Re: the order in which some switches are turned on

On Tue, 22 Apr 2008 22:19:01 -0700, laura wrote:

I have an array of N switches . Initially all are OFF.

Somebody turns them ON in some order. It is possible that more
switches are turned ON in the same moment.

I need a device which shows me the order in which the switches were
turned ON. For instance the device should give me: 4,3,1,5,2 (this is
the order in which the switches were turned ON).

The way in which the output is shown in not important. It must be
simple to read (by a human, computer, etc).

It is important that the device is able to handle the turned ON (in
the same moment) of the multiple switches.

I've done this before (n-key rollover), with a 6502. These days I'd have
to program an FPGA with a 6502 core and invest in an EPROM for the s/w.
Or, I could do the whole thing in the FPGA, or even design it in
"discrete" (i.e., chip-level) logic. I categorically refuse to have
anything to do with a PIC, because bank-switching is intrinsically evil.

I'll be happy to design and build the whole circuit for you, and submit
it to your instructor under your name, for one easy payment of only
$10,000.00. :-)

Let me know!
Rich
(If you want to email me, take my yahoo spamdump, richardgrise@xxxxxxxxx,
and elide ard.)

.

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