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Post by METAL MAGE on Aug 25, 2004 13:26:33 GMT -5
Using the schematic for the COMPSys MAX232 RS-232 interface, I soldered everything together using a cannabalized 1660 modem case for the user connector, and I plugged it in to a C-64 and my PC.
When I turned on the 64, nothing came up on the screen... but the light said the power was on... When I removed the interface cable... the same thing happened when I turned on the power... nothing!
So, all I managed to do was KILL TWO C-64 PCs, since I tried it over again after the first time on a second 64.
I am going to post what I did and you can tell me what I did wrong...
I soldered the following wires from a serial cable to:
wire/user connector pin/MAX232DB pin
RED /2/+5V BLUE /M/Tx GREEN /B,C/Rx BLACK /A,N/Grd
The diagram shows A and N converging at a point which Grd also connects to... so I soldered the black wire to pin N and then I soldered another black wire to connect pins A and N... I did the same thing for GREEN and pins B,C
Did I read the schematic wrong? I scraped all of the trace connections off with a razor knife...
I guess the only thing that I did right was solder the connections to the DB cable and use a mitre saw to cut a 1660 modem in half to provide a sturdy and short user connector project box...
Dave
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Post by METAL MAGE on Aug 25, 2004 16:23:19 GMT -5
Well... (sheepish grin) I didn't kill them per se, but I did fry the fast blow 1.5A 250V fuses! But, I bought a pack of 4 of 'em from Radio Shack and I am back in business...
However, I do not know why my interface cable I assembled blows the fuses, since I know jack about hardware.
Anyone know what I did wrong? Should I not JUMP a wire from pins A-M and pins B-C and connect all of the wires to a common terminal point from Rx, Grd to those pins as the diagram shows?
Even if I did succeed in building this cable interface, what good is it? It does not support RTS/CTS/DTR, etc, right? Because the other pins are not used... a 3-wire interface as ya'll are referring to it as... right?
Dave
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