[Simh] A possible Interdata roadmap.

[Davis Johnson]

Larry Stewart wrote:

> ...
> By 1976 we had a couple of 7/32's complete with microcode bugs. You 
> could get the
> microcode into an infinite loop, and thanks to power-save and core 
> memory, you couldn't
> get out again, except by unplugging the core module with the machine 
> running.  This
> gave a good chance of blowing up the memory card...

I think the official solution was to reorder the memory cards. It had 
somthing to do with getting a fault while fetching a fault handler PSW 
because the fault hanler PSW in low memory was bad. Reordering the 
memory cards changed the contents of low memory. Was a pain because it 
involved wire wraps.