neese@cpedev.UUCP (02/02/88)
Let's talk SCSI....... Adaptec has announced the AHA-1540 AT SCSI Host Adapter. I'd like to talk a little about it. Here's the bullets: . High Performace First Party DMA with programmable data rates of up to 10 MB/sec. . 16 and 8 bit transfers . Even or odd starting address transfers . Maximum sychronous SCSI transfer rate of 5.0MB/sec. . Asychronous and Sychronous peripherals supported simultaneously . Programmable AT bus burst transfer on/off times . Jumper selectable DMA channel for bus arbitration (0,5,6,7) . Jumper selectable interrupt channels (9,10,11,12,14,15) . True multi-threaded operation supporting up to 255 tasks simultaneously . Programmable mailbox architecture . BIOS for AT hard disk emulation. . Jumper selectable I/O port address . Internal and external SCSI connectors That's the bullets. Target retail prices between $300.00 and $350.00. Basically, its the highest performance I/O adapter in its class. At the BIOS level I have measured real data through puts of 2.0MB/sec. As opposed to the 247Kb/sec for ST-506 and 730KB/sec to 1.0MB/sec for ESDI. The beautiful thing about this performance is that it is independent of the CPU. You can have this performance in a 8MHZ 286AT or a 16MHZ 386 box due to the on-board DMA. Roy Neese UUCP @ ihnp4!sys1!cpe!neese