Mari van den Broek wrote:
>
> Hello,
>
> >The hole marked with an arrow/triangle on the connector corresponds
> >with:
> >*lead number 1 for *other* applications
> >*lead number 34 for floppydriveconnectors/cables
>
> Why is there a arrow/triangle on these connectors?
to indicate physical pin/lead 1. This can be helpful in case there is no
'notch' in the middle of the connector. (so to prevent misconnecting)
> And why is there allmost
> allways a red-painted wire in these cables?
I don't know if there are any rules established concerning the colour of
the wire(s), but if there is a red coloured one, the best thing to do is
to use it as physical pin/lead 1. (Note the fact that the flatcables
used for the Philips nms8255 also have a red wire, but it is *not*
connected with the 'triangle-lead' at one side)
>
> There are several ways
2 ways
> to put a connector on this cable, but if it is done
> right the red-painted wire is at the arrow/triangle position of the
> connector...
this is correct. This (red-painted) wire is PHYSICAL lead number 1. This
is the case for ALL flatcables (both floppy/non-floppy)
The 'special thing' about floppy-connectors is the fact that the LOGICAL
lead numbers (example: logical lead 28='WriteProtected') are different
from the PHYSICAL lead numbers. Like stated before: PHYSICAL lead 1 (red
wire) corresponds with floppy's LOGICAL lead 34.
>
> >BTW Some years ago I got a kind of thin 'book' from NBNO 'how to build a
> >pc-drive in your MSX'. This description was not correct because of the
> >wrong lead/connector numbering. (funny detail: I got it for free... from
> >Dutchmen ;-) Thanks guys!)
>
> The main idea about this booklet is to explain HOW to connect a PC-drive to
> MSX...
> If you both the lead and the connector number in the "wrong" way, you still
> get a working cable!!
not really true (unless you have the opportunity to plug the
flatcableconnector in a wrong way into your diskdrive and/or motherboard
(if there is no notch))
> So we can discuss a little longer about what is right and what is wrong...
>
Anyway... if you follow the description in your booklet, you won't get a
working drive; The things that are wrong are: (I'm only talking about
the nms8250/55/80 chapter)
-you don't make a distinction between the logical and physical pin
assignments; you write to cut (logical) lead 33 and 34 (which is
correct), but you write also that these leads are the leads that can be
found on the opposite side of the triangle/arrow of a connector (which
is false, here you are referring to physical leads 33 and 34)... etc...
etc...
-the schematic pictures of the cable(s) are not realistic: the connector
marked with 'DRIVE' does not exist (the arrow is on the wrong side)
I hope to have cleared up some things... with a bit of patience it
should be possible to make a flatcable that works from the first time
without the need to remount or replugging connectors till the damn
driveled goes out :-)
Greetz,
Jon
PS. The numbers printed on the motherboard of the nms8255 refer to
logical pin numbers.
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