Connecting DDI-2 to 3.5 floppy

[TFM]

You can switch the motor by hand on:


In Basic: out &fa7b,&ff


Or use FutureOS Porting System.

[roy bates]

some power supplys require alot more load to be stable on the 5 volt rail,than a floppy can supply.

[Bryce]

Well, the issue is solved. So, I completly cleaned the computer, and cleaned the connectors with alcohol  as Piotr recommanded.
=> No improvement.
I decided to test again the power supply. I took an old PC (that is still working), and used it power supply ... Yeah ! It worked !
This mean that my power supply does not work. But what is strange, is that I have the correct tension ! Perhaps it is not stable enough.
I'm not lucky, because, first, I tested two power supply which does not work !


Thanks a lot everybody !

If you measured the voltage while it was trying to access the drive, you may have noticed that it was then falling well below 5V because of the load.

Bryce.

[landru]

Sure.
Now I found a more compact power supply. I can use it for the floppy drive and for the amstrad. But I can see on the screen when the motor is running : the amstrad and the floppy must share the available power    !
=> 5V : 1A
=> 12V : 0.25A

[TFM]

IMHO 1 A on 5 V is pretty few. It may work with CPC and floppy, but not with extensions.


The original CPC monitors supply 1.7 A on 5 V (IIRC). You can check that in the wiki.

[kevin.c]

IMHO 1 A on 5 V is pretty few. It may work with CPC and floppy, but not with extensions.
The original CPC monitors supply 1.7 A on 5 V (IIRC). You can check that in the wiki.

TFM you are quite right. For instance, my cpc6128 consumes ca 1,4A  on standby. Avarage 3,5" floppy drive require  0,8-1A on 5V  with motor on and head positioning. One Amper  power supply will be for sure overload.