Re: [N8VEM-S100:877] 1.1k 10-pin Resister Pack supplier (or alternative values)?

[Tom Lafleur <laf...@lafleur.us>]

thanks...

I have a large inventory of LS and ALS parts, so I almost always use them...




On Thu, Jun 21, 2012 at 9:51 AM, John Monahan <mon...@vitasoft.org> wrote:
> Thanks Tom. I added the spread sheet to the S100Computers web site at:-
> http://s100computers.com/My%20System%20Index%20Page.htm (bottom of page).
>
> John
> PS. Many of the less common OC 74LSxx chips can be substituted with the 74xx
> (e.g. 7401's)
>
> From:  John Monahan Ph.D
> e-mail: mon...@vitasoft.org
> Text:    mon...@txt.att.net
>
>
> -----Original Message-----
> From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On
> Behalf Of Tom Lafleur
> Sent: Thursday, June 21, 2012 7:05 AM
> To: n8vem...@googlegroups.com; n8...@googlegroups.com
> Subject: Re: [N8VEM-S100:876] 1.1k 10-pin Resister Pack supplier (or
> alternative values)?
>
> Here is an Excel spread sheet that list most of the parts needed for the
> S100 boards in a Z80 system with cost for each part.
> its not 100% correct, but pretty close... very easy to add more boards if
> needed!
>
> For parts I did not have, I use Avnet Express where I could, very good
> pricing on most items!!! Reasonable shipping and quick...
> Much better pricing that Mouser, Digikey and most of the "surplus"
> stores... and the parts are NEW.
>
> enjoy...
>
> tom...
>
>
> On Thu, Jun 21, 2012 at 6:29 AM, John Monahan <mon...@vitasoft.org> wrote:
>> Just use 1K
>>
>>
>> From:  John Monahan Ph.D
>> e-mail: mon...@vitasoft.org
>> Text:    mon...@txt.att.net
>>
>>
>> -----Original Message-----
>> From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com]
>> On Behalf Of Paul Birkel
>> Sent: Wednesday, June 20, 2012 10:37 PM
>> To: n8vem...@googlegroups.com
>> Subject: Re: [N8VEM-S100:874] 1.1k 10-pin Resister Pack supplier (or
>> alternative values)?
>>
>> Thanks Tom, John.  Doing the verification part here before the testing
> :->.
>> We need to collect these sorts of "tweaks that work" for the various
>> boards in appropriate locations methinks.
>>
>> John:  While I've been reading up on the various calculations
>> regarding the selection of o.c. pullups and fanout/in calculations
>> (Wilcox Section 3.1.1 is quite good) I haven't found anything specific
>> on the selection of open-input pullups.  Recommendations?
>>
>> On Wed, Jun 20, 2012 at 11:38 PM, John Monahan <mon...@vitasoft.org>
> wrote:
>>> Paul this question has come up before.  There is nothing special
>>> about the 1.1K value of the pull-up resistors for the TTL circuits.
>>> 1K will be fine, as would the more common 1.2K types.  Jameco used to
>>> sell 1.1K's but no longer do.   The choice of value for pull-ups like
>>> that is a balance between noise immunity (low values, ~1K) to power
>>> utilization (high values ~2K or even 4.7K).   Other factors are
>>> signal
>> pulse width and fan-out.
>>>
>>> John
>>>
>>>
>>>
>>> From:  John Monahan Ph.D
>>> e-mail: mon...@vitasoft.org
>>> Text:    mon...@txt.att.net
>>>
>>>
>>> -----Original Message-----
>>> From: n8vem...@googlegroups.com
>>> [mailto:n8vem...@googlegroups.com]
>>> On Behalf Of Paul Birkel
>>> Sent: Tuesday, June 19, 2012 10:32 PM
>>> To: n8vem...@googlegroups.com
>>> Subject: [N8VEM-S100:870] 1.1k 10-pin Resister Pack supplier (or
>>> alternative values)?
>>>
>>> The S-100 MSDOS Board, Z80A Master CPU Board, and Serial I/O Board
>>> all specify the use of a 1.1k 10-pin Resister Pack.
>>>
>>> This seems to be an uncommon part.  Is there a recommended supplier?
>>>
>>> Alternatively, is the value critical in these three board-uses?
>>>
>>> The S-100 MS-DOS Board uses a pair of packs (RR7/8) as input pull-up
>>> resistors on the two 74LS165 address decoders. The Z80A Master CPU
>>> Board similarly uses three packs (RR3/4/7) as input pull-up resistors
>>> on its three
>>> 74LS165 address decoders.  It seems to me that in this use the values
>>> are fairly non-critical.  What is the recommended,
>>> commonly-available, alternative resistor value?
>>>
>>> The Serial I/O Board is a bit more complicated.  It uses a single
>>> pack
>>> (RR1) which connects to PU1K-A thru PU1K-I.
>>>
>>>    1. PU1K-A/B/C are used on the Z8530 UART_INT*, UART_IEI, and
>>> UART_INTA, apparently as input pull-ups.
>>>    2. PU1K-E/F are used as pull-ups on two outputs of a
>>> open-collector 74LS06N (the other 4 outputs are spares).
>>>    3. The remaining 4 pack-resistors are spared.
>>>
>>> Given this mixed-use, what would be the recommended,
>>> commonly-available, alternative resistor value?  Or should I consider
>>> hand-wiring single resistors in each case -- and then what would be
>>> the recommended values in each case (UART input pullups; o.c.
>>> pullups)?
>>>
>>> Thanks!
>>>
>>> paul
>>>
>>
>
>
>
> --
> ~~ _/) ~~~~ _/) ~~~~ _/) ~~~~ _/) ~~
>
> Tom Lafleur
> (858) 759-9692
>



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Tom Lafleur
(858) 759-9692