hi jan,
i've made some progress regarding my older powerbooks!
(1) i pulled the IDE hard drive out of my 150 and am waiting to borrow a friend's IDE-to-USB adapter.
(2) i've made several attempts to cure my 170 of its flashing disk icon upon startup:
(a) i found an old mac disk labeled "Norton Utilities Mac v. 3.0 Emergency Disk," and when i startup from that, i first get the happy mac icon, then the "Welcome to Macintosh" screen, but shortly after i get a window with a bomb icon and a single button that has no text on it. when i click the button (which is the only thing i can do, at that point), the emergency disk is ejected and the powerbook restarted. the same thing occurs when i start up with the emergency disk while holding down the shift key (to turn off extensions) or the spacebar.
(b) i've tried booting from various iterations of "Disk Tools" for system 7, as you suggested, using a PC running the commercial application TransMac to generate the actual boot disks. both of the Disk Tools image files from this website (
http://main.system7today.com/articles/tutorials/disktools.html) initially give me the happy mac icon, but soon the disk is ejected and the all-too-familiar disk icon returns. however, instead of a flashing question mark, i now have a flashing X over the disk icon...
(c) i tried every single boot disk i could download from this website (
http://home.earthlink.net/~gamba2/bootdisks.html), but none of them even give me the happy mac icon - the disks are simply ejected.
(d) i even downloaded a Network Access disk image for system 7.5, but this too was simply ejected with no happy mac icon...
so now i'm at a point where i'm wondering:
(1) am i simply using the wrong boot disk?
(2) is TransMac improperly creating boot disks? (i'm thinking no, because i used it to generate two Disk Tools disks that at least gave me the happy mac initially...)
the norton emergency disk gives me hope that this startup issue can be resolved.
sorry for such a long post. i hope you have some ideas for me!