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8844 SCSI host to Pertec peripheral

Introduction

The DIL 8844 is a microprocessor controlled board developed to enable Pertec Interface Magnetic Tape Drives to be connected to SCSI host platforms.

The 8844 implements a custom designed chipset comprising of a dual channel Direct Memory Access (DMA) controller and a Pertec Interface controller which together allow a high data transfer rates across both host and slave interfaces simultaneously.

Primary applications are in the communication and telecoms industry where modern exchanges using SCSI interfaces still rely upon Pertec ½" magnetic tape units (MTU's) to record logging and billing information.

More recently the 8844 is being applied in the open systems environment where information stored on tape has to be compatible between platforms and interfaces.

Features

• Single Ended or Differential 8 Bit SCSI Interface.
• Asychronous or Synchronous transfer negotiation.
• Switch selectable magnetic tape error recovery routines
• Switch selectable SCSI parity error checking.
• Switch Selectable RS232 monitor program allows display of operation and diagnostics
• Host parity maintained to tape drive.
• Firmware selectable SCSI emulation's.
• 256Kbyte (9bit) cache buffer.
• NRZI, PE, DPE, GCR supported.

Performance

Transfer rate: 5.5 Mbyte/s Sychronous. 4.5 Mbyte/s Asynchronous

Specification

Power S/E: 890 mA quiescent 1100 mA operational
Diff:1100 mA quiescent 1310 mA operational

Supported equipment

Pertec interface drives supported:

Cipher, M4, Thorn, Fujitsu, Kennedy, Pertec, Telex etc.

SCSI host platforms:

Sun, DEC, IBM, Data General etc.