KnowledgeBase | K2600X | Sampling

Sample RAM Specifications for the K2600 Series (SIMMs)

What are the specs for Sample RAM (SIMMs) for my K2600/X/R/S?


Choosing Sample RAM for the K2600 Series

Single In-Line Memory Modules, commonly referred to by the acronym "SIMM", are the small memory cards that are used for Sample RAM in the K2600 series instruments. The K2600 is designed so that the user can install the SIMMs. This is documented in the K2600 manual.

IMPORTANT: Do not use composite SIMMs in any Kurzweil instrument. A composite SIMM is one that uses a PAL or other additional circuitry to make multiple DRAM chips act like bigger chips. Non-composite 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 K2600; do not use them. Composite SIMMs may appear to work in some cases, but they will be unreliable.

K2600 SIMMs Specification

K2600's support up to 128MB of sample RAM in two slots. They are user installable. SIMMs must meet the following specs:

  • 72-pin
  • The K2600 can use either 5 volt or 3.3 volt SIMMs*.
    (*An internal jumper must be set to match the correct voltage SIMM. If installing 2 SIMMs, both must be of the same voltage type. This is documented on the inside of the panel which is removed in order to install the SIMMs.)
  • Must be non-composite SIMMs
  • Allowable sizes are 4 MB, 8 MB, 16 MB, 32 MB, 64 MB, and 128 MB
  • Either 32-bit or 36-bit configurations supported
  • 80 ns or faster
  • Both EDO and FPM SIMMs supported

Though equipped with 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
16 Mb 4Mx32 or 4Mx36 Yes
32 Mb 8Mx32 or 8Mx36 No
64 Mb 16Mx32 or 16Mx36 Yes
128 Mb 32Mx32 or 32Mx36 No

For example, a 4 MB 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, however, 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.

For a list of companies that make SIMMs which we know work correctly, please see our Developers List. (Other companies may also have proper SIMMs).

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