To: Jim McMannis who wrote (62623 ) 8/17/1998 11:08:00 PM From: d[-_-]b Read Replies (1) | Respond to of 186894
Jim, FYI SCSI transmits data at 10, 20 or 40 Mb/sec depending on whether it's SCSI 1 or 2 and whether it's narrow, wide or ultra wide. USB transmits at 1.5/12, so it could do as well as older SCSI technology but even IDE does 33 Mb now days, so it's just too slow for serious storage devices. The benefit of USB is the simple no IRQ connector for your digital camera and scanner or printer, keyboard, mouse, joystick, speakers, etc., etc. To most computer users it's as simple as a phone jack, just plug it in with a single cable and connector type, the part that makes me mad is "why the h*ll wasn't this done years ago?" I have a collection of heavy 25 pin serial and parallel cables, gender benders and break out boxes I'd just love to throw in the trash. No matter what you're doing with RS232 it's always the wrong gender, or pinout (straight through when you wanted null modem). Not to mention all those goofy ac to dc power blocks hanging all over the place with accompaning power strips - looks like Dr. Frankensteins lab or a fire hazard at best. Glad to help, cheers Eric. PS: There are serial to USB converters so all those devices you can't connect to your PC, because you're out of IRQ's you can now use under USB, since Microsoft emulates IRQ's or maps them into USB space for you. I currently have 4 serial ports all on different IRQ's but have 6 serial devices, so I have another low tech solution using a switch box - I'd loved to throw that in the trash as well. Some OS's like UNIX (Solaris on x86) don't allow IRQ sharing so IRQ 7 can't be shared between your printer LPT1 and your Sound Blaster card like they can under Windows/DOS. Under DOS the drivers usually can't see above IRQ 9 - anyway I think this rant gives you an idea of the sick architecture IRQ's have presented for millions of peripheral collecting users such as myself.