Front panel switches - what did they do?

Brent Hilpert hilpert at
Wed May 25 14:23:28 CDT 2016

On 2016-May-24, at 5:48 PM, Paul Koning wrote:
>> On May 24, 2016, at 8:30 PM, Eric Smith <spacewar at> wrote:
>> On Tue, May 24, 2016 at 3:09 PM, Brent Hilpert <hilpert at> wrote:
>>> Yes, I examined this in some detail last year after mention on the list, and wrote it up:
>> That's a great write-up! Thanks!
> Agreed!
> I'm going to have to study the training manual for the EL-X1 in more detail, because it describes how its ROM core memory works, and it doesn't seem to be an exact match of either of the ones in Brent's document.  Since it goes back to 1958 it seems to be the oldest example, so it's worth digging out the details.

Thanks; if you find out some details or refs about the X1 ROM implementation, let me know, I'll be interested to compare them and should add mention of it on my page at some time as another application of the technology.

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