 |
|
|
|
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Mike Raiford wrote:
> Seriously, go down to the local electronics supply store and buy a
> packet of 9-volt battery clips. It makes life much easier!
I've *got* a battery holder. But I still need to connect the terminals
of the battery holder to the beadboard.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Darren New wrote:
> Heck, if you've ever used a SCSI device you know *that* much. :-)
I've used several SCSI devices. Your point?
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
> I've *got* a battery holder. But I still need to connect the terminals of
> the battery holder to the beadboard.
Solder one of your single-core breadboard wires to each wire of the battery
holder.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
scott wrote:
>> I've *got* a battery holder. But I still need to connect the terminals
>> of the battery holder to the beadboard.
>
> Solder one of your single-core breadboard wires to each wire of the
> battery holder.
That's what I did - except, as noted, I went for multistrand wire that I
can actually bend so that I can route it to anywhere on the breadboard.
Indeed, since I went with multistrand, everything has become a lot
easier. (Except stripping the wires. I suck at that!)
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
> Indeed, since I went with multistrand, everything has become a lot
> easier. (Except stripping the wires. I suck at that!)
Get a pair of wire strippers!
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
"Invisible" <voi### [at] dev null> a écrit dans le message de news:
4bfcd758$1@news.povray.org...
> easier. (Except stripping the wires. I suck at that!)
Get a pair of strippers!
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Gilles Tran wrote:
> Get a pair of strippers!
Now that's more like it. ;-)
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
On 5/26/2010 3:58 AM, Invisible wrote:
> Gilles Tran wrote:
>
>> Get a pair of strippers!
>
> Now that's more like it. ;-)
Haha ... Makes it a bit hard to concentrate though.
--
~Mike
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
On 5/25/2010 11:52 AM, Darren New wrote:
> Mike Raiford wrote:
>> f I had read a tutorial on working with logic gates,
>
> Heck, if you've ever used a SCSI device you know *that* much. :-)
>
Wait ... I thought those were terminating resistors? Entirely different
function.
--
~Mike
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Mike Raiford wrote:
> Wait ... I thought those were terminating resistors? Entirely different
> function.
They're not pull-down resistors at the end of the chain?
--
Darren New, San Diego CA, USA (PST)
Ada - the programming language trying to avoid
you literally shooting yourself in the foot.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
On 5/26/2010 10:43 AM, Darren New wrote:
>
> They're not pull-down resistors at the end of the chain?
>
Just did a quick read on SCSI termination. Yes, they are pull down
resistors!
--
~Mike
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Mike Raiford wrote:
> On 5/26/2010 10:43 AM, Darren New wrote:
>
>>
>> They're not pull-down resistors at the end of the chain?
>>
>
> Just did a quick read on SCSI termination. Yes, they are pull down
> resistors!
I never looked it up specifically, but it's pretty obvious from looking at
the SCSI protocol specs that the addressing and bus mastering and such works
by pulling down zeros and letting ones float. Hence the "SCSI Priority"
being the LUN and having "0" always be the host. It's a pretty common way
of working a shared bus, from ISDN to those one-wire protocol capsules.
--
Darren New, San Diego CA, USA (PST)
Ada - the programming language trying to avoid
you literally shooting yourself in the foot.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
On 5/26/2010 5:16 PM, Darren New wrote:
> I never looked it up specifically, but it's pretty obvious from looking
> at the SCSI protocol specs that the addressing and bus mastering and
> such works by pulling down zeros and letting ones float. Hence the "SCSI
> Priority" being the LUN and having "0" always be the host. It's a pretty
> common way of working a shared bus, from ISDN to those one-wire protocol
> capsules.
Yep... Except often times when I think terminating resistor, I'm
thinking a resistor connected at the ends of the line to damp reflected
signals.
--
~Mike
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Mike Raiford wrote:
> Yep... Except often times when I think terminating resistor, I'm
> thinking a resistor connected at the ends of the line to damp reflected
> signals.
Given that SCSI allows cables up to 50' or something, I suspect they serve
both purposes.
--
Darren New, San Diego CA, USA (PST)
Ada - the programming language trying to avoid
you literally shooting yourself in the foot.
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Well let me see now... I bought a couple of switches and resistors, and
spent the morning soldering them together. I now have two switches - a
rocker switch and a push switch. In one position, you get logic 0, in
the other position, you get logic 1, and no floating inputs. Yay, me!
It's kind of frustrating how many problems I'm having with this whole
exercise - and most of them aren't electrical. They're mundane physical
issues. (E.g., one of the switches I bought has metal terminals with
small holes to poke the wires through. Except they're too tiny to poke
any wire through!)
Still, it was gratifying to flick some switches and watch an LED light,
correctly implementing the truth table of a NAND gate.
I was about to try rigging up a simple binary half adder - and then I
realised that this requires 7 NAND gates, and I obviously only have 4. >_<
I've bought a small plastic box, and I'm hoping to somehow mount some
switches on it, common-up the power rails, and end up with a box which I
can just connect to the power and have a nice set of output wires. But
this requires drilling and soldering and all sorts.
It's times like this where I miss my old electronics kit. :-( Everything
seemed so much easier back then...
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
