HP AlphaServer & AlphaStation DS15 & DS15a systems include a single, 1-GHz CPU with 2-MB onboard ECC cache. Memory capacity expandable to 4GB max. using 1GB DIMMS, Onboard dual 10/100 BaseT Ethernet ports, Four 64-bit PCI expansion slots.
Onboard Ultra160 SCSI controller. Choice of storage cage subsystems: DS15A Internal Storage Cage or DS15A Front Access Storage Cage. Two serial ports: COM1 port is both an RMC port with modem control and a full-duplex asynchronous communications port.
System supports Tru64 5.1B-v4 and OpenVMS 7.3-1 onwards... The Alphaserver DS15 and DS15a are identical and interchangeable.
The only difference is the Alphaserver DS15a is RoHS Compliant whereas the Alphaserver DS15 is not.