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From: Gaia (all posts)
Date: 2002-01-18
Subject: Re: Tap files
> I haven't used mtap, but I have one question: does it have a special
> option for plus/4 tapes? I ask this, because the plus/4
uses considerably

Not only it has a special option for the 264 family, but also a special wave mode that makes mtap to encode half sinus waves only.
This was necessary, as some plus/4 turbos used asymmetric sinus waves ! Also in some cases (like with the popular HER TURBO), the sinus waves were inverted, thus the traditional MTAP format was not capable to encode them properly.

I tried a lot of turbos myself, including the infamous Hungarian "noisy" turbo,
which I couldn't get to work at all. It might be a bug in MTAP, as if I tried to save into MTAP format from my emulator (Yape) with this turbo it loaded back properly, but it never worked with a real MTAP-ped file...
There are several other kind of turbos that failed, although I never found the time to have a look at them (and also not a real expert in it). I sent those MTAPs to the author (Markus Brenner), but he hadn't replied :(

The source for MTAP is also available, so competent people with some time could have a look at it...... I guess a lot of people on this list did write some sort of turbo themselves :-)

Attila

> lower frequencies than other Commodores. I think that there's also a
> slight difference in the pulse streams; see the source code of c2n (the
> driver software for my RS-232-driven datasette emulator C2N232). The -2
> option selects plus/4 timings.
>
> Marko

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