24 Feb
2009
24 Feb
'09
3:09 a.m.
On Monday, February 23rd, Charles H Dickman wrote:
> Robert Jarratt wrote:
> The harness in my system does not seem to match any of the
descriptions I
> have seen so far. The wires are not equal in
length, but it is not a
ribbon
> cable with IDC connectors either. The connectors
are black rather
than
> white. The harness wires do not seem discoloured,
but I believe that
this
> particular system may have only had light use in
its day. I have a
picture
> of the harness but I am not sure if the rules of
this list allow
> attachments.
>
The key point of your description is that the wires
are not equal in
length. This COULD be a bad thing.
On the BA23, the backplane and power supply connectors are at
right-angles to each other, so the 5-volt (red) wires are shorter
than the 12-volt (yellow) wires, as well as most of the grounds (black).
The same is true on the BA123.
As you can see in the ASCII art below, the 12v interconnect wires
end up being longer than the 5V wires.
This is normal.
I have a side-by-side photo of the old style cables, as well as the FCO,
however I don't have a convenient place to post it. If anyone wants it
for reference, let me know.
| 1
| 2
| V
|
| G
| n
| d
|
| 5
| V
5 V G n d 1 2 V
_ _ _ _ _ _ _ _ _ _
T