Re: I found it! A very sorry looking MK14.
I've never seen that before - I presume it was in National Semiconductor documentation ?
And that it was all for their manufacturing tests, so you wouldn't really be able to do it yourself - Although it might be nice to be able to read these extra test fuses / even program some that weren't blown, to see how good an IC was before programming the data area.
I suppose they had a special test mode that they don't tell you how they entered, in order to do this.
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