Olivetti M-20 PCOS or other OS

>From: "SP" <spedraja at ono.com> > >Hello. I own one Olivetti M-20 that I'm cleaning and checking. All

>to go well but the diskette with the PCOS system is damaged. Someone

Hi Sergio What type of disk drives does it have? We have the ability to create disk for the 320K drive but haven't had enough experience to do this for the 640K disk. If you have an AT level PC with a 360K drive, you may be able to create the boot disk your self. The PC does need to have a controller that writes FM format. Many of the newer PC didn't support FM since most PC's were only using MFM 360K or newer. The first track on the 340K disk is done in FM ( single density ) while all the rest are done in MFM ( double density ). Most M20's were shipped with memory cards that had 16K DRAMs. The motherboards usually had 128K of 64K chips. With the three memory cards, at 32K each, the normal configuration would be 224K. To run the CPM8000, you'd need to have a minimum of 256K. This would require having a memory card with 64K chips. I've modified my memory cards to use the 64K chips. To bring up CP/M-8000. Still, to make CP/M-8000 disks still requires writing the first track with FM data. PCOS runs fine on the 224K unless you want to run some of the developement tools like PASCAL that requires 384K as a minimum. Their BASIC runs fine in the 224K machines. Look at: ftp://ftp.groessler.org/pub/chris/olivetti_m20/ There you'll find some images for PCOS and tools to create disks. You can try the tool wrm20.com, that I wrote. If the controller you have is compatable with FM, you should be able to create the boot disk. I'm also told that the images are compatable with tools like 22disk but I've not confirmed this. Look at: http://www.cpm.z80.de/binary.html For the CP/M-8000 stuff. Worst case, I can send a floppy to you in the snail-mail. Anyway, let me know what kind of machine you have, like B&W or color, disk drives and RAM? Later Dwight