Article View: comp.arch
Article #21399Re: WOM(Write Only Memory): also the SED and the DED
From: Joseph H Allen
Date: Sat, 20 May 1989 04:55
Date: Sat, 20 May 1989 04:55
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2457 bytes
In article <184@berlioz.nsc.com> nelson@berlioz.UUCP (Ted Nelson) writes:
>Or we could use National Semiconductor's new memory product: 1 Megabit
^^^^^^^^^^^^^^^^^^
> Write-Only Memory (WOM). This is extremely inexpensive, has an access
> time of only 10 ns, and will be available in a dual-port version in only
> a few months. If you wish to order any of this great part, pleast
> contact me directly -- it is such a secret project that we haven't let
> Marketing in on it yet.
Speaking of new products, I'd like to introduce my new display devices: the
SED (smoke emiting diode) and DED (dark emiting diode). Actually, normal LEDs
can be resold as SEDs by simply modifying the specs with reguard to power
requirements: instead of 5 volts through a current limiting resistor, use 9
volts (or if you'd like to try to use the diode in the 'EED' range (explosion
emiting diode) use 12 volts) without the limiting resistor. Note that a power
supply capable of 10 amps is preferable.
Unfortunatly, the SED has several marketing problems:
* short lifespan (only one puff of smoke)
* large power requirements
* slow display speed (completely unsuitable for AD boards)
* advanced GaAs process makes competitive pricing difficult
However, a new product has been identified: The DED. Spent SEDs can be reold
as dard emiting diodes. These have the following features:
* extremely long lifespan: no mesearable degradation in performance has
ever been observed.
* low power requirements (only when used in normal operating range: see
below)
* possible use as a new type of voltage regulator: once the voltage goes
above the specified 'breakdown' (typically 150 volts), a large, Zener
diode-like rise in the IV curve is noticed.
* extremely fast switching time: all of its display states are reachable
in zero time (you optical computing people should pay attention to this!)
Technical Details
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!ukma!husc6!m2c!wpi!jhallen From: jhallen@wpi.wpi.edu (Joseph H Allen) Newsgroups: comp.arch Subject: Re: WOM(Write Only Memory): also the SED and the DED Message-ID: <2365@wpi.wpi.edu> Date: 20 May 89 04:55:16 GMT References: <184@berlioz.nsc.com> <1227@motmpl.UUCP> Reply-To: jhallen@wpi.wpi.edu (Joseph H Allen) Distribution: usa Organization: Worcester Polytechnic Institute, Worcester, MA. USA Lines: 37