From: Groepaz (groepaz_at_gmx.net)
Date: 2004-01-15 13:05:56
On Thursday 15 January 2004 11:27, Spiro Trikaliotis wrote: > > mmmh... are there really still these cheap 3wire thingies sold? i would > > assume them having atleast rts/cts aswell, maybe also dcd/dtd. > > Yes, they are. Sometimes, the handshake wires are connected locally on > each side. kindof brave to call it nullmodem cable then though :) dcd/dtd is correct to be bridged, but a missing rts/cts connection is pretty much ridiculous - this wont ever work right except when both end are faster than the actual transfer is. (which is true for connecting two modern pc's i guess, but you'll run into all kinds of problems with anything else, not even starting with a c64 :)) > If you connect both C64 into different outlets, connected to different > phases, then I won't be sure that there will be no damage. not a real problem since the voltage is stabilized in the PSU... it is a (BIG!) problem on the other hand with the 9V AC :) (connect them at wrong phase and *boom* :=P) > In a company I once worked, I remember people talking about something like > this, resulting in a cross current of some Ampere in an installation. This > was not very good. ;-) no several ampere on the 5v line of a c64 would definetly not be very good :=D however this problem can be eliminated by throwing in some diodes - and in this case i am not even sure if the powersupplies themselves, or the c64 board wouldnt silently supply these :) > I'm not an electronics engineer, but from my understanding, this is even > more critical if you have PE and N connected in your house installation, > which is the case in many old houses. uhmz well... THAT doesnt make a big difference at all :O) PE and N is connected anyway, doesnt matter where (in your house or in the powerplant). its just no more done in new installations because of other security measures. if the metal case of a certain item is grounded chances are that on a physical failure of some kind -broken PEN line for example- the metal case will have high voltage potential -due to contact with L- but the fuse wont blow if the thing is standing on good isolated ground. "nice" surprise whenever someone touches the thingy :o) with a seperate PE line this is much less likely to happen. infact the seperated PE and N cables yield to another (not existant with the old installations) problem - voltage difference between PE and N - but thats less worse than the above problem :) gpz Message was sent through the cbm-hackers mailing list
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