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24 September 2026
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21:47 | IBM 5120 2 changes history +2,313 [Josh (2×)] | |||
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21:47 (cur | prev) +36 Josh talk contribs (De-link four red links (bitsavers.org, IBM 1130, IBM 5114 Diskette Unit, IBM Datamaster) to existing pages or plain text) | ||||
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21:47 (cur | prev) +2,277 Josh talk contribs (Fix refs so they render; PSU is two boards - TSR board A2 plus a ferroresonant board A1 for the diskettes with fuses F2/F3/F4 - not a beefed-up linear supply; add the 60-second restart rule (not five seconds as on the 5100/5110); remove unsourced Model F keyboard claim) | ||||
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21:47 | IBM 5110 2 changes history +4,971 [Josh (2×)] | |||
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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) | ||||
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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) | ||||
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) | ||||
| N 01:28 | IBM 5120 Maintenance Information Manual diffhist +2,351 Josh talk contribs (Create documentation page for newly hosted IBM field service manual (RTC verification drive)) | ||||
| N 01:28 | IBM 5110 System Logic Manual diffhist +2,305 Josh talk contribs (Create documentation page for newly hosted IBM field service manual (RTC verification drive)) | ||||
| 01:24 | Upload log Josh talk contribs uploaded File:IBM 5120 Computing System Logic Manual SY34-0193-0.pdf (Upload IBM field service documentation from bitsavers for the RTC verification drive) | ||||