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RE: [N8VEM-S100:560] Best place to start building S100 computer?
Neat idea!
John
John Monahan Ph.D
mon...@vitasoft.org
-----Original Message-----
From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On
Behalf Of Jack Rubin
Sent: Wednesday, December 21, 2011 10:23 AM
To: n8vem...@googlegroups.com
Subject: Re: [N8VEM-S100:560] Best place to start building S100 computer?
That's why I've been doubling up on many of the N8VEM boards - one to build
with regulators for vintage systems and one to build without regulators for
a modern "reference system" for software testing and reliability. :>)
Jack
----- Original Message ----
> From: John Monahan <mon...@vitasoft.org>
> To: n8vem...@googlegroups.com
> Sent: Wed, December 21, 2011 12:11:45 PM
> Subject: RE: [N8VEM-S100:559] Best place to start building S100 computer?
>
> The only problem with that Jack is you have to remove/bypass
> regulators on every board. A real pain if you are switching old/new
> S-100 boards in out and essentially out of the question if you have
> as well an old IMSAI like box. If you are doing this, watch out for
Zenier diodes on some boards.
> Honestly the modern switching supplies are easier and don't provide
> any home heating!
> John
>
>
> John Monahan Ph.D
> mon...@vitasoft.org
>
> -----Original Message-----
> From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com]
> On Behalf Of Jack Rubin
> Sent: Wednesday, December 21, 2011 4:51 AM
> To: n8vem...@googlegroups.com
> Subject: RE: [N8VEM-S100:558] Best place to start building S100 computer?
>
> Why fight to drive uphill to just heat the room? Just eliminate the
> 78xx regulators and run 5 and 12 volts on the rails! That's what
> Godbout and Morrow did at the end - it's certified vintage and it's
smart.
>
> Jack
>
> > -----Original Message-----
> > From: n8vem...@googlegroups.com
> > [mailto:n8vem...@googlegroups.com]
> > On Behalf Of Mike
> > Sent: Wednesday, December 21, 2011 12:11 AM
> > To: n8vem...@googlegroups.com
> > Subject: Re: [N8VEM-S100:557] Best place to start building S100
> > computer?
> >
> > On 12/20/2011 02:49 PM, W3DRK wrote:
> > [clip]
> > >
> > > I'd like to start by collecting the basic "core" parts such as a
> > power
> > > supply and motherboard and build up from there.
> > >
> > > Fortunatly I am friends with someone in the custom transformer
> > > field so getting a decent transformed sized just for this purpose
> > > should be pretty strait forward, and perhaps even less expensive
> > > then using
> > > 2
> > or
> > > 3 seperate SMPS units. I already have heavy heatsink mounted
> > > rectifier diodes, filter caps, etc so that helps too.
> > >
> > [clip]
> > > Thanks!
> > > Dieter Kedrowitsch - W3DRK
> >
> > Hi Dieter,
> >
> > I'd agree with the others regarding the use of a switching power
> > supply.
> > I got a 7.5V @42A supply from eBay that has a little bit of voltage
> > adjustment, but I'm leaving it at 7.5V so the 7805s will run a
> > little cooler.
> >
> > I also got, from eBay, a couple of 12V @5A switchers to run the
> > +/- 16V rails, they will adjust to about 14.5V which will be fine.
> >
> > All together I don't think I spent more than about $80 on the power
> > supplies.
> >
> > PS. Sorry I've been slacking on the 68K work, guys, I've been just
> > up to my neck, it's getting closer to the front burner however.
> >
> > Mike Sharkey
> > http://8bit.zapto.org
> > -----
> > No virus found in this message.
> > Checked by AVG - www.avg.com
> > Version: 2012.0.1890 / Virus Database: 2109/4693 - Release Date:
> > 12/20/11
>
>
>