Deja Vu #09 13 ноября 1999

Железо

drop of solder - The decision PROBLEMS 1.2MB drive.

(C) Dmitry Belkevich
__________________________________________



     Addressing 1.2MB floppy drive

                on the Spectrum



                   Salute to all!


   Electronics drives is usually
of 2-3 cards. One of the boards, combined with the engine 
rotating disk, we call it a fee. To her the main board is 
suitable tourniquet with wires. In this bundle, as a rule,

there are such signals: general, +12 v,
Start the engine, sometimes +5 v, sometimes the signal from the
optocoupler write prot, and usually the most interesting 
speaker wire - the wire speed switching engine drive. 

   Well, I think you will find this wire. General and 12v soon 
disappear, the alarm inc engine too, optocoupler for inserting 
a floppy disk, well 5v one can resist vyschemit. Well

Now the main thing. See where the wire comes from the board 1 
on the main board. In short, the point is that on this wire

Change log. Level 0> 1 or a 0. This can produce a few jumpers.
Make sure to suit a jumper wire. Look at what levels in 
different pins the jumper if it is different - move the 
opposite of what it was. If the same - looking for somewhere 
else a jumper that needs to be rearranged. But we can do not 
bother with the jumpers - simply lift jumper, and submit to the 
middle pin of the corresponding log level - opposite of that 
was. On some drives do not jumpers on the main board, changing 
the speed of the engine. In this case, try to remove the board 
1. Sometimes there are not soldered jumper (ie, holes are,

but most do not have the jumper) - it can dopayat, some fdd 
this helps. If it did not help - look, can you

is ms engine management HAnnnnn, nnnnnn
I do not remember. So, it has, in my opinion, 6
or 7 foot precisely controls the speed
rotation. If anyone would modify - not
lazy, throw in an echo to what specific step signal. Fdd, mainly
collected on such ms - look at the
what exactly comes with leg loops
signal - he usually goes straight to the chip, fdd hand there, 
he would have looked. About the current account - do not care, 
everything works normally, plus the same start writing \ 
formatted HD diskettes that have not previously written. 


    Well, good luck with revision!!