The 3274 also used them. I have a big pile of ex-3274 floppies that I reformatted and used for my CP/M microcomputer, back in the early 80s...
On Thu, Jul 11, 2024 at 11:11 AM Farley, Peter < [email protected]> wrote: > ISTR there were such floppies that loaded CPU microcode, similarly for > DASD and tape controllers I believe. > > You used to have to do “IML” (“Initial Microprogram Load”) of CPU’s and > some peripheral control boxes before you could use them normally, and the > IML source was one of those floppies. Some hardware fixes and upgrades > were just a new floppy and IML. > > Peter > > From: IBM Mainframe Discussion List <[email protected]> On Behalf > Of Radoslaw Skorupka > Sent: Thursday, July 11, 2024 12:00 PM > To: [email protected] > Subject: Mainframe history - 12 inch floppies? > > > I just found information in some book that IBM mainframes used 12 inch > > floppy diskettes. Late 70's. > > > > Anybody heard about such diskettes? > > > > -- > > This message and any attachments are intended only for the use of the > addressee and may contain information that is privileged and confidential. > If the reader of the message is not the intended recipient or an authorized > representative of the intended recipient, you are hereby notified that any > dissemination of this communication is strictly prohibited. If you have > received this communication in error, please notify us immediately by > e-mail and delete the message and any attachments from your system. > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > -- Jay Maynard ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
