🚀 go-pugleaf

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  I have written some of the diagnostic software in use here
at Olivetti for their M28, which is an AT-compatible computer,
certainly one of the best to be unleashed to the world.
[No kidding! I've seen other manufacturer's feeble attempts].

  I wanted to check the power-on diagnostic software to see
if it would detect unusual conditions and report them.
I removed various cables, and recorded the message which appeared.
I used an Olivetti M28 prototype computer with a Western Digital
WD1002-WAH disk controller and OPE 5221 disk drive.
[This may or may not be a configuration one can purchase].
Out of this effort I made some observations which I think are
useful to people using AT-like computers.  The results of my
observations are presented below in a quick lookup fashion.

THIS IS NOT INTENDED AS A FIELD SERVICE GUIDE. 
NEITHER OLIVETTI NOR MIKE SLIFCAK ARE LIABLE FOR USING THIS INFORMATION.

  In general, turn the power OFF first.  I like to unplug
the computer from the wall in case there are exposed AC wires
inside the box [found rarely these days-but I'm cautious |-)].
Also, make sure that pin 1 at the controller is connected to
pin 1 at the drive [Ignore color stripes- match numbers or square
solder pads on the printed circuit boards' interfaces].

MESSAGE UPON THE CONSOLE             CONSTRUCTIVE MOTION

1780 Disk 0 failure
1781 Disk 1 failure             re-seat the power cable to the drive.
                                check the power cable at the supply end.
                                replace frayed or broken power cable.
                                re-seat the control cable.
                                replace control cable if message continues.

1782 Disk controller failure    re-seat controller in slot.
                                replace controller if message continues.

1790 Disk 0 error
1791 Disk 1 error               re-seat the data cable.
                                replace data cable if message continues.

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Please post responses to me at:

UUCP:  {hplabs,ihnp4,allegra}!oliveb!oliven!slif

As usual, I thank Olivetti for access to the net,
and I do not represent them in this posting.