apple Lisa2. One working!! - one to go?

Tony (and anyone else interested), Here is the symptom on this Lisa 2/10 (or Mac XL as they are also called sometimes). It passes all tests until it gets to the I/O board test. It then fails with an error 57 message (disk controller fault). Reading Lisa 2 documentation suggests this is the Lisa Lite adaptor, but with a Lisa 2/10 there is no such thing. The floppy disk is connected straight to the I/O board. I am not sure if the fault is on the I/O board itself, or somewhere on the Widget hard drive controller? I've found the schematics, but no real "theory of operation" docs for the widget drive itself. The Lisa allows you to click on both the hard drive icon or the floppy drive icon even after the error is posted. Neither work. The hard drive comes up with an error 82 which means "Drive doesn't answer". I can't recall right now what the floppy error is, but it doesn't spin up or eject, even with a DD drive. I suspect the fault is on the I/O board itself as the floppy seems dead even when the hard disk is disconnected. However, I'm not assuming anything. This may be just because the I/O has reported an error, or it's functionality may need the widget drive to be on-line. Some other things... 1. With the widget and floppy drive unplugged, the same error occurs (but this might be because they ARE unplugged). The error also occurs with either one or the other plugged in 2. When I switch on, the widget drive spins up, the drive light flashes and I "think" I can hear the "clack" people write about when the brake is released. It's quite noisy but I believe these drives are. 3. I've cleaned all the card edges. 4. I'm fairly sure I have the right ROMS. The machine reports H/E8. H is correct for the Lisa 2/10. E8 (which refers to the floppy disk routine I think) is not documented anywhere. 88 seems more common. It may be a later revision. 5. The I/O board looks in good external shape with no evidence of corrosion anywhere. 6. I've reseated all socketed ICs I could find, both on the I/O board and the widget drive. I have a scope, logic probe and multimeter. I also have the schematics. I have a website where I can post pictures if needed for diagnostic purposes. I have "some" skills at interpretation but I would still class myself as an "advanced beginner" so any guidence as to where I might start is most welcome. Terry ----- Original Message ----- From: "Tony Duell" <ard at p850ug1.demon.co.uk> To: <cctalk at classiccmp.org> Sent: Thursday, December 09, 2010 9:19 AM Subject: Re: apple Lisa2. One working!! - one to go?