[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[ih] Deep dive into the C/30 microcode

On Thu, Apr 2, 2020 at 11:07 AM Steve Crocker via Internet-history <
internet-history at elists.isoc.org> wrote:

> One of the more droll discrepancies were the implementations of the Set
> Overflow Bit and Reset Overflow Bit instructions.  We found their
> implementations were reversed.  However, when we consulted with BBN, they
> said they had found the error but instead of changing the microcode, they
> changed the output of the assembler.
i.e. they fixed it in software.?