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: Parallel transfer from IBM to C64
Message-ID: <708@csd4.milw.wisc.edu>
Date: 1 Feb 89 17:12:51 GMT
References: <1447.23E5B7FA@isishq.FIDONET.ORG>
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Organization: UW-Milwaukee Home for Out-of-date 8 bit Hackers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: 37

In comp.sys.cbm article <1447.23E5B7FA@isishq.FIDONET.ORG>, izot@f171.n221.z1.FIDONET.ORG (Geoffrey Welsh) wrote:
] > Plagiarism? <grin> <grin> <grin>
]   He asked so I gave him the code.

I should hope.  :-)

]   Steve's 9600 bps on PC III/128 is 16% off - and I know why. Apparently the 
				      ^^ 'just a little off'  hehe
]1670 Modem/1200 works fine with the C64's slightly off 1200 bps, but not with 
]a strictly correct 1200 bps! Thus PC II (note: "II", not "III") was designed 
]to provide that error, and it grew at higher baud rates... PC III inherited 
]that timing error (which only got worse on the 1 MHz C64).

Another argument in my battle to ban the 1670.

]   FASTERM was never tested against a high-speed modem, but DesTerm 128 was 
]verified against a USRobotics HST. We found that, because the modem had to 
]auto sync to a wide range of baud rates, it would not accept even slightly off 
]timing. As a result, the code in DesTerm 128 is almost identical to that in 
]FASTERM, but the constants were arrived at by means of an oscilloscope and 
]confirmed by trial on the HST.

Well, I can't do anything fancy to get it to work.... I don't have the
necessary facilities.

]   Thus, you may not be able to use FASTERM with your 2400 MNP modem at 4800 
]bps because its autosync timers are too sensitive for it...

Didn't work too well between two direct connect 64's either, which is
why I STILL suspect clock speed problems.

.									JG
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