RE: [N8VEM: 13914] Re: [N8VEM-S100:875] 1.1k 10-pin Resister Pack supplier (or alternative values)?

["Andrew Lynch" <LYN...@YAHOO.COM>]

Hi Tom!  Thank you very much!  Wow!  That's really helpful!

I've uploaded your spread sheet to the N8VEM S-100 wiki here

http://n8vem-sbc.pbworks.com/w/file/54762647/S100%20Project%20Parts.xls

@All, please update the above spread sheet as you build and test your S-100
boards.

Great contribution Tom!  I very much appreciate it!

Have a great day!

Andrew Lynch

> -----Original Message-----
> From: n8...@googlegroups.com [mailto:n8...@googlegroups.com] On
> Behalf Of Tom Lafleur
> Sent: Thursday, June 21, 2012 10:05 AM
> To: n8vem...@googlegroups.com; n8...@googlegroups.com
> Subject: [N8VEM: 13914] Re: [N8VEM-S100:875] 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-
> s1...@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
> 
> --
> You received this message because you are subscribed to the Google Groups
> "N8VEM" group.
> To post to this group, send email to n8...@googlegroups.com.
> To unsubscribe from this group, send email to
> n8vem+un...@googlegroups.com.
> For more options, visit this group at
> http://groups.google.com/group/n8vem?hl=en.