5 Apr
2011
5 Apr
'11
5:24 a.m.
--- On Tue, 4/5/11, Steven Hirsch <snhirsch at gmail.com> wrote:
Several questions:
- I think my unit is 512k (one Apple-branded memory
board). Will the disks you refer to work on that?
MacWorks should definitely work - but I'm not sure about LisaTest or Lisa Office
System. I know Lisa Office System really wants 1mb. IMHO, LisaTest *should* run on 512,
but I've never tried it.
- Are you implying that the hang might be due to my
not
having the ProFile attached?
It shouldn't hang without a drive attached, it usually asks if you want to test the
Profile, or the internal drive, and lets you skip those tests if you want. That way, you
can just test the memory, etc.
- Is it possible to substitute an 800k drive from a newer
mac? I have several with the same 20-pin connector,
but ISTR a discussion (that I naturally cannot find now)
about electrical incompatibility with the Lisa Lite
interface board.
Yes, you should be able to, if you make a cable that omits pin 20 (motor speed control -
800k drives have internal speed control), and pin 9 (some extra voltage, I think).
Have you tried cleaning the head on the disk drive? Use a cotton swap with isopropyl
alcohol to clean it - I've seen them get pretty gunky. Also, is the little felt
pressure pad at the top present and accounted for? If it's missing, the disk won't
make constant contact with the head and you'll get random read errors. Also, double
check to ensure the rails the head rides on are clean and free of grease or gunk - they
can prevent the head from moving to further tracks.
Also, what are you using to write the disks? You really can't use DiskCopy 6.3 - it
writes disks missing some timing information and they won't work. DiskCopy 4.2,
however, works.
-Ian