Kurzweil Music Systems K2500R, K2500, K2500X Specifications

Z

Choosing and Installing SIMMs for K2500 Sample Memory

NOTE:

CAUTION:

PAL or other additional circuitry to make multiple DRAM chips act like bigger chips. Non­composite SIMMs (acceptable) have no chips other than DRAM memory chips soldered to the
board. SIMMs with PALs, buffers, or other logic components will not work in a K2500; do not
use them. Composite SIMMs may appear to work in some cases, but they will be unreliable.

SIMMs are not user-installable. Refer all work to a qualified service center.

Single In-Line Memory Modules, commonly referred to by the acronym "SIMM", are the small
memory cards that the K2500 uses for Sample RAM. Early K2500 models take up to eight 30­pin SIMMs; K2500s with a rev. K or later mother board take up to two 72-pin SIMMs. In either
case, however, 128 Megabytes of Sample RAM is the maximum. To determine the SIMM
requirements of a K2500 without disassembling the unit, check its serial number; a "Z" as the
seventh character (e.g., 479501
board and requires 72-pin SIMMs. K2500s with a "0" as the seventh character of the serial
number use 30-pin SIMMs.

Do not use composite SIMMs in any K2500. A composite SIMM is one that uses a

SIMMs for 30-pin sockets

K2500s with mother boards earlier than rev. K will only accept 30-pin non-composite SIMMs.
Allowable sizes are 1 MB, 4 MB, and 16 MB, in either 8-bit or 9-bit configurations. The
SIMMs must have an access time of 80 nanoseconds (ns) or faster. The maximum height and
width of a 30-pin SIMM for the K2500 is 30mm x 90mm (approximately 1.2 inches x 3.5
inches). Below is a partial list of 30-pin SIMMs that work with the K2500:

00001) indicates that the K2500 has a rev. K or later mother

Hitachi HB56A48A; 4Mx8
Hitachi HB56A49A; 4Mx9
TI TM124EU9B, TM124EU9C; 1Mx9
TI TM497EAD9B, TM4100EAD9; 4Mx9
TI TM4100GAD8, TM497GAD8A; 4Mx8
TI TM16100GBD8;16Mx8
TI TM16100EBD9;16Mx9
NEC MC-421000A8B; 1Mx8
NEC MC-424100A8B; 4Mx8
NEC MC-421000A9B; 1Mx9
NEC MC-424100A9B; 4Mx9
Tosh THM81000AS, T osh THM81000BS, Tosh THM81070AS; 1Mx8
Tosh THM91000AS, T osh THM91000BS, Tosh THM91070AS; 1Mx9

SIMMs are always installed in adjacent pairs, in the following slots: 1 and 2, 3 and 4, 5 and 6, 7
and 8.

Part No. 910303

Choosing and Installing SIMMs for K2500 Sample Memory

SIMMs for 72-pin sockets

K2500s with rev. K or later mother boards will only accept 72-pin non-composite SIMMs, in
sizes of 4 MB, 8 MB, 16 MB, 32 MB, 64 MB, and 128 MB. The SIMMs can be in either 32-bit
or 36-bit configurations, and must have an access time of 80 nanoseconds (ns) or faster.

Although K2500s with rev. K or later mother boards have two SIMM sockets, some SIMMs
cannot be paired with other SIMMs, whether of the same or a different size. The table below
shows the acceptable 72-pin SIMM configurations, and indicates which sizes can be combined.

Size Configuration Pair with other SIMMs?

4 MB 1Mx32 or 1Mx36 Yes

8 MB 2Mx32 or 2Mx36 No
16MB 4Mx32 or 4Mx36 Yes
32MB 8Mx32 or 8Mx36 No
64MB 16Mx32 or 16Mx36 Yes

128MB 32Mx32 or 32Mx36 No

Configuration Chart for 72-pin SIMMs.

For example, a 4MB SIMM can be combined with another 4 MB SIMM to create 8 MB of
sample memory. Similarly, a 4 MB SIMM could be paired with a 16 MB or 64 MB SIMM. It
could not, howev er, be paired with an 8 MB, 32 MB or 128 MB SIMM. If you use an 8 MB, 32
MB, or 128 MB SIMM you cannot use the other SIMM socket.

Below is a partial list of 72-pin SIMMs that work with the K2500:
Mosel Vitelic 404J232 8MB
Hitachi HB56U132 4MB

HB56A232BA/SBA 8MB
HB56A832BA/SBA 32MB

Oki MSC232B132A-xxBS2/DS2 4MB
MSC232B2321A-xxBS4/DS4 8MB
MSC232B2322A-xxBS4/DS4 8MB
MSC232B432A-xxBS8/DS8 16MB
MSC232B832A-xxBS16/DS16 32MB

TI TM124BK32F 4MB
TM248BK32F/BK32U 8MB
TM497BBK32F/BBK32S 16MB
TM893BBK32F/BBK32S 32MB

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