Re: Where to start on Missile Command PCB repair

Hey Guys,

Thank you so much! That is what I needed to know! It seems there are way
more parameters that I need to take into account for these than I
originally thought. I was just trying to save some money buy going to a
newer fast and cheaper chip, but it appears for now just for a Missile
Command at least, it won't be a problem, but it won't be the case all the
time.

Thank you so much Rodger, Mendel and Brad!
-Grant

On Fri, Nov 1, 2013 at 12:19 PM, Rodger Boots <rlboots2@gmail.com> wrote:

> 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 13:11:19 2013