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Draysoft Doubler

3 bytes added, 11:15, 18 April 2010
/* Technical */
* '''Port Conflicts:''' Port F0E0h may conflict with various [[Peripherals]] (which often decode only 1-2 address lines being low). Moreover, it conflicts with the internal Port F4XXh (PPI.PortA, which decodes only A11,A9,A8). To the worst, while running the Doubler software, PPI.PortA is set to 00h, so the Draysoft hardware must output a very strong HIGH level to pull-up the PPIs LOW level.
* '''Doubler software''' (Side A) executes an endless loop that forwards changes on Port F0E0h.Bit5 to PPI.PortC.Bit5 (and also to the Screen Border color). The software doesn't attempt to decode data blocks, it just forwards the data, and thus also works with any kind of non-standard data blocks. Similar results can be gained using a normal Dual HiFi Tape Deck - the advantage of the Draysoft method is that it outputs 'harder' digital transitions, however, it does add some timing inaccuracies, so the copy isn't exactly the same quality as the original.
* '''Speedcop software''' (Side B) is a baudrate conversion tool, allowing to select 1000, 2000, or 3000 bps (it's using only the internal recorder, ie. this program is not using the external hardware at all).