A quick reference for dumping Spectravideo and MSX tapes.
In the first image we see the signal coming from a Spectravideo tape side dumped with default settings in DC2N4-LC (i.e. without the “Use halfwaves” option active): this tape side can be dumped without any concern.
The second image shows the signal coming from the opposite side of the same tape dumped again with default settings in DC2N4-LC (i.e. without the “Use halfwaves” option active): this tape side at the moment requires re-dumping with the “Use halfwave” option enabled in DC2N4-LC.
In order to produce a TAP file readable by TAPClean in the latter scenario, the dc2n3-conv tool has to be used as per below (as it’s the only tool I make available that supports DMP format 1, the version used when dumping with the “Use halfwave” option enabled):
dc2n3-conv.exe -f -a CrypticCube_SideB.DMP
As I commented earlier today, I am looking at ways to streamline the process in DC2N4-LC GUI clients with some sort of dumping profiles that would expose all dumping modes while avoiding confusion about which option to use in each case.
Bear in mind that the DC2N4-LC commandline client copes with the second scenario without having to enable the “halfwave” option, using the “-r” option:
DC2N4 dump utility, rel 2.3 - (C) 2015-2016 Luigi Di Fraia Communicates with a DC2N4-LC device to make tape backups Usage: dc2n4-dump.exe [options] <virtual serial port> <file> Options: -m <machine type> : 0 = C64/Generic, 1 = VIC20, 2 = C16 -v <video standard> : 0 = PAL, 1 = NTSC -r : change first active edge to rising (default is falling) -b : set both signal edges as active after first (default is single)
The DMP file thus produced can be fed directly into TAPClean without having to use the dc2n3-conv tool.
Yes, that means that at the moment the commandline client for DC2N4-LC does expose all dumping modes available through the hardware and firmware and is more advanced than the GUI clients 🙂