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2 independent groups of dependent ports for rows vs. columns
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controlled by 2-3 cascaded 595 shift registers
| # | R0 | R1 | R2? |
|---|---|---|---|
| 0 | YA.0 | XA.0 | XEN3 |
| 1 | YA.1 | XA.1 | XEN4 |
| 2 | YA.2 | XA.2 | XEN5 |
| 3 | YB.0 | XB.0 | n.c. |
| 4 | YB.1 | XB.1 | n.c. |
| 5 | YDAT | XDAT | n.c. |
| 6 | YEN1 | XEN1 | n.c. |
| 7 | YEN2 | XEN2 | n.c. |