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The 71B card reader doesn't have a ROM. It doesn't have a version. The "A" at the end of "82400A" is part of the model number, not a version per se.
For example, the 41C card reader was always model 82104A, even though there were versions 1D, 1E, 1F, and 1G of its ROM.
When a product with a model number ending in A was replaced by a model number ending in B, generally that signified more significant changes to the product than just a ROM code change. For example, the 82240A/B printers and the 9114A/B disk drives had significant physical differences.
Edited: 2 Oct 2011, 12:48 a.m.