11 Mar
2005
11 Mar
'05
10:25 a.m.
Randy McLaughlin <cctalk at randy482.com> wrote:
I am 99.99% sure it changes the RPM, I have some TEAC
1.2's laying around
I'll plug one in and ground pin 2 to check it.
For the TEAC it is enabled via an option jumper, default is to ignore it.
Changing the RPM is an option on SOME drives, and for PeeCees to work it
must be OFF. It is very useful for Classic Computers, though.
The high density select signal (pin 2) may or may not switch RPM, but it
always switches the write current. Writing on HD media with DD write current
will produce no effect (the field is too weak to affect the media), while
writing on DD media with HD write current will magnetise the media so
strongly that it'll be impossible to rewrite and unusable until you
bulk-erase it. So pin 2 MUST always select the correct write current for
the media type.
3.5" drives use the media type hole instead to select the correct write
current. Those who punch or cover that hole to magically "change" the
media type get what they deserve.
MS