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See also: http://manuals.info.apple.com/Apple_Support_Area/Manuals/powerbooks/0305537APB150TI.PDF (1994) http://manuals.info.apple.com/Apple_Support_Area/Manuals/powerbooks/0307292APB150TI.PDF (1995) If you need a user's guide...

Yes, 8 MB extra would be 12 MB totally, which should be OK. The maximum total is 40 MB. The service manual for the PB 150 contains information about the RAM expansion card and the adapter.

Glad to hear that. Good work! You may need some extra RAM to begin with.

Just guessing here, but could it possibly have been a temporary power problem with the USB floppy drive while writing the disk images to floppies? I assume that you were making sector-copied disks via the Make A Copy button in Disk Copy 4.2. Sometimes, a USB floppy drive may require a powered...

You may also want to have a look at the web page http://www.knubbelmac.de/wie-geht/datenaustausch/datenaustausch-nullmodemkabel.html It has an outdated link to a "Nullmodemkabel" (you could try the Wayback Machine), but for DB-25 on the PC side. If necessary, adapters DB-25 to DB-9 are...

Hello, You will find the supported system versions here: https://support.apple.com/kb/SP145?locale=en_US Please note that the minimum version is 7.1.1 and a PowerBook 150 Enabler. Instead of using a normal set of system floppies, you could begin by creating just one bootable floppy with a...

Generally speaking, (most) modern sites are secure (https), and downloading anything is almost impossible using a Mac OS 9-compatible web browser. Just one example still using http would be the German knubbelmac.de. This should not be a problem if you keep all downloaded files in an encoded...