HR2510 (UC1201) vs HTX-100 (UC1208)

[erik_ark]

Hello all,

I came along this link: HR2510 Odds and Ends
somewhere halfway the page it says this:

you may also know that the firmware in the UC1201 (2510) is the same as the
UC1208 (HTX). one pin (i'll have to look it up) tells the chip which radio
it is in. funny things happen when you change the logic level of that pin!
like the HTX shifts the PLL 2.5 kHz instead of 1.5 kHz (i finally found
someone who will understand this!) and the 2510 displays "u" or "c" in the
band display, the only modes on an HTX, right?

Anyone know what pin number it is they are talking about?