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RE: [N8VEM-S100:55] Re: Z80 and SIO board running

Glad to hear you got it working Ken. I had not tried the 82C55’s. Have been using AMD 8255A-5 (from Jameco).   I’m not sure why you cannot read the 2 & 1G CF cards.  I’m using 4 & 8G “Kingston” brand. Perhaps the LBA addressing is different.  Note some older CF cards require 5Volts (instead of 3.3V). Did you set the jumper correctly on the adaptor.  One thing I did find is:-  it is absolutely essential to use a 74S04 for U4. I think a 74H04 will do as well. I don’t exactly know why, but the LS’s will not work.


I’m not exactly sure what you mean by the” ide reset problem” could you explain more.


I’m currently redoing the IDE diagnostic program to allow more options, such as Sysgen, disk copy etc.  Andrew and I are doing a dual CF card S-100 board update on this IDE board.


I too am counting the days to get the final ZFDC board. It’s been our longest board so far (3 prototypes!) but it was worth it --  I think.






From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of Ken Robbins
Sent: Saturday, February 05, 2011 9:27 PM
To: n8vem...@googlegroups.com
Subject: Re: [N8VEM-S100:55] Re: Z80 and SIO board running


I have CPM3 booting from the CF. I had a lot of problems getting the CF card to work right. I couldn't get any 82C55 to working in my system so I scrounged a 8255A off an old board and that would load the boot loader off 2 of my CF cards. I reassemble the IDE test program so it would load  from eprom to help with testing. So far the only card that works in the system is the 8GB. The 2G and 1G cards will not work for me although I got one to boot the loader. I found the ide reset caused a problem so I bypassed it and things started working the way I thought they should. I used HxD to load the loader and cpm files to the cf disk. I really like the looks of the new floppy controller and am looking forward to building it. I have 2 8 inch drives that I got off ebay and I hope they work.



On Sat, Jan 29, 2011 at 7:56 AM, lynchaj <lyn...@yahoo.com> wrote:

Sorry, forgot the URL.  Please send updates on your build progress to
S100computers.com or make a new page at the N8VEM wiki.  New builders
will ask many of the same questions and experiences you are doing now
so recording your effort will help future builders.

Thanks and have a nice day!

Andrew Lynch


On Jan 29, 10:12 am, "Andrew Lynch" <lyn...@yahoo.com> wrote:
> 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.
> Ken  

> 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.
> http://www.moria.de/~michael/cpmtools/
> 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.