Python is the code name for the first generation of DAT tape drives
originally trademarked by Archive Corporation which was later purchased
by Conner Peripherals, which later merged with Seagate Technology's Inc..
The Python DAT drives are fully DDS, DDS-DC, DDS-2, SCSI 1, and SCSI-2
compliant. Capacities range from 1.3 gigabytes and up to 8 gigabytes
(using hardware compression). All Pythons adhere to standard SCSI
specifications. Python devices have single ended passive SCSI
interfaces. The internal tape units utilize 11-pin resistor pack
terminators rated at 220/330 ohms. External tape units utilize an
external 50 ohm passive SCSI terminator. A Python drive is identified
during system boot up as an "Archive Python xxxxx-xxx" (xxxxx-xxx
indicating firmware part number) and if the system allows the firmware
version will also be listed. Python drives use 2.xx or 4.xx firmware.
The python family encompasses approximately 80 different models which
have been sold under different marketing skews and configuration.
The Peregrine family of DAT's are second generation drives which were
put into production in early 1995 by Conner Peripherals. They were
direct replacements for the Python drives. Capacities range from 2.0
gigabytes and up to 8 gigabytes (using hardware compression). All
Peregrine DAT drives are fully DDS, DDS-DC, DDS-2, compliant and contain
an embedded SCSI controller that supports SCSI-2 (ANSI X3.131, 199x).
Drives are equipped with a 1 megabyte on-drive buffer. These drives
provide a native transfer rate of 400 kilobytes/second (KB/sec) before
the additional enhancement of hardware data compression. In addition all
Peregrine drives are equipped with flash EEPROM's but are still
identified on system boot up as an "Archive Python xxxxx-xxx" for
compatibility reasons. All Peregrine drives display a firmware version