At
introduction,
the
Kurzweil
250X
was
introduced
'with
Version
2.1
software. This software. did
not
support sampling and
sampling could not be used with the K250X until Version 2.2, which
will be discussed later. . An important difference between the K250
and the K250X is that every K250X produced had its program EPROMs
contained
in
256K EPROMs. The Kurzweil 250 used 128K EPROMs at
that time.
2.6 -
October,
1985
Version
2.2
introduced--free
update
50kHz
Sound
Modeling
Program--purchased
option
50kHz
Sound
Modeling
Upgrade
Kit--purchased
upgrade
Version 2 software was now
obsolete.
Version
2.2
supported
50kHz sampling and corrected some known bugs
in
Version
2.
It
was
a free update,
but
was only offered to
customers
who were
experiencing
problems or who were purchasing a Sound Modeling
Program
or a 50kHz Upgrade Kit. One thing to note is that if a
customer had a unit with 25kHz
sampling and wanted Version 2.2,
the unit had to be upgraded to 50kHz. The Version 2.2
EPROMs should
be the following:
82051021
82051221
82051421
82051621
U54
U53
U52
U51
82051121
82051321
82051521
82051721
U38
U37
U36
U35
The
50kHz
Sound
Modeling
Program
was offered
in
the
same way the 25kHz options were offered.
Kurzweil continued to
offer two kits (with
or
without Audio board)
for
purchase. The
modifications to the
K250 were basically the same as those outlined
in
the installation procedures for the 25kHz upgrade. However, not
all modifications were necessary for units recently produced.
Kurzweil 250 Service Manual, Chapter 2
2 - 6
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