> ] :A long cable is used for sending (MSX pin 6,7,3) and has a male DIN5 plug.
> ] :A short cable is used for receiving (MSX pin 1,2,8) and has a female DIN5
> ] :plug.
> ]
> ] Ah, didn't add that (about the long and the short cable) yet on my page.
I don't understand why the cable-sizes are different, for sending or receiving!
Isn't it all in the same cable?
> ] :> The maximum transfer speed is theoretically only limited by the MS
X
> ] :>clock but the cable impedance (lenght and the existence or not of
> ] >shielding)
> ] :>may decrease the rate.
> ] :
> ] :So the standard should also include "you must use shielding" and "maximum
> ] :cable length is xx meters"?
> ]
> ] No man, that has no use. A cable without shielding can do as fine as a
> ] shielded cable, the only thing is that **theoretically**, the dropout-rate
> ] can be a little higher.
> Too bad that things which can happen theoretically also will happen
> practically. When the transfer speeds are high enough. So I do not think it
> will be such a big issue with our Z80's at 3.58MHz. But then again, if
> somebody wants to make a really long cable it could become a problem.
>
> Anybody around here that knows more about physical limitiations, possible
> radio interference problems (caused by higher harmonics generated by the
> square wave) and other kind of to be expected problems?
Shielding seems very useful (and is very easy to make in this case), since
indeed there is much less interference, and at higher rates, the cable can
act as "transmission line" if it's shielden (like COAX cables). In this way
higher frequencies can be transmitted. I hope it's true what I'm saying here.
Anyway, USE SHIELDING! Won't cost extra, is much safer.
The length of the cable will not have much limitations, except for the
resistance of it: make sure it's not to high, to prevent loss of data.
So don't make the cable too long. I'm not an expert in this too, but I
know something of it.... (at least, I should, I'm a 4th year physics-student
now...)
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