> On 2019-01-03, at 15:38, Gerrit Heitsch <gerrit@laosinh.s.bawue.de> wrote: > > On 1/3/19 3:15 PM, Francesco Messineo wrote: > >> I remember nobody ever tried to find "QD" disks, normal DD 48TPI disks >> were used (albeit I remember good quality brands were purchased >> usually, like 3M, Olivetti). > > When I bought a whole lot of C64, 1541, an Amiga 2000A and some other stuff in 2011 for 20 Euros total on ebay (those were the days...), the lot also included about 500 floppy disks. When making D64 images from them, I came about a few QD disks, so they did exist. They did. I got some from Ruud when we exchanged our SFD1001s some years ago :-) > Back when Type II was established, the type II tapes had an extra notch next to the erase control tab and most recorders had a sensor that detected the type that way. Wasn't something like this also added for type IV as well? Yes, there was. And I hated it ;-) I always kept buying decks, which allowed me to manually adjust/select Bias/EQ. Mostly because I wanted to play all types using 70us EQ rather than 120us enforced by automatic detection. Simply disabling the switch wasn't an option as it disabled also bias adjustment for recording. For your question - the Type IV (aka "Metal") had two additional notches along the upper edge, closer (about half way if memory serves) to the centre. -- SD! - https://e4aws.silverdr.com/Received on 2019-01-04 11:00:37
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