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Keyboard and mouse do not work on startup

Boots with system floppy but Keyboard and mouse not responsive. I do get an icon near the bottom of the screen that looks like ADB with an “X” by it. Thoughts?

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What System floppy are you using? It might be too new or not addressing the ROM properly.

Also you could have a dirty ADB port. Knowing how old it is it could have some corrosion on the female or male side of the keyboard that is not letting it connect. Try the keyboard another mac if you have one that old and rule out the variables.

From wiki.

[Although it uses 32-bit instructions, the SE/30 ROM, like the IIx ROM, includes some code using 24-bit addressing, rendering the ROM "32-bit dirty". This limited the actual amount of RAM that can be accessed to 8 MB under System 6.0.8.[1] A system extension called MODE32 enables access to installed extra memory under System 6.0.8. Under System 7.0 up to System 7.5.5 the SE/30 can use up to 128 MB of RAM. Alternatively, replacing the ROM SIMM with one from a Mac IIsi or Mac IIfx makes the SE/30 "32-bit clean" and thereby enables use of up to 128 MB RAM and System 7.5 through OS 8.1.

A standard SE/30 can run up to System 7.5.5,[4] since Mac OS 7.6 requires a 32-bit clean ROM.[5]

Additionally, the SE/30 can run A/UX, Apple's older version of a Unix that was able to run Macintosh programs.[6]

Though there was no official upgrade path for the SE/30, several third-party processor upgrades were available. A 68040 upgrade made it possible to run Mac OS 8.1, which extended the SE/30's productive life for many more years. The Micron Technology Xceed Gray-Scale 30 video card fit into the SE/30's PDS slot, enabling in to display greyscale video on its internal display, the only non-color compact Mac able to do so.]

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It is System 6.0.8 and all I have left is an old System boot floppy. No diagnostic tools.

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It is an ADB and means it is not seeing your keyboard or mouse. You may have to buy/borrow a known working set.

https://www.amazon.com/NEW-Keyboard-Trac...

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I'm going to try and blow some compressed air in the ports. The last time I remember it working was around 1994. I put it in the master closet for the remaining time. I have my kids poems and art on it so I want to get it working since they are adults now and would find it fun to look back. Thanks.

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Does this one has an internal SCSI drive or are your memories on floppies?

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Was your logic board recapped properly? If not, then do that first, and also clean the PCB very throughly before you solder the new capacitors. They used a type of capacitors on these machines that are prone to leaking and shorting out the logic board after 15-25 years or so.

Otherwise, it is also very likely a logic board problem, more exactly it could be a Bourns filter problem. So that needs to be replaced.

As the Larry Pina in the book The Dead Mac Scrolls says:

Symptoms: On startup, the desktop appears, but neither thekeyboard nor the mouse work.

Typical history: The problem occurred when you connected ordisconnected an ADB device while the computer was on.

Probable diagnosis: The problem is on the Mac SE logic board.

Solution: Check/replace the shorted fiIter (Apple part 155-0007-E) at board location A 11

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