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O
berheim DPX1 : Upgrades & Add Ons
Factory Upgrades
The Oberheim factory has long since disappeared, and there are no upgrades or spares for the DPX-1 except second hand. There were two factory upgrades, with two vacant slots in the back of the standard DPX-1.
8 Outs and RS422
The DPX-1 could be upgraded with eight individual voice outputs on jacks, and a 9 pin RS422 connector. The RS422 enables the OMI CDROM drive (CDS3) to be connected so that EII CDROM's from OMI can be read. The OMI drives were Sony CD mechanisms with an RS422 interface. They were the first CDROM drives for use with a sampler. The OMI sample disks are very high quality. See the EII section for more info. more »
SCSI A SCSI interface card could be fitted which enabled the DPX1 to link up to the Oberheim HDX-20 Hard Disk Unit (2U Rack). The individual output upgrade is a pre-requisite to the SCSI upgrade. The DPX-1 does not work with ZIP drives.
Memory The sample memory can not be upgraded.
HDX-20 Music Storage System Oberheim produced an add on hard disk unit, the HDX-20, in a separate 2U rack unit. The unit came with a SCSI interface board for fitting into the DPX-1, a 25-pin SCSI cable, upgrade
instructions, a 128 Kbytes memory upgrade for the DPX-1, OS Version 2.2 on two EPROM's, and the actual HDX-20 (which formats to 20 MB). The drive holds a total of 19 sample banks. The Output Expansion upgrade MUST be fitted in the DPX-1,
for the SCSI upgrade to be able to be installed. It contains the necessary SCSI external connector and an interface chip.
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Technical The HDX-20 contains a 5.25" Seagate ST238R
38 MB hard drive, which spins at 3600 rpm, and has an average
seek time of 65ms. The drive has an ST412 interface not SCSI. A separate SCSI interface board sits alongside the drive in the 2U case. The drive formats at 20 MB. This appears to be the maximum space a DPX-1 can format and access.
Multiple Drives The SCSI DPX-1 can support up to 7 external SCSI devices, although the manual recommends only two devices are connected due to the need to keep SCSI cable lengths to a
minimum. An HDX-20 can be shared by two DPX-1's, and a DPX-1 can access mutiple HDX-20's. There are two 25-pin SCSI connectors on the back of the case.
Preloaded The HDX-20 came preloaded with 19 banks of samples. |
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