01-02-2014, 08:16 AM
Like I said, in the real world the LPF cutoff is lower than that, and you do in fact get pulses as low as just under 1us. It's easy enough to see using even a generic scope. Read a disk with the drive door open so invalid flux is generated. On disks themselves, flux transitions are as low as a few hundred nanoseconds, typically during the write splice. So, if you want to "preserve" and emulate the disk exactly, you would need to allow for the complete data. I doubt it matters much for C64 disks, but I want to be as exact as possible.
I am more than familiar with the 1541 schematic. Besides developing RAM boards, digital track displays, and parallel cable add ons, I first developed flux level copying in December of 1984 by replacing the write circuitry in a target drive and using the UE4's output for the source drive. So, 29 years later nothing has changed.
I am more than familiar with the 1541 schematic. Besides developing RAM boards, digital track displays, and parallel cable add ons, I first developed flux level copying in December of 1984 by replacing the write circuitry in a target drive and using the UE4's output for the source drive. So, 29 years later nothing has changed.