8280 Jumper Settings

I checked my 8280 and my brain is not failing me, the drive motors do 
indeed switch off ~20 seconds after a disk is inserted and door is 
closed, and after any subsequent operation is completed.

I checked the jumper settings on my drive and M1 and M3 are closed, and 
M4 and M2 are open. These setting are the standard "as shipped" option. 
Some images of the drive PCB, a jumper location guide, and the motor 
control switches as set on my drive can be found here: 
http://www.inchocks.co.uk/commodore/8280/

 From page 1-22  of the TMS848-2  service manual:

----->

M1 is used to enable the motor off delay timer. When this jumper is 
installed, the drive motor is enabled and disabled by either the drive 
select (M3) or head load (M4) commands. A 20-second turn off delay of 
the spindle motor is activated on the trailing edge of the controlling 
signal.

M2 is used for radial motor control independent ofthe motor control 
functions installed with M1, M3, and M4. M2 should be in ifthe user 
wishes to enable the drive motor continuously or to use the radial motor 
on line MC1-MC4.

M3 is used to control the drive motor using drive select. When the drive 
select line goes low (true), the drive motor comes up to speed in less 
then 500 milliseconds and becomes ready in less than 700 milliseconds. 
After the drive select line goes false (high), the motor will run for 20 
seconds. To implement this option, install a jumper at location M3. For 
correct operation of M3, remove M4.

M4 is used to start the drive motor using the head load interface lines. 
When the head load line goes low(true), the drive motor comes up to 
speed in less than 500 milliseconds and becomes ready in less than 700 
milliseconds. After the head load line goes high (false), the motor will 
run for 20 seconds. To implement this option, remove M3 for correct 
operation of option M4.

<-----

Cheers, Rob


On 08/01/2019 13:07, Michał Pleban wrote:
> Hello!
>
> Mike Stein wrote:
>
>> However, later drives like the  Tandon TM-848 actually had a quite extensive set of motor control options; you could for instance turn each of four motors on and off independently, you could turn them on and off with the drive select (with optional turn-off delay), run them constantly, etc.
>>
>> Depending on how the controller handles it you might be able to move a jumper to turn off the motor when not in use if that's what you want.
>>
>> There's a fairly extensive manual for the TM-848 here (see p. 1-22):
>>
>> http://www.bitsavers.org/pdf/tandon/TM848_service_1982.pdf
> Hm, that may explain the difference in behaviour of my 8280 vs. Rob's. I
> will try to study the jumpers on my drives to see how they are set up.
>
> Regards,
> Michau.
>