Re: 13 sector or 16 sector Disk ][ card?

["Rick Kerman" <rkerman@mail.bright.net>]

Perry Dueck <pdueck@pli.mb.ca> wrote in article
<pdueck-1406970030180001@dial15.pli.mb.ca>...

> Perhaps a bit of a stupid question, but here it goes anyways (for my
> benefit if nothing else):    :)
> 
> How would one distinguish between a Disk ][ card which is capable of 13
> sectors (original...wayyyyy back in the early days of the Apple ][), and
a
> 16 sector Disk ][ interface card?  Are the ROM chips marked with a
special
> number to distinguish between the two different kinds or something?

16 sector cards had rev. A proms, 341-0027-A and 341-0028-A.  In later
years, the "-A" was replaced with "-00" to accomodate a new part numbering
system.  13 sector cards won't have the A revision tacked on the end of
the part number.  An upgrade kit was readily available, and it is unusual
to find cards with the 13 sector proms still installed.