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RE: [N8VEM-S100:49] Re: Z80 and SIO board running

Hi Ken!  Thanks!  You may want to consider using the N8VEM SBC ROM image (23 May 2008) as a basis for porting CP/M to your board.  Since the S-100 Z80 CPU allows a boot ROM you can assemble your own ROM bootable CP/M image.  All you have to do is update the CBIOS source code to reflect your own IO configuration.  The CBIOS assumes a standard 16C550 UART for console IO and uses RAM/ROM drives for block IO.  Those routines could be easily substituted with your own routines for your specific hardware.  Then you would have a “bare bones” CP/M 2.2 image booting you could use to bring in other more sophisticated CP/M images.


This is just my “two cents” idea that may make it a bit easier for you.  Please post any photos, code, and status as you progress.  Thanks and have a nice day!

Andrew Lynch


From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of Ken Robbins
Sent: Thursday, January 27, 2011 12:54 PM
To: n8vem...@googlegroups.com
Subject: Re: [N8VEM-S100:49] Re: Z80 and SIO board running


Thanks for the info guys. I'm currently in the cpm chicken/egg situation right now. I've been working on getting things going without cpm running and now I need to work on that. It's going to be a fun weekend.


On Mon, Jan 24, 2011 at 3:34 PM, Andrew Lynch <lyn...@yahoo.com> wrote:

Hi!  Michael Haardt (N8VEM builder) has made these excellent CP/M tools for
Windows to assist in the moving of files to and from CP/M disk images.
We've used these for various N8VEM CP/M file manipulation and they work
great!  Maybe they could be adapted for this application?

The source code is available if anyone wants to take a whack at it.


Thanks and have a nice day!

Andrew Lynch

> -----Original Message-----
> From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On

> Behalf Of John Monahan
> Sent: Sunday, January 23, 2011 11:33 PM
> To: n8vem...@googlegroups.com

> Subject: RE: [N8VEM-S100:40] Re: Z80 and SIO board running
> Kenro, I'm running all my S100Computers.com  type  boards here at 10MHz (+
> two I/O wait states). Cannot speak for other boards.
> As it turns out I have just revisited the IDE board we did this time last
> year.  I want to do a dual drive/ CD card version, so I have been thinking
> about software for it again.  Am redoing the diagnostic program right now.
> As to a kind of plug & play approach the issue, is it becomes equation of
> benefit/effort. If it's to help people get around the chicken/egg
> bringing
> CPM up the first time from a PC I thinking perhaps dump everything on a
> partitioned drive/CF card under MSDOS/windows and have a simple S-100
> program suck it off one time to get CPM going.  This allows each person to
> fine tune their BIOS etc. first.
> For regular transfers once up, I describe here how I do it over a serial
> connection.
> http://s100computers.com/Software%20Index%20Page.htm
> Not pretty, but works very well.  Unfortunately I don't have the time to
> do
> a proper Windows/CPM shared approach - I 'm hoping somebody else will.
> John
> -----Original Message-----
> From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On
> Behalf Of kenro
> Sent: Sunday, January 23, 2011 5:07 PM
> To: N8VEM-S100
> Subject: [N8VEM-S100:38] Re: Z80 and SIO board running
> I have the eprom/ram board working with 1M and have modified the monitor
> program to work with the sio as the console. Last night I started checking
> out the ide board and my Z80 board quit working.
> After replacing a chip that died, it's running again. I tried an 8Mz osc
> and
> things seem to work fine at that speed. Back to ide board. Any ideas on
> how
> to load the flash drive from a pc?
> On Jan 21, 5:11 pm, Ken Robbins <kenneth....@gmail.com> wrote:
> > Thanks guys!
> >
> >
> >
> > On Fri, Jan 21, 2011 at 2:25 PM, John Monahan <mon...@vitasoft.org>
> wrote:
> > >  I get mine locally Ken, but if you go to the Mouser web site and
> > > type extractors in the keyword they will come up. (overpriced
> however).
> >
> > >http://www.mouser.com/Search/Refine.aspx?Keyword=extractors
> >
> > > May want to search around
> >
> > > John
> >
> > > *From:* n8vem...@googlegroups.com
> > > [mailto:n8vem...@googlegroups.com] *On Behalf Of *Ken Robbins
> > > *Sent:* Friday, January 21, 2011 1:41 PM
> > > *To:* n8vem...@googlegroups.com
> > > *Subject:* Re: [N8VEM-S100:31] Z80 and SIO board running
> >
> > > Do you have a source for the S-100 board extractors?
> >
> > > On Mon, Jan 3, 2011 at 9:57 AM, John Monahan <mon...@vitasoft.org>
> wrote:
> >
> > > Great, Congratulations Ken. Great way to start the new near!
> > > John
> >
> > > -----Original Message-----
> > > From: n8vem...@googlegroups.com
> > > [mailto:n8vem...@googlegroups.com] On Behalf Of kenro
> > > Sent: Sunday, January 02, 2011 11:01 PM
> > > To: N8VEM-S100
> > > Subject: [N8VEM-S100:20] Z80 and SIO board running
> >
> > >   I have my S-100 Z80 board running with the Serial-IO in a very
> > > rudimentary fashion. These are the only 2 S100 boards I have at the
> > > moment and they are running in a old compupro case. I wrote test
> > > program that sends 'Hi!' to the serial port on reset and then echos
> > > back any character typed on the terminal. If the character is an
> > > 'A', diode A16 lights on the cpu otherwise A17 lights. Next board
> > > will be EPROM/RAM board.
> > > Ken- Hide quoted text -
> >
> > - Show quoted text -