) (09/28/88)
Hello all,
Well, here is a REAL strange problem.......First, let me explain my
configuration. I have a Mac II with TWO disk drives connected to the INTERNAL
SCSI connector (the 50-pin connector). One is AN APPLE 80MB and the other is a
Maxtor XT-2190 connected to the Adaptech 4070 board. The Apple uses the
internal power supply and the XT-2190 uses an external power supply, but they
are both connected to the same power strip, no ground differential....It looks
like this:
+------------------------[===]--------------+
|Mac II Case Externl |
+-----+ | SCSI DB-25 |
+-------+ | | | +---------+ |
| Maxtor| |Adap-| | |Apple 80 | |
| XT2190| |Tech | | |SC intrnl| |
| +----+4070 +-------+ +-----[===] Internal |
| | |cntrl| | | | SCSI 50-pin |
| | | | | | | |
+-------+ | | | +---------+ |
+-----+ | |
| |
+-------------------------------------------+
I made my own 50 pin SCSI connector with 3 sockets on it to connect to the
Mac II, the Apple Drive, and the Adaptech 4070 controller board. Note: I
did NOT remove any terminators. When I tried to remove any of the 3 resistor
packs on the Apple 80mb drive, it did not work, giving a Sense error or
something...
Everything worked perfectly for 3 weeks now. I turn on the external XT-2190,
then power on the Mac, it waits for the disk to finish spinning up and then
boots it. Great!!!
It worked fine up to last night. It worked, I powered it all down and came
back later to do some more work. I powered up the MAC first by accident and
then switched on the XT-2190. The Mac booted the Apple 80mb. I said 'Fine,
it didn't see the XT-2190 quick enough'. But then the Finder didn't mount it
although I saw the disk access light come on and off 2 times. So I installed a
new driver to the XT-2190 with no problem, Finder still doesn't see drive. I
run the CDEV SCSI Tools by P. Mercer to mount disks, it sees the XT-2190 at
SCSI Id=1, but crashed the Mac when I hit the MOUNT button.
I reboot, get the standard chime, then when the XT-2190 comes up to speed, I
see one disk access and then the Mac does a 4-CHIME in-a-row, each a higher
note then the previous chime sound and goes to a dark blue screen and sits
there. If I boot a floppy, the 'Welcome to Macintosh' message appears, but as
soon as the XT-2190 comes up to speed, the 'Welcome' box starts flickering....,
HELP!!! What happened?????
Phil Huntmacman@ethz.UUCP (Danny Schwendener) (10/01/88)
As you already doubted it, the two-tone signal generated by the mac signifies that the boot-up hardware tests weren't successful. The four tone chime that follows signals that the macII entered the test monitor (a goodie that can only be used by your tech rep, as it requires a special scsi test board to be connected). The monitor is automatically entered upon a failure in the startup tests. Now to your problem. As far as I can tell from your posting, the problem is with the adaptec board, not with the SCSI port. Try to disconnect the board and reboot. The Mac should boot with the internal drive without any problems. If you still get the failure sounds, well... you'll need one of these motherboard swaps (you know that lightbulb joke, don't you?). -- Danny +-----------------------------------------------------------------------+ | Mail : Danny Schwendener, ETH Macintosh Support Center | | Swiss Federal Institute of Technology, CH-8092 Zuerich | | Bitnet : macman@czheth5a UUCP : {cernvax,mcvax}ethz!macman | | Ean : macman@ifi.ethz.ch Voice : yodel three times | +-----------------------------------------------------------------------+