Post Reply 
Minimal Key Calculator
03-13-2015, 08:51 AM
Post: #4
RE: Minimal Key Calculator
(03-13-2015 08:17 AM)Gerald H Wrote:  What could be the least number of keys needed to reproduce all the functions of, say, the HP 35S keyboard?

The ENTER key.

If you press ENTER repeatedly with special timing gaps you can enter 2^6 different codes with a maximum of 4 key presses each. This is more than sufficient for the HP35S 43 keys. The first ENTER is the start bit followed by 6 bits key code. With 2 baud, that is a maximum one keystroke per second, you can enter 100 program steps in approximately 400 seconds.

Even less keys needed by speech entry. Smile

Bernhard

That's one small step for a man - one giant leap for mankind.
Find all posts by this user
Quote this message in a reply
Post Reply 


Messages In This Thread
Minimal Key Calculator - Gerald H - 03-13-2015, 08:17 AM
RE: Minimal Key Calculator - rprosperi - 03-13-2015, 09:14 PM
RE: Minimal Key Calculator - rprosperi - 03-14-2015, 03:03 AM
RE: Minimal Key Calculator - Paul Dale - 03-13-2015, 08:51 AM
RE: Minimal Key Calculator - Gerald H - 03-13-2015, 09:50 AM
RE: Minimal Key Calculator - PANAMATIK - 03-13-2015 08:51 AM
RE: Minimal Key Calculator - BartDB - 03-13-2015, 10:20 AM
RE: Minimal Key Calculator - Paul Dale - 03-13-2015, 11:14 AM
RE: Minimal Key Calculator - PANAMATIK - 03-13-2015, 11:26 AM
RE: Minimal Key Calculator - Gerald H - 03-13-2015, 11:57 AM
RE: Minimal Key Calculator - Gerald H - 03-13-2015, 12:07 PM
RE: Minimal Key Calculator - Gerald H - 03-13-2015, 12:13 PM
RE: Minimal Key Calculator - Thomas Radtke - 03-13-2015, 05:59 PM
RE: Minimal Key Calculator - Gerald H - 03-13-2015, 06:17 PM
RE: Minimal Key Calculator - BruceH - 03-13-2015, 10:25 PM
RE: Minimal Key Calculator - TASP - 03-13-2015, 10:09 PM
RE: Minimal Key Calculator - Garth Wilson - 03-13-2015, 10:58 PM



User(s) browsing this thread: 1 Guest(s)