R-7000 Memory Channel Expansion

The procedure, which involves lifting pin 19 of IC8 from ground and attaching
it instead through a 47K resistor to +5V.
A separate switch (some owners adapt the little-used VSC switch) is connected
between pin 19 and ground again. With the switch shorting pin 19 to ground,
the original 100 memory channels are called up; with the switch open, an
additional 100 memory channels are made available.

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