Re: scsi hard disk for IIe

[GregChi <GregChinospam@snet.invalid>]

On Wed, 26 Feb 2003 09:02:19 +0800, "Allen Bong" <sfbong@tm.net.my>
wrote:

>Hi,
>
>I bought a scsi enclosure (cheap) and mounted my 700MB Quantum drive into
>it.  From the back of the enclosure there is a 5-pin plug with 4 wires on it
>which I can't find a place to plug in on my HD.  It  is for the address
>selection switch connected to a thumbwheel switch with 2 buttons on it.
>
>Anyone know how I am going to connect this cable.  Can I just solder the
>wires to the 6-pin jumper block A0,A1,A2  directly and anyone know which
>wire goes to where?
>
>If my drive is terminated internally.  Do I need to put a terminator on the
>other CN50 socket outsoide the enclosure?
>
>
>Allen
On the Quantum, the grounds for a0,a1,a2 are all tied together
(common). If you use an ohmmeter you will get relatively 0-ohms from
1-set of 3-pins.
On the switch, 1 of the 4 wires is common. the others are 0-1 0-2 0-4
SCSI id's. (test & select  w/ meter)
You MAY solder the connectors..The question is CAN you  :-)
All my Quantums use a VERY small set of a0,a1,a2,etc jumper pins ( I
requested & received some VerySmall jumpers from Quantum tech) & have
internal select of SCSI id's. I have to open the cases to change them
:-(
(best to remove any internal termination now so that you can easily
add/remove units to the chain in the future. Use a C50 terminator
externally)
-------------
SCSI TERMINATION: 
ONLY (1) per each END OF CHAIN !!!!
If your drive isn't on the END OF THE CHAIN you will need to remove
the (3)terminator resistors in the unit OR move the drive to THE
END...
 (been explained in force by Harold Hislop of Apple2 fame....)
 

Thanx,  Greg
greg dot chi via snet dot net