KnowledgeBase | K2600 | Disk Mode, Drives & SCSI


Ultra 160 SCSI Drives

Question:

Are Ultra 160 SCSI drives compatible with the K2 series models?

Answer:

As technology progresses, it is becoming harder to find drives that are directly compatible with the Kurzweil K2000/K2500/K2600/K2661 products. Although originally designed to work with SCSI-1/2 devices, it is possible to use later-design SCSI drives, such as the Ultra 160 SCSI drives. However, it is necessary to use adapters, and to set the drive for (SE) Single Ended operation. The SCSI interface on the Kurzweil is a SCSI-1 8 bit single ended interface. Newer drives such as the Ultra 160 have a 16 bit interface, and operate with LVD (low voltage differential) connections. It is possible to connect the 8 bit drive controller used in our products to a 16 bit drive. The drive will not be as fast, but it will work. The unused 8 bits on the drive must be terminated. An adapter or cable with high-byte termination is used for this purpose.

Connection Issues between the Ultra160 drives and the Kurzweil.

Kurzweil:

  • SE. Data is Single Ended. The drive must be set for compatibility.
  • Narrow (8-bit) bus.
  • Internal connector; 50 pin Male.
  • External connector; 25 pin D type Female.

Ultra 160 Drives:

  • LVD though SE capable. Data is Low Voltage Differential, though most drives can be set for Single Ended. This is important and necessary, as the drive needs to be set to SE mode to work with any of our products.
  • Wide (16-bit) bus. It is possible to connect a wide drive to a narrow interface, though an adapter is required that will terminate the high byte that is not connected to the 8-bit interface on the Kurzweil.
  • Connector style HD 68 pin Female or SCA 80 pin Female.

Adapters & Cables

As stated above, it is important that when going from the Kurzweil to an Ultra 160 drive, the cable or adapter has high byte termination. We recommend RAM Electronics as a source for cables an adapters which are correctly terminated. If you choose another source for your cables or adapters, please be sure to confirm that they are high byte terminated. In addition, there is a a secondary issue if using an adapter for an internal drive. All of the Kurzweil products (except the K2600R) have limited space to mount the SCSI drive. Drive adapters must be physically small to fit. Several adapters that we tested would not fit in the Kurzweil. In the connection examples below, we have given the RAM Electronics part numbers for the various cables and adapters you might use.

How to connect an internal SCSI Ultra 160 drive SCSI Ultra 160 Drive with HD68 pin header.

  • Make sure to check the power requirements for the drive and check them against the K2 limits (listed here). Generally, only the K2500/2600 keyboards and K2600R can power an Ultra 160 drive.
  • IDC 50 Female to 50 Female cable. Connect one side of this cable to the internal SCSI header, and on to the adapter (described next).
  • IDC50 Male to HD68 Male adapter with high byte termination (Ram Electronics SM-058).
  • Connect the SM-058 adapter to the drive.
  • Make sure that the drive is set for SE mode. This will probably be done with a jumper on the drive. Check the drive literature. Some drives have a jumper setting for Narrow (8 bit) operation. Make sure that this jumper is in place.

SCSI Ultra 160 Drive with SCA80 pin header.

Note: All of the Kurzweil products (except the K2600R) have limited space to mount the SCSI drive. Drive adapters must be physically small to fit. We have not yet found a single high byte terminated adapter that converts from IDC50 Male to SCA80 Male. Therefore, you need a 50-68 pin adapter plus a 68-80 pin adapter, and both these adapters will not physically fit in any product except the K2600R. For this reason, we recommend using a drive with 68 pin connectors, and use a single adapter such as the SM-058. If you do have a K2600R and use a drive with an 80 pin connector, the following would apply:

  • Make sure to check the power requirements for the drive and check them with the K2 power requirements.
  • DC 50 Female to 50 Female cable. Connect one side of this cable to the internal SCSI header, and on to the adapter (described next).
  • IDC50 Male to HD68 Male adapter with high byte termination (Ram Electronics SM-058).
  • HD68 Female to SCA80 Female (Ram Electronics SM-043). Connect this to the SM-058 adapter.
  • Connect the SM-043 adapter to the drive.
  • Make sure that the drive is set for SE mode. This will probably be done with a jumper on the drive. Check the drive literature. Some drives have a jumper setting for Narrow (8 bit) operation. Make sure that this jumper is in place.

How to connect an external SCSI Ultra 160 drive SCSI Ultra 160 Drive with HD68 pin header.

  • DB25 Male to HD 68 Male cable (Ram electronics SCN-44012).
  • Make sure that the drive is set for SE mode. This will probably be done with a jumper on the drive. Check the drive literature. Some drives have a jumper setting for Narrow (8 bit) operation. Make sure that this jumper is in place.

SCSI Ultra 160 Drive with SCA80 pin header.

  • DB25 Male to HD 68 Male cable (Ram electronics SCN-44012).
  • HD68 Female to SCA80 Male adapter with high byte termination (Ram electronics SM-018). Connect to cable and to drive.
  • Make sure that the drive is set for SE mode. This will probably be done with a jumper on the drive. Check the drive literature. Some drives have a jumper setting for Narrow (8 bit) operation. Make sure that this jumper is in place.


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