City #12 14 мая 1999

Железо

Iron - how to connect a second drive to the Spectrum.

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                  PLANET SHELEZYAKA
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(C) V. Kazakov


      How to Stop Worrying and CONNECT

        Second disk drive to your computer


  Today I will give some useful tips that
should help you when you connect the second drive
your SPECTRUMu.

1.For connect a second disk drive 3,5 "uses the same cable as 
for a five inch floppy drive, only when you connect to swap the 
wires 10 and 12. However, by default one of the drives will be 
selected as the drive A, the second - as the drive B. 

2.Esche would be better if you build a small device that allows 
you to easily reassign drive A to B and vice versa. Here's his 
diagram: 

about
t 10> ■ SA1

to> 10
about 12> ■ to
n
m H
p F
on M
l D
L H> 12
e T
p M
and D

3.For order not to overload the line of disk interface in one 
of the drives if you have 2 five inch floppy disk or a five 
inch, if you are 3,5 "and 5,25", remove the resistor assembly 
is installed in the socket, such as integrated circuit. 

4.Obychno when running one of the drives begin
rotate engines on both drives, which, of course, is 
undesirable. This is easy to avoid if instead of the signal IAC 
(motor included, 16 wire) to drives signals to drive select 
drive select 1 and 2, that is the same 10 and 12 conductors 
loop. 

5.Dlya work with three-inch drive personally, I use a floppy 
disk 2HD 1,44 Mb, which, when capping window on the right hand 
floppy opaque film, easily formatted for 720 kb.