[GreenKeys] Dovetron coding question

[Christian Gauger-Cosgrove]

Hello,

The first reason is: BCD -- Binary Coded Decimal

That is, one nibble (four bits) is one digit, 0 through 9, the other
is the second digit.

So while 75 is written as 01001011 in "pure" binary. In BCD you have 7
(0111) and 5 (0101).

Why it has 75 written as "11101010" is just completely weird. Since
that means that while it does go MSD to LSD left to right in terms of
the decimal digits, each individual BCD digit is written LSB to MSB.


Or at least that's what I can tell from the information provided.

Cheers,
Christian

On 26 January 2013 12:06, Keith Densmore <ve3gem at gmail.com> wrote:
> Hi All,
> At the risk of showing my  lack of basic knowledge in computer stuff, I have
> run into a question with my Dovetron with speed conversion.
> The speed conversion rate rate  is programmed via a mini 8 dip switch
> package in BCD. The manual says the left four positions (1-4)  are MSD the
> right four LSD. (5-8). The maual also shows the correct number for me to
> have a 50 baud printer to be input is 75
>
> I make that to be 01001011
>
> But elsewhere in the manual it  gives the switch positions for the  number
> 75 as 11101010. This programming is in fact the correct program number.  Why
> is it not the 01001011  ?
>
> What am I missing here?
>
> Thanks,
> Keith ve3ts
>
>
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