Re: Where to start on Missile Command PCB repair

For a game as old as this it won't matter.
On Nov 1, 2013 9:19 AM, "Grant Thienemann" <grant.thienemann@gmail.com>
wrote:

> Hey Rodger,
>
> That's not a problem though right? Also how accurate does the delay have
> to be?
>
> Thanks
> Grant
>
>
> On Fri, Nov 1, 2013 at 10:13 AM, Rodger Boots <rlboots2@gmail.com> wrote:
>
>> Draws less current.
>> On Nov 1, 2013 8:33 AM, "Grant Thienemann" <grant.thienemann@gmail.com>
>> wrote:
>>
>>> Ok just one more quick clarification, when you are looking at a 74LS
>>> series chip, they are both 10ns delays, the chips takes considerable less
>>> power to operate, its not that it can't handle the voltage coming to the IC
>>> itself right?
>>>
>>>
>>> On Fri, Nov 1, 2013 at 9:31 AM, Kevin Moore <talon.k@gmail.com> wrote:
>>>
>>>> I find Digikey tends to run a little higher on some things. I like
>>>> Newark, Jameco, and occasionally Mouser.
>>>>
>>>> Also you can use Findchips.com they exclude Jameco but it will give you
>>>> a good idea on pricing.
>>>>
>>>>
>>>>
>>>>
>>>> On Fri, Nov 1, 2013 at 8:27 AM, Grant Thienemann <
>>>> grant.thienemann@gmail.com> wrote:
>>>>
>>>>> Hey Kevin,
>>>>>
>>>>> Thank you for the information! I've never used Jameco before, I've
>>>>> always used digikey.
>>>>>
>>>>> -Grant
>>>>>
>>>>>
>>>>> On Fri, Nov 1, 2013 at 9:26 AM, Kevin Moore <talon.k@gmail.com> wrote:
>>>>>
>>>>>> 74S00
>>>>>>
>>>>>> http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_676959_-1
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Fri, Nov 1, 2013 at 8:24 AM, Grant Thienemann <
>>>>>> grant.thienemann@gmail.com> wrote:
>>>>>>
>>>>>>> Ok lets say you have a 74S00, which is for speed, can you replace
>>>>>>> that with a 74F00?
>>>>>>>
>>>>>>>
>>>>>>> On Fri, Nov 1, 2013 at 9:17 AM, Grant Thienemann <
>>>>>>> grant.thienemann@gmail.com> wrote:
>>>>>>>
>>>>>>>> Hey Rodger,
>>>>>>>>
>>>>>>>> Thank you for the information. I'm looking at wikipedia now about
>>>>>>>> the 74XX series chips, which would be the default standard when looking to
>>>>>>>> replace a 7400, or 7404 etc, would that be HTC?
>>>>>>>>
>>>>>>>> Thanks
>>>>>>>> Grant
>>>>>>>>
>>>>>>>>
>>>>>>>> On Fri, Nov 1, 2013 at 9:08 AM, Rodger Boots <rlboots2@gmail.com>wrote:
>>>>>>>>
>>>>>>>>> Close. HCT is closer. Either should work.
>>>>>>>>> On Nov 1, 2013 7:52 AM, "Grant Thienemann" <
>>>>>>>>> grant.thienemann@gmail.com> wrote:
>>>>>>>>>
>>>>>>>>>> Ok not to keep getting off topic, but as this is related to the
>>>>>>>>>> Missile Command repair, I'm going to ask. When I look for 74191 I can't
>>>>>>>>>> find anything on Digikey, etc, but when I search for 74HC191 it comes up,
>>>>>>>>>> is that the same thing?
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On Fri, Nov 1, 2013 at 8:42 AM, <solarfox@triluminary.net> wrote:
>>>>>>>>>>
>>>>>>>>>>> On Fri, 1 Nov 2013 00:35:07 -0400, you wrote:
>>>>>>>>>>>
>>>>>>>>>>> >So I can generally replace a 7404 with a 74LS04 without any
>>>>>>>>>>> problems?
>>>>>>>>>>>
>>>>>>>>>>> *Normally*, yes, but there *are* cases where you can run into
>>>>>>>>>>> problems. The
>>>>>>>>>>> switching speed of 74LS-series parts isn't *quite* identical to
>>>>>>>>>>> standard
>>>>>>>>>>> 7400-series; the propagation delays of a 7404 vs. a 74LS04, for
>>>>>>>>>>> example:
>>>>>>>>>>>
>>>>>>>>>>> -------- 7404 -------- ------- 74LS04 -------
>>>>>>>>>>> tPLH 12ns (typ) 22ns (max) 9ns (typ) 15ns
>>>>>>>>>>> (max)
>>>>>>>>>>> tPHL 8ns (typ) 15ns (max) 10ns (typ) 15ns
>>>>>>>>>>> (max)
>>>>>>>>>>>
>>>>>>>>>>> (Source: a very dog-eared and well-used copy of "The TTL Data
>>>>>>>>>>> Book, vol.2",
>>>>>>>>>>> Texas Instruments, 1985)
>>>>>>>>>>>
>>>>>>>>>>> The difference is, admittedly, pretty small, but it can add up
>>>>>>>>>>> when you've
>>>>>>>>>>> got signals flowing through a bunch of different gates, or when
>>>>>>>>>>> you've got
>>>>>>>>>>> a more complex chip (such as the 74191). So, depending on the
>>>>>>>>>>> circuit in
>>>>>>>>>>> question, there's a small (but non-zero) chance that you *could*
>>>>>>>>>>> end up
>>>>>>>>>>> with a "race" condition by swapping a 74LS part into a circuit
>>>>>>>>>>> full of
>>>>>>>>>>> 7400-series chips.
>>>>>>>>>>>
>>>>>>>>>>> --------------------------------------------------------------------------
>>>>>>>>>>> "I thought I told you to look after him!"
>>>>>>>>>>>
>>>>>>>>>>> "He'll be all right; he's a Time Lord."
>>>>>>>>>>>
>>>>>>>>>>> "That's just what they're _called_; it doesn't mean he actually
>>>>>>>>>>> knows what
>>>>>>>>>>> he's _doing!_"
>>>>>>>>>>>
>>>>>>>>>>> --------------------------------------------------------------------------
>>>>>>>>>>> solarfox@triluminary.net (Gary
>>>>>>>>>>> Akins jr.)
>>>>>>>>>>>
>>>>>>>>>>> --------------------------------------------------------------------------
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> ---------------------------------------------------------------------------
>>>>>>>>>>> ** Unsubscribe, subscribe, or view the archives at
>>>>>>>>>>> http://www.vectorlist.org
>>>>>>>>>>> ** Please direct other questions, comments, or problems to
>>>>>>>>>>> chris@westnet.com
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>

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Received on Fri Nov 1 12:49:28 2013