Wow. Thanks for the great suggestions.
It's going to take me a while to work through them. My (un-inventoried) vintage Mac parts stash is at another location - and the IIsi PSUs are there too. Know I have more floppy drives. There possibly might even be another logic board to try.
But if there isn't one - for me liquids+electronics is not a familiar mix. Any links to proper board washing and drying? (Seems to be very different methods mentioned online.)
Thinking that the power supply from an ATA/USB drive adapter (same molex) would power the drive in the case, but will wait until the floppy drive is replaced so can run utilities.
As far as external booting, think I still have a SCSI case for an HDD, also dimly recall making a Zip disc with a bootable System 7 on it, so can try that too.
Do these models boot from an external CD? Pretty sure I can find an OS 7.6 CD to put into an Apple CD-300.
Battery is new.
Couldn't try the no-floppy drive suggestion without the PSUs here, but did some ohm-metering (though I can't interpret). Disclaimer: it's a cheap beat up meter with fat probes generally used for battery checks. Done with PSU and drives removed.
HDD Power Pins (believe 1 12V, 2&3 GND, 4 5V)
1-2 or 1-3 brief 0 ohm, then either readings from 0.5 M ohm up to 2 ohm
1-4 1.8 M ohm
2-3 0 ohms (ground ground)
2-4 or 3-4 0.4 K ohm, and slowly rising
Thanks very much for the support.
It's going to take me a while to work through them. My (un-inventoried) vintage Mac parts stash is at another location - and the IIsi PSUs are there too. Know I have more floppy drives. There possibly might even be another logic board to try.
But if there isn't one - for me liquids+electronics is not a familiar mix. Any links to proper board washing and drying? (Seems to be very different methods mentioned online.)
Thinking that the power supply from an ATA/USB drive adapter (same molex) would power the drive in the case, but will wait until the floppy drive is replaced so can run utilities.
As far as external booting, think I still have a SCSI case for an HDD, also dimly recall making a Zip disc with a bootable System 7 on it, so can try that too.
Do these models boot from an external CD? Pretty sure I can find an OS 7.6 CD to put into an Apple CD-300.
Battery is new.
Couldn't try the no-floppy drive suggestion without the PSUs here, but did some ohm-metering (though I can't interpret). Disclaimer: it's a cheap beat up meter with fat probes generally used for battery checks. Done with PSU and drives removed.
HDD Power Pins (believe 1 12V, 2&3 GND, 4 5V)
1-2 or 1-3 brief 0 ohm, then either readings from 0.5 M ohm up to 2 ohm
1-4 1.8 M ohm
2-3 0 ohms (ground ground)
2-4 or 3-4 0.4 K ohm, and slowly rising
Thanks very much for the support.