C64Power Forum
Hardware => Hardware => Wątek zaczęty przez: bloodmoon w 16 Stycznia 2007, 20:24
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Poszukuje schematu montażowego do resetu stacji dysków i commodore
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INSTALLING A RESET SWITCH ON YOUR C-64 (and C64C) 05-22-99
You don`t really need a schematic... I can talk you through it.
You need a momentary contact pushbutton switch (available from Radio
Shack), a few lengths of wire and some hand tools including a drill and
soldering iron. The switch momentarily grounds the input to a chip (pin
8 of U20, a 556 timer IC in the C64) which is used to generate a single
reset pulse each time the computer is turned on.
Connect one side of the switch to the junction of capacitor C105
(a 0.1uF disk ceramic), resistor R50 (a 1 meg 1/2 watt), and pin 8 of
the IC. NOTE: C105 is C34 in some versions of the 64. It`s easiest to
tack-solder onto the resistor leg nearest the capacitor on the top of
the PC board. You don`t have to pull the board out of the case. The
other side of the switch goes to the nearest ground foil, found at the
edge of the PC board near the resistor. By the way, don`t mess up and
connect to the far side of the resistor... that goes directly to the +5
volt supply! Grounding that line will kill chips! Want to make the
modification fail-safe? Add a 100 ohm 1/4 or 1/2 watt resistor in line
(in series) with the switch. Then if you make a mistake, it will do no
harm... it just will not work.
With the proper lengths of wire, you can mount the push button
anywhere it will fit on the case. I like to install it on the lower
left side near where the wires connect to the PC board. If mounted to
the lower cabinet half-shell, the wires will not be disturbed when the
keyboard (top half shell) is removed/installed. Drill the appropriate
sized hole for the push button and mount it so that it doesn`t touch
the PC board and cause a short. Solder the wires and you`re done.
Solder quickly, by the way... those little switches are plastic and
melt from too much heat.
A RESET SWITCH FOR THE C64C
You must remove the metal shield (heatsink) from the top of the
board to
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A RESET SWITCH FOR THE C64C
You must remove the metal shield (heatsink) from the top of the
board to get to the junction of capacitor C43, the anode of diode CR5,
and pin 5 of IC U23. Tack solder one wire of your added pushbutton to
pin 5 of the chip... it`s the only available connection site without
removing the PC board. The other side of the added switch is connected
to ground. Again, for safety`s sake, it`s advisable to install a 100
ohm 1/4 or 1/2 watt resistor in series (in-line with one wire) with the
push button switch.
Mounting the switch in a C is a bit tricky. You must prevent the
switch terminals touching the shield when it is reinstalled. Bend the
shield or cut a small portion of it away if necessary to avoid a short
circuit. When reinstalling the shield, make sure the little fingers
touch all the chips. It is a heat sink and helps to lengthen the life
of those precious ICs. If necessary, bend down all the tabs slightly
before installing the shield.
Ray Carlsen
CARLSEN ELECTRONICS... A leader in trailing-edge technology.
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Wszystko pięknie ładnie ale czy masz do tego schemat tzn. zdjęcie jak to zrobić...niby wiem o co tam chodzi ale nie chciałbym się mylnąć i czegoś spalić w moim komciu
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http://home.ica.net/~leifb/commodore/64reset/index.htm
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Ostatnie już pytanie czy masę to można podłączyć do tego punktu który pokazywał mi Pan na wcześniejszym schemacie odnośnie napięcia 12 V
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http://www.forum64.de/wbb2/thread.php?postid=129286&sid=c900e820d275cdbb5825deadf9d3aa28#post129286
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Nieeeeeeeeee ten schemat sorry za pomyłkę
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Miałby Pan jeszcze gdzieś Pod ręką schemat resetu do stacji...
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Na złączu serial występuje sygnał reset. Wystarczy zewrzeć go z masą.
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Fajnie wiedzieć ale który Pin to reset bo masa to chyba 2
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Dobra nieważne już sam znalazłem
http://www.hardwarebook.info/Commodore_Serial_I/O#RESET
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W modelu 1541 II na płytce są zaznaczone numery gniazda ułatwia to sprawę. Łatwo więc zrobić reset łącząc pin 6 z 2.
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Niestety posiadam 1541-I ale i tak dam sobie rade...
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W 1541 jak rozkręcisz to także będą opisane wtyki - właśnie sprawdziłem