SOUND
FILE
ROM
There are' two configurations of Sound File ROM. The early
configuration consists of six rows of ten 256K ROMs per row.
In
that configuration, optional sound blacks are installed
on
a daughter
board. The diagnostic program expects to find'
only Sound Block A
and B
on
the daughter board. The current configuration consists of
two rows of ten 1 M
ROMs each.
In
this configuration, optional sound
blocks are installed
in
the extra rows
on
the CGP board. The rows
are numbered from 1 to 6 starting from the row nearest to the rear
of the instrument. Rows 1 and 2 contain the basic sounds that
all
units produced with this 1
M,
board configuration are produced with.
Row
3
is
reserved for the optional Sound Block
A.
Row
4
is
reserved
for the
optional Sound Block
B.
Row 5 is reserved for the optional
Sound Block
C.
Row 6
is
reserved for the optional Sound Block
D.
There are four checksums per row
in
the current configuration.
If a checksum error occurs during the test, the
ROM
component
number
on
the CGP will be displayed along with the expected
checksum
(GOOD) and the actual checksum (BAD):
show:
EXAMPLE:
CGP
ROM
CHKSUM
ERR
U125
GOOD: 354B BAD: 7894
NOTE: A checksum of
8000 indicates that the
ROM
could
not be
read, or the location
is
empty.
TEST SF
ROM?
Press
YES
LOOP
ON
TEST?
Press
YES
or
NO
As
the sound file
ROM
test proceeds, the LCD display will
TESTING
SF
ROM
ROW
1
TESTING SF
ROM
ROW
2
Kurzwell 250 Service Manual, Chapter 4
4-
4 9
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