Self modifying code, lambda calculus - Re: ENIAC programming

Paul Koning paulkoning at
Sat Sep 19 08:03:46 CDT 2015

> On Sep 19, 2015, at 5:25 AM, Rod Smallwood <rodsmallwood52 at> wrote:
> Is an overlay self modifyig code?

Yes (#2 in my list), but a controlled kind so it doesn't suffer from the maintainability issues of explicitly modified instructions.  But it does require I-cache management, if the computer has an I-cache.  Not all that likely; a machine small enough that overlays are valuable isn't all that likely to have an I-cache.


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