Fairlight-CMI

Well, I found a stumbling block with this Series I...

When trying to boot the machine, neither floppy drive is working.

The drives in this machine are both Qume drives - a DT/8 and an 842.  
The PCBs on the drives look to be identical.

Looking at the drive PCBs, it looks as though these may not be the 
original drives from the Fairlight.  I pulled out my IIx service manual 
and it lists that the standard Mitsubishi drives need to be configured 
with jumpers on shorting blocks:

JFC, PS, SE, DC, M2, S2, I, R, IT, MS, MO, RFA, HR, A, HUN, WP, DS, 2S, 
RM, and a wire link option on Y

While the Qume drive is lacking some of those jumper designations, it's 
only got jumpers on shorting blocks:

Y, C, and DS1 (DS2 on the second drive)

Additionally, both drives have the terminating resistor packs present, 
which should be a no-no, as far as I recall.

Does anybody have any insight on these drives and how they should be 
configured?

Thanks,

Tim



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Tim,

You did not mention where you live (US?) and where this machine comes
from. From earlier posts I understand that in the early days the floppy
drives were mains-frequency dependent. This means if you live in Europe,
you had 50 Hz drives and for the US and Canada you had 60 Hz  drives. They
may be spinning too fast or too slow, depending on where you are and the
origin of the machine.

Regards,
Harald.

> Well, I found a stumbling block with this Series I...
>
> When trying to boot the machine, neither floppy drive is working.

> The drives in this machine are both Qume drives - a DT/8 and an 842.
> The PCBs on the drives look to be identical.