The Leaders in SCSI Technology
Two basic approaches to data transfer are taken when dealing with S.C.S.I. devices on a PC, Programmed I/O (PIO) or Bus Master.
Programmed I/O is the cheaper and simpler solution. The PIO approach is very similar to the method used for data transfer with I.D.E. (ATA) Hard Disk Drives. The penalty is reduced processor performance, since all data I/O to a S.C.S.I. device requires the direct attention of the processor. PIO is usually quite satisfactory on single user machines.
Bus Master handles data transfers from S.C.S.I. devices using D.M.A., (Direct Memory Access) freeing the processor from this task. Bus Master produces a substantial improvement in system performance, and is recommended in data intensive systems, such as file servers.
To ease installation and operation, Adaptec also market a range of S.C.S.I. support software for the P.C. Adaptec EZ-SCSI is a high performance, easy to use support package for the entire range of Adaptec Host Adapters.
| Code | Item Description | Retail Price | Warranty |
|---|---|---|---|
| AHA1505VARK | 16 bit ISA SCSI-II PIO Host Adapter Kit, includes EZ-SCSI Lite Software and internal S.C.S.I. ribbon cable, Non - Bootable for CD ROM only | $122.00 | 1 Year |
| AHA1520B | 16 bit ISA PnP SCSI-II PIO Host Adapter (NO Floppy Drive Support) | $142.00 | 1 Year |
| AHA1520BK | 16 bit ISA PnP SCSI-II PIO Host Adapter (NO Floppy Drive Support) Kit, includes EZ-SCSI Software and internal S.C.S.I. ribbon cable | $280.00 | 1 Year |
| AHA1542CP | 16 bit ISA PnP SCSI-II Bus Master Host Adapter | $437.00 | 1 Year |
| AHA1542CPK | 16 bit ISA PnP SCSI-II Bus Master Host Adapter Kit, includes EZ-SCSI Software and internal S.C.S.I. ribbon cable | $553.00 | 1 Year |
| AHA2742AT | 32 bit EISA SCSI-II Bus Master Host Adapter Twin channel supports 14 devices (and 2 x FDD) | $594.00 | 1 Year |
| AHA2742ATK | 32 bit EISA SCSI-II Bus Master Host Adapter Kit, includes EZ-SCSI Software and internal S.C.S.I. ribbon cable. Twin channel supports 14 devices (and 2 x FDD) | $671.00 | 1 Year |
| AHA2920CK | 32 bit PCI PnP SCSI-II PIO Host Adapter Kit, includes EZ-SCSI Software | $313.00 | 1 Year |
| AHA2940A | 32 bit PCI SCSI-II Bus Master Host Adapter | $428.00 | 1 Year |
| AHA2940U | 32 bit PCI ULTRA FAST SCSI-3 Bus Master Host Adapter | $454.00 | 1 Year |
| AHA2940UK | 32 bit PCI ULTRA FAST SCSI-3 Bus Master Adapter Kit, includes EZ-SCSI Software and internal ribbon cable | $555.00 | 1 Year |
| AHA2940UW | 32 bit PCI ULTRA FAST WIDE SCSI-3 Bus Master Adapter | $555.00 | 1 Year |
| AHA2940UWK | 32 bit PCI ULTRA FAST WIDE SCSI-3 Bus Master Adapter Kit, includes EZ-SCSI Software and internal ribbon cable | $642.00 | 1 Year |
| AHA3940AUK | 32 bit PCI DUAL CHANNEL ULTRA FAST SCSI-3 Bus Master Adapter Kit, includes EZ-SCSI Software and internal ribbon cable | $897.00 | 1 Year |
| APA358K | Standard and Enhanced Parallel Port to SCSI-II Adapter Kit, includes SCSIworks software and cable | $262.00 | 1 Year |
| APA1450B | PCMCIA (Type II) to SCSI Adapter, includes cable and Win '95 support software | $223.00 | 1 Year |
| APA1460B | PCMCIA (Type II) to SCSI Adapter, includes EZ-SCSI software and cable | $363.00 | 1 Year |
| ASWEZSCSIV4 | EZ-SCSI V4.0 Software (for Windows 3.11 / Workgroups 3.11 / Windows 95 / Windows NT / DOS) | $121.00 | 90 days |