Re: [N8VEM-S100:658] Re: 6502 board resistor networks

[John Monahan <mon...@vitasoft.org>]

In generally 1k is sufficient for TTL Pullups. The reason for higher values is to save power drain on the v regulator. You can go up to about 4.7k
Pullups to bus lines are another story
Joh

Sent from my iPhone

On Jan 11, 2012, at 7:12 PM, yoda <yo...@r2d2.org> wrote:

> Hi Andrew
> 
> Would it be possible to have some design rules in general.  I have
> seen a lot of these boards use parts that are not easily obtainable
> which suggests these are copies of old boards without thought.  If
> they are supposed to be pull-up resistors then in general I would
> expect 1K or 4.7K be specified as they are pretty standard.  I checked
> Jameco, Digikey and Mouser and they don't have 1.3 K.  I know
> experienced people can interpret schematics but it tends to discourage
> new people into the hobby that don't have that experience.  Also it
> would be nice to do some standardization of buss interface.  I see
> this board uses ls541's where most other boards use ls373's so one has
> to "stock" many more parts to participate.
> 
> Just a thought
> 
> Dave
> 
> On Jan 11, 6:50 pm, "Andrew Lynch" <LYN...@YAHOO.COM> wrote:
>> Hi Kipp!  The 1.3K ohm resistors are all pull up resistors and have a broad
>> tolerance.
>> 
>> Almost certainly the 1.2K ohm resistors will work just fine.
>> 
>> Thanks and have a nice day!
>> 
>> Andrew Lynch
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>>> -----Original Message-----
>>> From: n8vem...@googlegroups.com [mailto:n8vem-
>>> s1...@googlegroups.com] On Behalf Of kyeakel
>>> Sent: Wednesday, January 11, 2012 10:44 AM
>>> To: N8VEM-S100
>>> Subject: [N8VEM-S100:655] 6502 board resistor networks
>> 
>>> I couldn't find 1.3k ohm resistor networks. I have 1.2k networks, any
>> issue
>>> with using them?
>>> Kipp
>