Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!caen!hellgate.utah.edu!fcom.cc.utah.edu!cc.usu.edu!sl87m From: sl87m@cc.usu.edu (The Barking Pumpkin Digital Gratification Ensemble) Newsgroups: comp.sys.amiga.advocacy Subject: Re: Amiga Serial Ports Message-ID: <1991Jun10.125013.48056@cc.usu.edu> Date: 10 Jun 91 12:50:13 MDT References: <31@ryptyde.UUCP> Organization: Utah State University Lines: 42 In article , rkushner@sycom.UUCP (Ronald Kushner) writes: > mykes@amiga0.SF-Bay.ORG (Mike Schwartz) writes: >>In article <31@ryptyde.UUCP> dant@ryptyde.UUCP (Daniel Tracy) writes: >>>Responding to the following: >>> >>>"Do builtin Mac SCSI ports go at upwards of 2MB per second? >>> >>>The Amiga's serial port goes 25% faster than the Mac's. Neener neener neener >>> >>>Something like that, yes. Also, a previous post indicated that Amiga serial >>>ports are NOT as fast as the Macs. Would you call 31.5Kbaud 25% faster than >>>57.6Kbaud? I think you had better rethink your math... >> >>I would call 4*57.6K baud faster than 1*57.6K baud. The Amiga serial ports go >>even faster than this, but the quality and length of the serial cables gets to >>be a problem. > > I will have to disagree again, in the real world where people use hard drives > and serial ports at the same time, the 68000 based Amigas can't service the > port fast enough to catch every bit comming in at 19,200..there needs to be > some extra firmware added to allow real hardware handshaking, when the buffer > in PAULA fills, it should have a way to automatically drop RTS... > > Do this: > > Take one Amiga 500 with a GVP Series II 100 meg Quantum, an 8 inch > null modem cable, and an Amiga 2000 with an Hardframe with an identical 100 > meg Quantum. Put 2 floppy drives on both systems, and three hard drive > partitions. NO FAST RAM ON EITHER MACHINE(The A500 can have 512K of slow ram) > Hook them up, and watch what happens when you start transfering files between > the machines at 19200 in a 2 color window. I'd suggest using ZModem, since > Y-Modem-G will bomb out the first time the hard drive write the buffer.... My stock A500 plus a Trumpcard500 w/ 80Mb Seagate drive (lots slower than your Quantum) can transfer data over a 6' cable w/ a i*m peecee at 38kBaud with occational retries using Kermit. I've had no problems with 19kBaud. If I want to play a game while downloading, however, I have to drop to 9600 else Kermit gets too many retries to make the speed efficient. Just an observation, james