documentation line))
     
00:19 (cur | prev) +255 Josh talk contribs (P4 verification: link the IBM manuals hosted on this wiki that document this machine (they were unlinked from every article))
     00:20  IBM PS/2 Model 25 2 changes history +88 [Josh (2×)]
     
00:20 (cur | prev) −96 Josh talk contribs (P4 verification: remove the now-duplicated manual link bullet (superseded by the fuller documentation line))
     
00:19 (cur | prev) +184 Josh talk contribs (P4 verification: link the IBM manuals hosted on this wiki that document this machine (they were unlinked from every article))
     00:20  IBM PCjr 2 changes history +46 [Josh (2×)]
     
00:20 (cur | prev) −76 Josh talk contribs (P4 verification: remove the now-duplicated manual link bullet (superseded by the fuller documentation line))
     
00:19 (cur | prev) +122 Josh talk contribs (P4 verification: link the IBM manuals hosted on this wiki that document this machine (they were unlinked from every article))
     00:20  IBM PC (5150) 2 changes history +219 [Josh (2×)]
     
00:20 (cur | prev) −79 Josh talk contribs (P4 verification: remove the now-duplicated manual link bullet (superseded by the fuller documentation line))
     
00:19 (cur | prev) +298 Josh talk contribs (P4 verification: link the IBM manuals hosted on this wiki that document this machine (they were unlinked from every article))
     00:19  IBM PS/2 Model 80 diffhist +260 Josh talk contribs (P4 verification: link the IBM manuals hosted on this wiki that document this machine (they were unlinked from every article))
     00:19  IBM PS/2 Model 70 diffhist +217 Josh talk contribs (P4 verification: link the IBM manuals hosted on this wiki that document this machine (they were unlinked from every article))
     00:19  IBM PC XT (5160) diffhist +265 Josh talk contribs (P4 verification: link the IBM manuals hosted on this wiki that document this machine (they were unlinked from every article))

24 September 2026

      22:21  IBM PC Series 300 2 changes history +534 [Josh (2×)]
     
22:21 (cur | prev) −20 Josh talk contribs (De-link red links to pages that do not exist)
     
22:20 (cur | prev) +554 Josh talk contribs (Fix refs so they render: every bare-URL citation converted to a named, labelled reference and deduplicated, and a References list added)
     22:21  IBM PS/ValuePoint 2 changes history +409 [Josh (2×)]
     
22:21 (cur | prev) −34 Josh talk contribs (De-link red links to pages that do not exist)
     
22:20 (cur | prev) +443 Josh talk contribs (Fix refs so they render: every bare-URL citation converted to a named, labelled reference and deduplicated, and a References list added)
     22:21  IBM IntelliStation 2 changes history +2,246 [Josh (2×)]
     
22:21 (cur | prev) −8 Josh talk contribs (De-link red links to pages that do not exist)
     
22:20 (cur | prev) +2,254 Josh talk contribs (Fix refs so they render: every bare-URL citation converted to a named, labelled reference and deduplicated, and a References list added)
     22:21  IBM RS/6000 2 changes history +1,928 [Josh (2×)]
     
22:21 (cur | prev) −63 Josh talk contribs (De-link red links to pages that do not exist)
     
22:20 (cur | prev) +1,991 Josh talk contribs (Fix refs so they render: every bare-URL citation converted to a named, labelled reference and deduplicated, and a References list added)
     22:15  IBM System/23 Datamaster diffhist +4,891 Josh talk contribs (Fix refs so they render; IBMs own SY34-0171-0 now hosted: the power supply is FERRORESONANT with resonant capacitor C6 and an 800 Vac internal hazard, not linear; add IBMs rail tolerances, ripple limits and per-rail fuses; correct the diskette capacities (0.25 MB and 1 MB per drive, not 1.1/2.2) and the 5246 (up to 2 MB, not 4.4); add IBMs full 110-144 model table; the CRT is 305 mm (12 in))
     22:08  IBM PC XT/370 diffhist +3,544 Josh talk contribs (Fix refs so they render; IBM fits TWO cards not three - PC/370-P in slot 4 and PC/370-M in slot 3, with PC/3277-EM only on older machines and the 3278/79 or Remote Display Terminal adapter as alternatives; add IBMs model numbers (5160 Models 568/588/589), the 10 MB vs 20 MB fixed-disk configurations and IBMs unit specifications; host link is coax not twinax)
     22:03  IBM 3270 PC/GX diffhist +5,635 Josh talk contribs (Fix refs so they render; the 5379 is powered FROM the 5378, not from its own socket; remove the phantom 75-pin cable (62-way bus extender to the system unit, 2 m cables to the display); add IBMs own 5378 internals (Motorola 68000, 128 KB shared memory, +5/-5/+12/-12 V supply, eight logic cards incl up to three bit-plane cards) and the full 5379 specification; Model 016 is 576 KB on a /GX)
     22:03  IBM 3270 PC/G diffhist +5,930 Josh talk contribs (Fix refs so they render; the 5278 has NO mains lead - IBM states it is powered from the 5279; remove the phantom 75-pin connector (cables are 1 m and 680 mm; the /GX link is a 62-way bus extender); Model 016 is 640 KB on a /G not 576 KB (that is the /GX figure); the /G has no APA or PSS card; the 5277 mouse is an option not standard; add IBMs full 5278 and 5279 specifications)
     22:03  IBM 3270 PC diffhist +6,487 Josh talk contribs (Fix refs so they render; replace the invented model table with IBMs own (only Models 070/071 have the 20 MB disk; XMA is 1 MB not 2 MB; Models 024/026 use a Plasma Keyboard Adapter); the host link is COAX not twinax and is point-to-point with no terminator - IBMs test is <1 ohm at the connector; add the 3270 unique error-code to FRU table and the documented false 2801 and false 8505; state IBMs own note that all base system parts are 5160 XT parts)
     21:53  IBM PALM processor diffhist +16,854 Josh talk contribs (Fix refs so they render; record IBMs own 1977 description (two-chip 8-bit processor, 49 microinstructions - the 49 count is confirmed exactly by Appendix C); correct the cycle-timing section (E phase is 1-5 E cycles, not 1-3; 530 ns is not a machine cycle); split the 5100 and 5110 I/O device-address tables - nine 5100 addresses are unassigned and the 5110 has no address 2 or F; correct the interrupt-level device assignments; quote IBMs own definition of the jump microinstructions and the hard...)
      21:47  IBM 5110 2 changes history +4,971 [Josh (2×)]
     
21:47 (cur | prev) +51 Josh talk contribs (De-link four red links (bitsavers.org, IBM 1130, IBM 5114 Diskette Unit, IBM Datamaster) to existing pages or plain text)
     
21:47 (cur | prev) +4,920 Josh talk contribs (Fix refs so they render; PSU is a transistor switching regulator (five rails incl +8.5 V), not linear; processor is slot J2 not G2; IEEE bus verified from IBM logic sheet 445 (24-pin Y3, card K2); EBCDIC claim removed - the word appears nowhere in the 5110 MIM; add bring-up diagnostic card mapping)
     21:47  IBM 5100 2 changes history +6,662 [Josh (2×)]
     
21:47 (cur | prev) −8 Josh talk contribs (De-link four red links (bitsavers.org, IBM 1130, IBM 5114 Diskette Unit, IBM Datamaster) to existing pages or plain text)
     
21:47 (cur | prev) +6,670 Josh talk contribs (Fix refs so they render; correct dimensions (445x610x203 mm, IBM's figures - width and depth were transposed) and weight (50 lb/24 kg) to MIM Appendix B; PSU is a transistor switching regulator with five rails incl +8.5 V, not a linear supply with series-pass regulators; state that IBM never uses the name PALM; cite IBM's own 1977 design paper, newly hosted)
N    21:31  Template talk:Navbox-IBMComputers diffhist +984 Josh talk contribs (Explain the navbox-unwritten convention and how to restore an entry when its page is written)
     21:30  Template:Navbox-IBMComputers diffhist +11,900 Josh talk contribs (Render entries with no page as plain text rather than red links (350 greyed, 0 restored) - every page transcluding this navbox inherited its red links)

23 September 2026

     05:05  Template:Infobox computer diffhist +1,001 Josh talk contribs (Add the parameters pages were already passing but the template silently discarded - interface (37 pages), compatible (37), released (15), power (12), connectivity (10), graphics (9), input, rom, expansion, fpu, media, ports - plus alias handling and a parameter list, so that content reaches readers and refs defined in those fields stop vanishing)
      03:40  IBM 5120 Maintenance Guide 2 changes history +5,154 [Josh (2×)]
     
03:40 (cur | prev) +228 Josh talk contribs (Add machine photograph)
     
03:26 (cur | prev) +4,926 Josh talk contribs (Rebuilt against IBM's MIM SY34-0192-0 and Logic Manual SY34-0193-0 (both hosted here). Removes the false 'linear supply with series-pass regulators' and the invented rail table (including a '+24 V typical +/-5%' line and a '12-15 kV anode' figure): the 5120 has a transistor switching regulator board A2 plus a ferroresonant board A1 for the diskettes. Adds IBM's five rails and loaded/unloaded tolerances, the E1-E14 terminal map, the F2/F3/F4 fuse split that localises a fault to one supply, CB1...)
     03:39  IBM PC AT (5170) diffhist +5,808 Josh talk contribs (Rebuilt against IBM's AT Technical Reference and the Personal Computer Family Service Information Manual (both hosted here) plus minuszerodegrees. Corrections: weight is 19.05 kg (42 lb) in IBM's service manual and 20.0 kg (44 lb) in the Technical Reference - both quoted - not '~43 lb (19.5 kg)'; height is 162 mm (IBM prints 6.8 in), not 6.4 in; the eight I/O slots are SIX 16-bit and TWO 8-bit, not eight 16-bit; the 16450 UART belongs to the separate Serial/Parallel Adapter, not the system bo...)
     03:37  IBM PC (5150) diffhist +10,287 Josh talk contribs (Rebuilt against IBM's 5150 Technical Reference (hosted here) and minuszerodegrees. The big correction: there was never a 130 W 'Type 2' power supply for the 5150 - the supply is ~63 W throughout, IBM put the 130 W unit in the XT for exactly this reason, and IBM's own hard-disk answer for the 5150 was the 5161 Expansion Unit. Also: three released BIOS revisions plus an 08/16/82 that may never have shipped (not 'four documented'); the 10/27/82 BIOS requires all four RAM banks populated; five RO...)
     03:35  IBM PS/2 Model 60 diffhist +4,307 Josh talk contribs (Rebuilt against IBM's Model 60 Technical Reference (hosted here), announcement letter 187-050 and the ardent-tool planar map. Corrections: weight is 20 kg (44 lb) per IBM, not 21.3 kg/47 lb; all EIGHT channel connectors are 16-bit - the '1 x 8-bit + 7 x 16-bit' split does not exist; the RTC is a Motorola MC146818A at ZM6 with a separate 6 V lithium battery (72X8498) in the battery/speaker assembly, not a Dallas module and not an external 4xAA pack; there is no -5 V rail. Added the full planar...)
     03:34  IBM PS/2 Model 50 diffhist +5,410 Josh talk contribs (Rebuilt against IBM's Model 50 Technical Reference and Hardware Maintenance Reference (both hosted here) plus ardent-tool. Corrections: the RTC is a Motorola MC146818A soldered at ZM47 with a SEPARATE 6 V lithium battery (72X8498) in the battery/speaker assembly (FRU 33F5950), not a Dallas DS1287/DS12887 module; there is NO -5 V rail (IBM lists only +5, +12 and -12); the BIOS is four 27256s at ZM13-ZM16, not two 64 KB devices; the four channel connectors are described as IBM describes them (o...)
     03:33  IBM PS/2 Model 30 diffhist +4,256 Josh talk contribs (Rebuilt against IBM's Model 30 Technical Reference and announcement letters plus the ardent-tool planar maps. Three figures were wrong: the 8086 Model 30 DOES have a real-time clock (NS MM58167AN at U16, IRQ2, with the 3 V lithium cell on the RISER at B1, not on the planar); the fixed-disk interface is a dedicated 44-pin I/O channel with the controller on the drive, not ST-506; and the supplies are 70 W (8086, internal sensing) and 90 W (286, switched) - there is no 80 W unit. Also fixed two...)
     03:31  IBM PS/2 Model 25 diffhist +2,963 Josh talk contribs (Rebuilt against IBM's Model 25 Technical Reference (hosted here) and the ardent-tool planar maps. Colour PSU is 113 W not 115 W (IBM TechRef; the Canadian quick reference rounds it) and the 286/SX are 124.5 W; the fixed disk is a dedicated 44-pin I/O-channel connector with the controller ON THE DRIVE, not an ST-506 controller or an aftermarket ST-506 kit; keyboard and mouse ports ARE interchangeable on the 8086 per IBM, so the '301 error if swapped' claim is removed; corrected the planar chip...)
     03:28  IBM PCjr diffhist +3,465 Josh talk contribs (Rebuilt against IBM's own PCjr Technical Reference (hosted here). Power section was wrong: the external brick is a 17 Vac transformer only - no rectifier, regulator or bulk capacitor - and all rectification, regulation and protection are on the internal Power Board; added IBM's +5/+12/-6 V rails, load currents, tolerances, trip points and the 1.5 A minimum +5 V load needed for -6 V. Video corrected: the subsystem is a 6845 plus IBM's Video Gate Array LSI5220 with a 16-entry palette, and the d...)

22 September 2026

     01:35  IBM 5120 Capacitor Replacement Guide diffhist +2,959 Josh talk contribs (Rebuild from IBM SY34-0192-0 and SY34-0193-0: supply is a TSR switcher plus a ferroresonant diskette supply, not linear; removed all 'representative' PSU, deflection and drive tables; added resonant capacitor C4, board A1/A2 split, fuses F2/F3/F4, CB1, rail tolerances and IBM's 60-second restart rule; removed the unrelated IBM 5150 polarity image; cleared Unverified data)
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