Hi JP > I had Floppy problems, and have found 3 800k floppy drives from older Macs > to use. I have cut the pins on the drives as per the original 800k. If you use a 800k Floppy, which you modified to use in your Lisa, you of course noticed, that it works and it will be only a 400k after that modification - but it works very slow ! This is because your I/O Controller wasn't programmed for those floppies. It's routines are written down in the ROM on the I/O Board located at A2, top left on the board. You should find an EPROM there with a label like: 341-0281 or 341-0290 or sth. like that. These are not extremeley different versions of the same routines in that ROM. But they all can support only 400k floppy-drives !!!
A few weeks ago, I wrote this modification of a newer floppy - by cutting off some of the pins - to replace a lost one or totally defect one in a Lisa. But this is only for testing ! ;-) REALLY To get your so modified floppy-drive now perfect working, you will have to tell your controller, how-to-do-now. You can do that with hours of soldering and hardware-programming, and you need "higher knowledge" about the pipes for data and control commands comming from the drive and communicatin with the IO-Board. I would not recommand this if you aren't an electronic-engineer and familiar with that :-) else: The second way is to replace the socket EPROM on the I/O Board to an EPROM which supports 800 k Drives. It's an 341-8003. Then your modified new floppy-drive works perfect. There are then a few more known different problems, after you change the ROM. Your Lisa can have difficulties with reading 400 k floppies, perhaps. Depends on the boot-ROM-Version... and conflicts with the -8003 > Now my problem is every time I try to boot from a floppy, I get a 10726 > error. (10726 Profile error, problem with boot tracks). Yes, of course. Your floppy-drive works to slow. The routine waits for some seconds and then the Error-Routine comes up with the message 10726. This is not the correct one, cause the programmer could not know, that this kind of drive is set to work in a Lisa at this time. Usually hard-disks show that delay and so that message could appear. A second Error, concerning this message, could be: Your Floppy is corrupted, or your floppy-drive doesn't work properly. Check this first with a second Lisa (if available), it will be less work. > > I am using a Quadra 700 running 7.5.5 to write the disks. The Quadra's > floppy drive writes 400k floppies just fine and can be read by my Mac 512k. Oops ! Only if you have a Mac 512k with an 400k-drive and there it will work perfect, then everything is ok with the disks. I recommend to use a Mac128k, 512k or Plus to write the disks. If you use a Quadra, there are known problems, due to it's built-in 1,44 MB Super-drive. Try to write the disks with your 512k, and everything should be ok. greetings: TOM from Bavaria, the country of the alps...the original octoberfest -- LisaList is sponsored by <http://lowendmac.com/> and... Shop buy.com and save. <http://lowendmac.com/ad/buy.com.html> Support Low End Mac <http://lowendmac.com/lists/support.html> LisaList info: <http://lowendmac.com/lists/lisa.html> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/lisalist%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
