On 14.07.2020 14:22, Marek wrote:
> On Tue, 14 Jul 2020 12:42:57 +0200, "J.F."
> <j...@p...onet.pl> wrote:
>> Przypomina mi sie jakas przystawka, ktora umozliwiala backup danych na
>> video.
>> Ale czy to byl pecet czy  Amiga ...
>
> Ile megabitów/s wyciągała?

Raczej ile bajtów/s :-)

There are special backup modes for Amigas with an 68020 or higher CPU
(A1200, A2500, A3000, A4000). The first one gives a speed improvement of
a factor 2 compared to V1.5, without data compression. The typical
thoughput in this case is 85MB per hour, for a total of 340MB per 4-hour
video tape! The 68020-compressed mode adds data compression to this, and
is up to 3 times as fast as V1.5 (depending on the compression ratio
achieved). With 130MB per hour, 520MB will fit on a 4-hour tape! On an
68000 Amiga, the throughput is about 40MB per hour.