Re: Topical Tshirt
> I assume they were referring to the capability at the 1971 dateAnd later on many other devices
> where they were used for microcode loading on IBM 370.
such as my high school's RJE terminal.
> Only IBM internally could write them at that time.Oh, right!
Similarly, ZIP, Jaz and other magnetic media
could not be low-level formatted outside of the factory.
Kinda like the way servo tracks can only be written
by precision machines, not the home version.