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25 September 2026
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08:54 | Recommended Tools 2 changes history +2,697 [Josh (2×)] | |||
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08:54 (cur | prev) +1,439 Josh talk contribs (P4 verification: cite Apple's own equipment lists: the LaserWriter Technical Procedures bench requirements and the light meter specified for the all-in-one video adjustments) | ||||
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07:58 (cur | prev) +1,258 Josh talk contribs (cite Apple TechStep, the Chilton repair guide and the OneScanner volume (P4 orphan fix)) | ||||
| 08:54 | Capacitor Failure Symptoms diffhist +1,692 Josh talk contribs (P4 verification: add worked examples of ESR-rise and RIFA failure from the two hosted Pina books, with the U.S./International designator warning) | ||||
23 September 2026
| 20:13 | Sinclair ZX81 diffhist +2,453 Josh talk contribs (Cite to Sinclair's ZX81 Service and Assembly Manual and circuit diagram SRC 049; ROM is 8 KB (infobox said 4 KB, contradicting the body), CPU clock is 3.25 MHz on every issue, X1 is a 6.5 MHz ceramic filter; remove the unsourced Issue 1/2 errata table, the Kansas City Standard tape claim, the 27 s/KB loading figure, the truncated 40-way pinout table and the wrong ROM keyword map) | ||||
| 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) | ||||
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02:25 | Recommended Tools 2 changes history +7,999 [Josh (2×)] | |||
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02:25 (cur | prev) +183 Josh talk contribs (Add a topical image (page had none)) | ||||
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02:11 (cur | prev) +7,816 Josh talk contribs (Rewrite and verify every named product: corrected Retro Chip Tester (standalone 8Bit-Museum instrument, not a TL866 add-on) with its real capabilities; corrected ESD mat/strap earthing to require a current-limiting resistor per ANSI/ESD S1.1 (a direct bond to mains earth is dangerous); removed insulated gloves as CRT protection in favour of goggles and the correct discharge tooling; replaced the unsourced 20-50 MHz scope rule with edge-speed reasoning; added sourced solder melting points (Kes...) | ||||
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02:15 | Capacitor Failure Symptoms 2 changes history +12,684 [Josh (2×)] | |||
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02:15 (cur | prev) −40 Josh talk contribs (Remove self-referential wording per house rule) | ||||
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02:07 (cur | prev) +12,724 Josh talk contribs (Rewrite with full citations (Nichicon CAT.8101H hosted here, Vishay 40110, KEMET F3011): corrected 60 Hz hum to twice mains frequency, corrected bulging mechanism to Nichicon gas generation, added missing film/X2 suppression section, added tantalum derating 60-50 percent, added Class II ceramic DC-bias behaviour, replaced Japanese-brand rule with no-datasheet-no-purchase, replaced IPA-only cleanup with Nichicon soap-and-water plus never acidic/alkaline, replaced reforming folklore with Nichic...) | ||||
22 September 2026
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17:54 | Sinclair ZX80 Troubleshooting Guide 2 changes history +5,084 [Josh (2×)] | |||
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17:54 (cur | prev) +51 Josh talk contribs (Correct CPU clock attribution: Sinclair's ZX80 circuit diagram labels the CPU clock 3·2 MHz, not 3.25 MHz; both figures now given with the derivation) | ||||
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17:33 (cur | prev) +5,033 Josh talk contribs (Rewrite from Sinclair ZX80 circuit diagram. Removes all ULA content (the ZX80 has no ULA), corrects ROM to IC2/8332, RAM pin numbers to 2114 Vcc 18 / GND 9, removes invented edge-connector pin numbers and the TR1 video transistor. Adds real IC map, checkpoints and refs; fixes red category) | ||||
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17:54 | Sinclair ZX80 General Maintenance 2 changes history +6,922 [Josh (2×)] | |||
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17:54 (cur | prev) +51 Josh talk contribs (Correct CPU clock attribution: Sinclair's ZX80 circuit diagram labels the CPU clock 3·2 MHz, not 3.25 MHz; both figures now given with the derivation) | ||||
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17:32 (cur | prev) +6,871 Josh talk contribs (Rewrite from Sinclair ZX80 circuit diagram. Corrects PSU polarity (centre POSITIVE, 3.5mm jack, not 2.1mm centre-negative), regulator designator (IC22 not IC3), removes the invented capacitor table and board-revision table, removes ULA references (the ZX80 has none). Add refs, clear Unverified data) | ||||
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17:54 | Sinclair ZX80 Capacitor Replacement Guide 2 changes history +4,968 [Josh (2×)] | |||
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17:54 (cur | prev) +43 Josh talk contribs (Correct CPU clock attribution: Sinclair's ZX80 circuit diagram labels the CPU clock 3·2 MHz, not 3.25 MHz; both figures now given with the derivation) | ||||
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17:30 (cur | prev) +4,925 Josh talk contribs (Rewrite from Sinclair ZX80 circuit diagram: every value in the old table was wrong (C1/C2/C4/C5/C6 are 47nF ceramics, not electrolytics; the 22uF reservoir is C8; reset cap is C10 1uF; no C3/C7 exist). Add refs, clear Unverified data) | ||||
| 17:27 | Upload log Josh talk contribs uploaded File:Sinclair ZX80 circuit diagram.png (Sinclair ZX80 circuit diagram (Sinclair Research original)) | ||||
21 September 2026
| 21:53 | Sinclair ZX80 Troubleshooting Guide diffhist +20 Josh talk contribs (Verification drive: flag unverified component data pending check against a primary source) | ||||
| 21:53 | Sinclair ZX80 General Maintenance diffhist +20 Josh talk contribs (Verification drive: flag unverified component data pending check against a primary source) | ||||
| 21:53 | Sinclair ZX80 Capacitor Replacement Guide diffhist +20 Josh talk contribs (Verification drive: flag unverified component data pending check against a primary source) | ||||