Hi all, I found a Macintosh SE 20/1 (made in Ireland): 2.5 MB RAM, HD and FD SuperDrive; no manual, no Floppy Disk :(On boot, it appears to boot, but then crashes with the "no coprocessor" error.The two reset buttons on the MainBoard work : https://ancientelectronics.wordpress.com/2020/06/23/macintosh-se-30/se3020/
By the way, what is the second button for?Can I interrupt the boot and create Floppies from Terminal?
I tried to insert a 1.44 FD, formatted by Windows XP with "winimage", but the FD was not ejected.I thoroughly cleaned and oiled the FD SONY unit with the help of a nice tutorial found on YouTube.Now the Floppy Drive is as good as new and the Mac is able to eject the Floppy Disk.I'm not sure if the Floppu Disk created is of the correct format and I only have Windows PC.
My understanding was that one button was for hard-reset and the other was for interrupt. (programming)
The two switches are for use with the "programmer's key" which mounts to the outside of the case. The Reset button performs a hardware reset, rebooting the machine. The Interrupt button sends a NMI (non maskable interrupt) which enters the debugger if one is installed. When no debugger (such as MacsBug or TMON) is installed, NMI brings up the bare bones MicroBug monitor.
The "no coprocessor" / "floating point processor not found" error is simply an indicator of memory corruption. This can happen for all sorts of reasons, including incompatible INITs, disk drivers, or even buggy installers. It doesn't have anything to do with FPUs—the error is reported for all "Line F Unimplemented" traps.
If your FDHD floppy drive is working, you can write a disk image using the 'fdimage' or 'rawrite' tools that is bootable on the SE.
RawWrite for Windows ?
Thanks robespierreI installed rawwritewin-0.7 on XP, formatted a 1.44MB FD, transferred the OS-7.0.1-Disk_Tools.img file to FD and everything works.The Floppy Disk Drive, cleaned and oiled with the help of the tutorial on Youtube, worked perfectly :)Unfortunately, after dozens of FD swaps and ejections, some created with the Mac, the OMRON gear of eject mechanism has lost all its teeth. :(Ordered on EBAY.
OMRON gear.jpg
Yeah, virtually all of those drives have that same problem. The plastic those gears were made out of usually disintegrates as it ages. It's a good thing that replacements are available.
I've had great success with WinImage doing this. I open the disk image in WinImage, and then click the format+write disk button on the toolbar. Works for me every time. :)