Re: [NTLK] Source for DIL switches

From: Sushi (Sushi_at_ragingbull.com)
Date: Sun Jul 28 2002 - 09:17:03 EDT


Hey Marco, are you posting under Robert Locatelli?

Received two messages where header was from Robert.

Sushi

>Date: 7/28/02 9:54 PM
>Received: 7/28/02 10:07 PM
>From: Robert Locatelli, sickofthecrap_at_mac.com
>Reply-To: Newton Talk List, newtontalk_at_newtontalk.net
>To: NTLK, newtontalk_at_newtontalk.net
>
>Am 28.7.2002 14:12 Uhr schrieb "Bernie A. Goltermann" unter
><bagoltermann_at_ksaits.com>:
>> I thought of that as well but it's more
>> elegant to have a 3 pole switch.
>Of course, Bernie, you're right. We need a changeover in case of direct
>switching. However, there will be an uncertainty during the switching that
>none of the switches is closed and the MP crashes just then. I think someone
>reported that his solution with a changeover switch failed sometimes.
>
>In earlier uP-times (Z80 and the like) we had to worry about any single
>cycle because it was needed to refresh the DRAM. Therefore we built a small
>D-flip-flop circuit and could switch w/o any risk. Space would be enough in
>the MP2100...
>
>--
>With best Regards / Viele Gruesse!
>
>Marco Mailand

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