[torontocbm] uIEC/SD comments
- From: Jim Brain <brain@xxxxxxxxxx>
- To: torontocbm@xxxxxxxxxxxxx
- Date: Sat, 13 Dec 2008 20:24:51 -0600
I thought I'd help out with some questions here:
* Cat5 cable is fine.
* copper is preferred, but I wouldn;t drive across town for it. The
oxidation aspect (which is why Cu and Al are not mixed in power
line applications) is not a major factor in this case
* Shielded is always preferred.
* Buy Rosin core solder. Make sure you do not get "acid" core (Yes,
rosin is an acid, but acid core is much more acidic)
* If you solder to the 1x13 black connector, any of the usual
soldering pencils are fine. As Tom notes, less exposure is best.
25W to 35W seems to be the norm here. I would encourage you to
solder to that connector rather than remove the right angle header
(at least until your unit gets programmed with the bootloader.
After that, anything goes)
* You should not need flux for just wire soldering. The trick is to
strip the wire a bit, twist the exposed wire (if stranded), hold
the iron to the exposed wire, and then touch the solder to the
wire (not the iron). Let the solder melt a bit on the wire (the
flux is in the middle of the solder, so it needs a bit of time to
get to the wire to clean it) and then pull the solder and iron.
Then, insert the nicely "tinned" wire into the hole or on the
connector and tap it with the soldering iron
* I'm always interested in what does not work.
* To that end, I'm at brain@xxxxxxxxxx, and the uIEC mailing list is
at www.jimbrain.com/projects/uIEC/subscribe.html
* I would not remove the IEC connector from the 64 unless you need
that hole for a mod. You can safely solder the wires to the back
of the connector, or on the bottom of the motherboard.
* I would not try connecting the uIEC to the serial port without
power. Without proper power, the unit essentially backfeeds and
pulls power from ATN, SRQ, DATA, CLK, and RESET through the pullup
resistors on the VIC/64/128. But, the power is very unstable, not
sent to the VCC of the uC, and is not 5V. That is why many
devices appears to partially work with no power connected. If the
goal is to enable/disable, You could install a single switch on
the ATN line into the uIEC to "mute" it. But, if you bring out
the "FWD/BACK" buttons from the connector (pin 8 and 9), you can
press them at the same time to silence the device (press and hold,
as I recall)
I encourage folks to ask these questions on the uIEC list as well.
Jim
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