Elf99 - rebirth of a classic

From: Ethan Dicks <erd_at_infinet.com>
Date: Tue Nov 10 16:56:49 1998

>
> At 00:46 10/11/98 -0500, Ethan Dicks <erd_at_infinet.com> wrote:
>
> >> > The problem with replicating the SuperElf is the keyboard. I have no
> >> > idea where to get that chip from (74941?), nor an inexpensive source
> >> > for that many pushbuttons (including some latching ones).
>
> As far as the keyboard encoder chip goes, you wouldn't be thinking of the
> 74922 would you? It's a 16 key keyboard encoder chip designed, as I
> remember, to encode a 4 x 4 key matrix...

Yes, it is. After pulling a part number out of my... after misremembering
the number aove, I checked the schematics. It is the 74922.

> Anyway, according to the Australian edition of the Farnell catalogue, both
> these chips are still available...

I was surprised to find the number of articles on the web that advocated the
74922 with a Basic Stamp or PIC. My tentative research turned up a price of
$10 or less in the States.

> ...PCB mount NO push buttons (I think they're called D6 type)

I would need to see a footprint to know if they fit the existing layout.

> Depending on the price, I'd probably be interested in one of these little
> machines too.

I'll put you down, too.

-ethan
Received on Tue Nov 10 1998 - 16:56:49 GMT