The 50kHz
Sound
Modeling
Upgrade
Kit
requireo that the
K250 had Version 2.2 installed. The. sampling EPROMs
on
the CPU
board needed
to· be replaced with part no: 82000412 at U25, part no.
82000413 at U40, part no. 82000414 at U26; and part no. 82000415
at U41. The
AID
converter at U60 Ion the Channel board must be
replaced with part no. 63001701 and one cut and one jump is
required.
Note:
When installing the 50kHz Sound Modeling Program or
the
50kHz Upgrade kit, the cut and jump to the Channel board
is
not
necessary
on
the K250X. Every K250X produced had this modification
already performed. Also, modifications to the CGP board required
for
Sound Block A and sampling are not required.
2.7
-
March,
1986
Version
3.1
software--pu
rchased option
Enhanced
Resident
Sound
Block--purchased
option (new
CGP)
Sound
Block
8 (Rock Block)
The installation of
Version
3.1
in
K250s required cuts and
jumps
to
the CPU board. These modifications were required
to
add
the
additional 4K memory and to reconfigure the board for the
installation
of
256K EPROM (CPU until this point used 128K EPROMs).
Version
3.1
also required units with 25kHz sampling to be
upgraded
to
50kHZ sampling. Because Version
3.1
supported a 12K
sequencer memory, units with
only 4K had to be upgraded to 8K. The
installation of Version
3.1
involves installing the Version
3.1
EPROMs at the following locations:
82101401
82101601
82101801
82090401*
U54
U53
U52
U51
82101501
82101701
82101901
82090501*
*50kHz Sound Modeling EPROM locations
, -
Kurzweil
250
Service Manual, Chapter 2
2 - 7
U38
U37
U36
U35
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