Re: header pin numbering

[Roger Johnstone <rojaws@es.co.nz>]

In <3E5AEAD9.4000807@telus.spamless.net> Wayne Stewart  wrote:
> I?ve seen boards with 40 pin headers like the one on the
> TransWarpGS marked on the board with any of these numbering
> schemes. Any opinions as to which is preferable in this case?
> 
> 
> 20 19 18 17 16 15 14 13 12 11 10  9  8  7  6  5  4  3  2  1
> 
> 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
> 
> 
> 
> 
> 
> 20 19 18 17 16 15 14 13 12 11 10 9  8  7  6  5  4  3  2  1
> 
> 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21
> 
> 
> 
> 
> 
> 39 37 35 33 31 29 27 25 23 21 19 17 15 13 11  9  7  5  3  1
> 
> 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10  8  6  4  2
> 

Is this for the cable which goes from the TransWarpGS to the CPU socket?

The first pin header numbering scheme would give the correct pin numbers 
for the CPU socket plug.

The last one is the standard used by IDC (insulation displacement 
connectors/ribbon cable). Numbering this way means pin 1 connects to 
wire 1, pin 2 to wire 2 etc. but then it won't match
the CPU socket.

-- 
Roger Johnstone, Invercargill, New Zealand

Apple II - FutureCop:LAPD - iMac Game Wizard
http://homepages.ihug.co.nz/~rojaws/
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