The Sequoia AVC Advantage is an old-technology direct-recording electronic voting machine. It doesn’t have a video display; the candidate names are printed on a large sheet of paper, and voters indicate their choices by pressing buttons that are underneath the paper. A “ballot definition” file in an electronic cartridge associates candidate names with the button positions.
Clearly, it had better be the case that the candidate names on the printed paper match the candidate names in the ballot-definition file in the cartridge! Otherwise, voters will press the button for (e.g.,) Cynthia Zirkle, but the computer will record a vote for Vivian Henry,as happened in a recent election in New Jersey.
How do we know that this is what happened? As I reported to the Court in Zirkle v. Henry, the AVC Advantage prints the names of candidates, and how many votes each received, on a Results Report printout on a roll of cash-register tape.
The printout reads, in this case,
I23 Cynthia Zirkle 10 I24 Ernest Zirkle 9 J23 Vivian Henry 34 J24 Mark A. Henry 33
In this election, four candidates are running for two positions in a vote-for-any-two election. Here, J23 indicates that the button at column J, row 23 on the face of the AVC advantage received 34 votes. The problem was that the poster-size printed paper covering the buttons had the name Cynthia Zirkle printed at position J23. Vivian Henry’s name was printed at position I23. That is, there was a mismatch between the printed paper and the electronic ballot-definition file. Similarly, the positions of Ernest Zirkle and Mark Henry were swapped.
Rebecca Mercuri told me that until the mid 1990s, the AVC Advantage firmware did not print the row/column numbers at all, so that mismatches like this were harder to detect.
One might think that all is well–there’s a fail-safe mechanism that can catch mistakes (or deliberate fraud) where the paper doesn’t match the electronic file. But in this election, the fail-safe mechanism did not work well at all.