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How does one distinguish between a 13 and 16-sector Disk ][ controller card?

April 26, 2017card controller disk distinguish

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How does one distinguish between a 13 and 16-sector Disk ][ controller card?

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For a while at least, new 16-sector Disk II cards shipped with a little white circular sticker depicting a red Apple with the number “16” in the middle. But the sticker is hardly a reliable test. A better test is to look look at the part numbers of the P5 PROM (the lower left chip on the card) and the P6 PROM (left column, second from the top). 13-sector 16-sector ——— ——— P5 341-0009-xx 341-0027-xx P6 341-0010-xx 341-0028-xx The 16-sector PROMs may also be labelled “P5A” and “P6A”. A program can test the card type by looking at its slot ROM space.