Sinclair ZX80 General Maintenance: Revision history

22 September 2026

• curprev 17:5417:54, 22 September 2026 Josh talk contribs 11,187 bytes +51 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 undo
• curprev 17:3217:32, 22 September 2026 Josh talk contribs 11,136 bytes +6,871 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 undo

21 September 2026

• curprev 21:5321:53, 21 September 2026 Josh talk contribs 4,265 bytes +20 Verification drive: flag unverified component data pending check against a primary source undo

12 May 2025

• curprev 10:2710:27, 12 May 2025 Josh talk contribs 4,245 bytes −39 No edit summary undo Tag: Visual edit

2 May 2025

• curprev 15:5115:51, 2 May 2025 Josh talk contribs 4,284 bytes −11 No edit summary undo Tag: Visual edit: Switched
• curprev 15:5015:50, 2 May 2025 Josh talk contribs 4,295 bytes −194 →🛠️ Sinclair ZX80 General Maintenance undo
• curprev 15:4915:49, 2 May 2025 Josh talk contribs 4,489 bytes +1,465 Automated update by bot undo
• curprev 15:4115:41, 2 May 2025 Josh talk contribs 3,024 bytes −264 No edit summary undo
• curprev 15:4015:40, 2 May 2025 Josh talk contribs 3,288 bytes −770 Automated update by bot undo
• curprev 15:3615:36, 2 May 2025 Josh talk contribs 4,058 bytes +2,264 Automated update by bot undo
• curprev 15:3015:30, 2 May 2025 Josh talk contribs 1,794 bytes −3,015 Automated update by bot undo
• curprev 15:2615:26, 2 May 2025 Josh talk contribs 4,809 bytes −1,040 Automated update by bot undo
• curprev 15:1315:13, 2 May 2025 Josh talk contribs 5,849 bytes +1,403 Automated update by bot undo
• curprev 15:1115:11, 2 May 2025 Josh talk contribs 4,446 bytes +1,408 Automated update by bot undo
• curprev 15:0715:07, 2 May 2025 Josh talk contribs 3,038 bytes −947 Automated update by bot undo
• curprev 15:0115:01, 2 May 2025 Josh talk contribs 3,985 bytes −1,266 Automated update by bot undo
• curprev 14:5014:50, 2 May 2025 Josh talk contribs 5,251 bytes +5,251 Automated update by bot