#NEC 84 and Adaptec 1742
10-Jan-93 22:17:04
Sb: #36474-#NEC 84 and Adaptec 1742
Fm: Clarke Ferber 75470,1676
To: Daniel Bayerdorffer 73527,3222
If ASPIEDOS.SYS does not list the drive with the /D switch then it's not
seeing the unit at all.
In a SCSI bus the devices at each end of the cable _must_ be terminated,
while all devices in between the ends of the cables must be free of
termination resistors.
For example:
[HARDRIVE]—————[1742]
Terminated Terminated
[HARDDRIVE]———[CDROM]——–[1742]
Terminated no-term Terminated
or
[CDROM]———–[HARDRIVE]——-[1742}
Terminated no-term terminated
or
[HARDDRIVE]——-[1742]———–[CDROM]
Terminated no-termination terminated
Tell me a little about your system, and i'll try and figure out whats going
on. If the NEC is an external unit, then you will need to pull the resistors
off of the 1742 card (just below the ribbon cable). If your running the
CD-ROM between the hard drive and controller in an internal configuration
then you should already be working (I dont the NEC comes with internal
termination). If you have added the CD-ROM to the end of the same cable as
the hard drive is on then you will need to remove the termination of the hard
drive (resistor packs underneath by the ribbon cable), and add termination to
the CD-ROM. I'm not famililar with the NEC units, but I think they should
come with a termination adapter that you plug into the drive and then plug
the cable into the adaptor.
Hope this helps, but give me some more info on your configuration if it
does not.
-C