Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!jgreco
From: jgreco@csd4.milw.wisc.edu (Joe Greco)
Newsgroups: comp.sys.cbm
Subject: Re: Simultaneous disk & RS-232 access
Message-ID: <765@csd4.milw.wisc.edu>
Date: 3 Feb 89 20:38:20 GMT
References: <738@csd4.milw.wisc.edu> <7023@killer.DALLAS.TX.US>
Sender: news@csd4.milw.wisc.edu
Reply-To: jgreco@csd4.milw.wisc.edu (Joe Greco)
Organization: UW-Milwaukee Home for Out-of-date 8 bit Hackers
Lines: 36

In comp.sys.cbm article <7023@killer.DALLAS.TX.US>, elg@killer.DALLAS.TX.US (Eric Green) wrote:
]> I don't know where you pull these figures from.... my clocking of
]> serial has always been somewhat higher (perhaps 500cps).  However,
]> that does not account for the 1541's slow write time....
]I informally clocked it at around 360-380cps, doing a "load" using
]normal Kernel routines (which is just calling the normal serial
]get-a-char routine). 

That still requires that the drive catch up with the serial bus.
That's like telling me how fast a sports car can go by driving it
behind a bus.... you are limited by the speed of the bus (1541).

]Another solution to the disk drive speed problem would be to use a 128
]with a 1581 ;-). If you're really wanting to use your 64 to do it,
]there should be products out there that add fast serial to your 64.

But it shouldn't have to require such a product!  Or a 128/1581.
That's a nonsolution.

]> The only thing I don't like is device specific programming.  I use CBM
]> 8050 drives nearly exclusively, with a BusCard II, and nasty tricks
]> like fast disk I/O won't work.  Somebody who wrote Z-Modem using a
]> fast disk I/O would earn my eternal hate... hehehe
]> 
]> You might also run into some flames from the 1581 folks.
]
]He won't run into flames from the 1581 folks, because his product
]already supports the '81 ;-). I just wish that "burst mode" wouldn't

If he's on the 128, yes.  If he's using device-specific programming on
the 64 designed for the 1541, no.
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