
/* decoder */

Switch 8a sw0 ZERO;
Not    8a sw0 not-sw0;
Switch 9a sw1 ZERO;
Not    9a sw1 not-sw1;

And 6c not-sw0 not-sw1 sel0;
And 6c not-sw0 sw1 sel1;
And 6c sw0 not-sw1 sel2;
And 6c sw0 sw1 sel3;

Probe 6d sel0;
Probe 6d sel1;
Probe 6d sel2;
Probe 6d sel3;

Switch 1a dat0 ZERO;
Switch 2a dat1 ZERO;
Switch 3a dat2 ZERO;
Switch 4a dat3 ZERO;

Not 1c.1a sel0 nsel0;
Not 2c.1a sel1 nsel1;
Not 3c.1a sel2 nsel2;
Not 4c.1a sel3 nsel3;

Tri-state-buffer 1c.1b dat0 nsel0 | dat-buf;
Tri-state-buffer 2c.1b dat1 nsel1 | dat-buf;
Tri-state-buffer 3c.1b dat2 nsel2 | dat-buf;
Tri-state-buffer 4c.1b dat3 nsel3 | dat-buf;


Probe 2e dat-buf;
