On Tue, May 24, 2016 at 9:56 AM, Swift Griggs <swiftgri...@gmail.com> wrote:
> On Tue, 24 May 2016, Jon Elson wrote: > > The early PDP-11s had a diode matrix ROM for the boot memory. You could > > change the boot code with a wire cutter and soldering iron. > > Is that similar to "wire wrap" ? I remember my grandmother talking about > having to snip wires connected to diodes. I think this was in the 50's but > it might have been the 60's, too. She mentioned something like that. > > Wirewrap is solderless. https://upload.wikimedia.org/wikipedia/commons/thumb/3/35/Wire_Wrapping.jpg/220px-Wire_Wrapping.jpg Very good for prototyping, automated wirewrapping was for some production. -- Charles