Diagnostic Serial Console: Revision history

23 September 2026

• curprev 22:3422:34, 23 September 2026 Josh talk contribs 46,799 bytes +1,788 Separate Apple sourced fact from community bench work: cite the hosted Apple TechStep User Guide (whose CPU Tests Vol 1 ROM pack covers Classic/SE/SE-30/II/IIx/IIcx but NOT the Plus) and Adrian Black's Test Manager spreadsheet; mark the SIMM/data-bus and response-code findings as original research; drop the unverified Command-Power entry method; add a References section undo

27 August 2025

• curprev 21:3021:30, 27 August 2025 Josh talk contribs 45,011 bytes +433 →Important Notes undo Tag: Visual edit

25 August 2025

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22 August 2025

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21 August 2025

• curprev 17:1117:11, 21 August 2025 Josh talk contribs 5,432 bytes +182 →RAM Chip Identification (Subcode Explanation) undo Tag: Visual edit
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• curprev 12:2712:27, 21 August 2025 Josh talk contribs 5,071 bytes 0 →Connecting to the Diagnostic Console undo Tags: Mobile edit Mobile web edit
• curprev 11:0711:07, 21 August 2025 Josh talk contribs 5,071 bytes +21 →Connecting to the Diagnostic Console undo Tags: Mobile edit Mobile web edit

3 April 2025

• curprev 09:5009:50, 3 April 2025 Josh talk contribs 5,050 bytes +42 No edit summary undo

12 March 2025

• curprev 17:1517:15, 12 March 2025 Josh talk contribs 5,008 bytes +38 No edit summary undo
• curprev 17:0117:01, 12 March 2025 Josh talk contribs 4,970 bytes +4,970 Created page with "The Macintosh Plus, SE and SE/30 feature a built-in diagnostic console accessible via a serial connection, which can be used for detailed hardware troubleshooting. Originally designed for use with specialized Apple diagnostic tools, this diagnostic mode can also be accessed via a standard serial connection using software such as PuTTY or similar serial terminal programs. Adrian Black's spreadsheet on this topic provides the most useful breakdown of how to use the diagnos..."