One of the tricks was that exceptions/traps/interrupts were handled in a neat way.
The microcode looked at the first instruction of the handler. If it was an old instruction, a backwards compatible stack frame was created. If it was a new instruction, a new-style stack frame was created.
Data General published a couple of papers about their new 32-bit architecture.
The microcode looked at the first instruction of the handler. If it was an old instruction, a backwards compatible stack frame was created. If it was a new instruction, a new-style stack frame was created.
Data General published a couple of papers about their new 32-bit architecture.