tdwest@orchid.waterloo.edu (Terry D. West) (03/02/88)
In article <43597@sun.uucp> cmcmanis@sun.UUCP (Chuck McManis) writes: > And in truth the limiting factor becomes >the SCSI interface, which in its Asynchronous mode is limited to 1.25 >Megabytes per second. ^^^^^^^^^^^^^^^^^ I posted an article requesting info about the 2090, but nobody replied :-( Is it kosher to send mail to CATS people? I assume the 2090 cannot do Synchronous SCSI, but it would not be difficult at ALL to build a 5 MBYTE/s (yes 5x10^6 8 bit chunks/second) synchronous SCSI host adapter for the amiga (I could do it in a weekend). Undoubtably, there are SCSI drives out there that can do synch (Adaptec's higher priced controllers can)... So can FFS handle a 5 Megabyte transfer rate? BTW, when are we actually going to get FFS??? (other than, as is usual, 3 weeks before the folks in the US do :-) Terry D. West 4B Computer Science/ Elec Eng watmath!orchid!tdwest
root@sbcs.sunysb.edu (SBCS Systems Staff) (03/03/88)
In article <12330@orchid.waterloo.edu>, tdwest@orchid.waterloo.edu (Terry D. West) writes: > I assume the 2090 cannot do Synchronous SCSI, but it would not be > difficult at ALL to build a 5 MBYTE/s (yes 5x10^6 8 bit chunks/second) > synchronous SCSI host adapter for the amiga (I could do it in a weekend). Terry, no problem building a 5 mByte/sec drive -> interface controller, but you won't get more than 14.318Mhz/(2*4) words (= 3.579 mBytes/sec) per second out of the Amiga bus. This arises from the fact that you have to look like a 7.159 mHz 68000 when driving the Amiga bus, ie each word transferred takes 4 ticks of the cpu clock. Of course, you could put a load of shared memory on the controller card and do your DMA to that memory, but that's another controversy :-) > Undoubtably, there are SCSI drives out there that can do synch > (Adaptec's higher priced controllers can)... I suspect that the only spindle you'll get more than ~3mByte/sec out of are the (still expensive) PTD drives that Fujitsu, etc make. To the best of my knowledge, no one makes a PTD -> SCSI controller. > Terry D. West > 4B Computer Science/ Elec Eng > watmath!orchid!tdwest Rick Spanbauer SUNY/Stony Brook
bill@cbmvax.UUCP (Bill Koester CATS) (03/03/88)
In article <12330@orchid.waterloo.edu> tdwest@orchid.waterloo.edu (Terry D. West) writes: > >I posted an article requesting info about the 2090, but nobody replied :-( You can get the A500/A2000 Technical reference manual by sending $40 US to: Commodore Business Machines Attn: Lauren Brown 1200 Wilson Drive West Chester, PA 19380 >Is it kosher to send mail to CATS people? > I guess it wouldn't hurt to try. -- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Bill Koester (CATS) >>Commodore Amiga Technical Support<< Commodore International Ltd. UUCP {allegra|burdvax|rutgers|ihnp4}!cbmvax!bill PHONE (215) 431-9355 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Pleese desrigard eny spealing airors!!!!!!! =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=