Dual Sense Amp for 8/I, IC levels, also used for G020
<UL>
<LI><b>G021B</b> needs a drawing.</LI>
<LI><b>G021old</b> is a drawing of DEC's G021 Core Sense Amplifier board,
with the unobtainium MC1540 sense amp chips.</LI>
<LI><b>G021dec</b> is a drawing of DEC's G021 Core Sense Amplifier board,
with the unobtainium MC1540 sense amp chips.</LI>
<LI><b>G021K</b> is a drawing of DEC's G021K Core Sense Amplifier board,
with the layout based on the G021H.</LI>
<LI><b>G021K-E</b> is a drawing of DEC's G021 Core Sense Amplifier board,
with the layout based on the G021E.</LI>
<LI><b>G021Kng</b> is a drawing of DEC's G021 Core Sense Amplifier board,
with the H layout, but without the gold edge connector.</LI>
<LI><b>G021vrs</b> is a drawing of DEC's G021 Core Sense Amplifier board,
with the unobtainium MC1540 sense amp chips.</LI>
<LI><b>sense-amp</b> is an approximation of the function of the MC1540,
using LM148 op-amps.</LI>
<LI><b>G021-1</b> is a 12/04/2004 checkpoint of G021.</LI>
<LI><b>G021</b> is a version of the G021 with the MC1540 replaced with
LM837.</LI>