Hi!  If you are interested in building your own homebrew Z80 CP/M
single board computer please contact me.  I have many PCBs available
for the N8VEM SBC and all the peripherals.  You build the computer
yourself using the PCBs you either make them yourself or you can buy
the ECB Eurocard PCBs for $20 each plus shipping.

There are several PCBs available:

SBC (Z80 CPU, 512K SRAM, 1MB ROM, serial port, parallel port, RTC, and
ECB bus interface)
ECB backplane (6 slots)
ECB bus monitor (with bus status, address trapping, and single step
modes)
ECB prototyping board (with IO decoding circuitry)
DiskIO (floppy and IDE interfaces)
Zilog Peripherals (CTC timer, DART dual serial, dual PIO with 4 eight
bit parallel ports)
VDU (video interface with PS/2 keyboard, PS/2 mouse, and parallel
printer port)
6809 host processor (128K SRAM, 2K ROM, expansion bus)

I just received the PCB for the 6809 IO mezzanine board (ACIA serial,
PTM timer, dual VIA parallel ports and timers, and expansion bus).  An
N8VEM builder has ported CUBIX to the 6809 host processor and we are
working to get the 6809 IO mezzanine supported.

Builders can boot from floppy disks, IDE, ATAPI, and/or ROM images.
Some use CF adapters.  The system can use the serial IO terminal or
the VDU for self contained booting.  Interfaces with the DSKY board
(available from a different builder other than me) for "front panel"
like interface to the monitor.

There are more PCBs in work including a PropIO (VGA, PS/2 keyboard,
microSD, and prototyping area with 14 spare IO pins) that should be
available soon.  I estimate the PCBs will be available in early Feb
2010.

All the design information for the N8VEM hardware and software is
freely and publicly posted.  Please feel free to join us if you would
like to participate.

http://n8vem-sbc.pbworks.com/

http://groups.google.com/group/n8vem

Thanks and have a nice day!

Andrew Lynch

On Jan 13, 7:21=A0pm, lynchaj <lync...@yahoo.com> wrote:
> Hi! =A0If you are interested in building your own homebrew Z80 CP/M
> single board computer please contact me. =A0I have many PCBs available
> for the N8VEM SBC and all the peripherals. =A0You build the computer
> yourself using the PCBs you either make them yourself or you can buy
> the ECB Eurocard PCBs for $20 each plus shipping.
>

Hi!  One of the N8VEM builders just posted this photo of a completed
system.

http://n8vem-sbc.pbworks.com/f/n8vem_case_nb.JPG

The homebrew computer is functionally complete with all the components
you would expect of a system of the late 1970's early 1980's era.

Andrew Lynch

lynchaj ha scritto:

> http://n8vem-sbc.pbworks.com/f/n8vem_case_nb.JPG
> 
> The homebrew computer is functionally complete with all the components
> you would expect of a system of the late 1970's early 1980's era.

Sadly the 3.5" drive ruins this retro-homebrew look...
But, side note, what function(s) have the two leftmost LED in every led 
row ?

Best regards from Italy,
Dott. Piergiorgio.

On Jan 16, 4:03=A0am, "dott.Piergiorgio"
<dott.PiergiorgioNI...@KAIGUN.fastwebnet.it> wrote:
> lynchaj ha scritto:
>
> >http://n8vem-sbc.pbworks.com/f/n8vem_case_nb.JPG
>
> > The homebrew computer is functionally complete with all the components
> > you would expect of a system of the late 1970's early 1980's era.
>
> Sadly the 3.5" drive ruins this retro-homebrew look...
> But, side note, what function(s) have the two leftmost LED in every led
> row ?
>
> Best regards from Italy,
> Dott. Piergiorgio.
Hi,
Here are the functions of the LED's;
-	-	A15	A14	A13	A12	A11	A10	A09	A08
RES	-	A07	A06	A05	A04	A03	A02	A01	A00
IEO	IEI	D7	D6	D5	D4	D3	D2	D1	D0
HLT	NMI	WAIT	INT	WR	MREQ	RD	RFSH	IORQ	M1
BUSRQ	BUSAK	H4	H3	H2	H1	IN=3D	WAITA	FF	DATA_O

Kind Regards,
Nik

On Jan 15, 6:50=A0pm, Nik Brisevac <nbrise...@optusnet.com.au> wrote:
> On Jan 16, 4:03=A0am, "dott.Piergiorgio"<dott.PiergiorgioNI...@KAIGUN.fas=
twebnet.it> wrote:
> > lynchaj ha scritto:
>
> > >http://n8vem-sbc.pbworks.com/f/n8vem_case_nb.JPG
>
> > > The homebrew computer is functionally complete with all the component=
s
> > > you would expect of a system of the late 1970's early 1980's era.
>
> > Sadly the 3.5" drive ruins this retro-homebrew look...
> > But, side note, what function(s) have the two leftmost LED in every led
> > row ?
>
> > Best regards from Italy,
> > Dott. Piergiorgio.
>
> Hi,
> Here are the functions of the LED's;
> - =A0 =A0 =A0 - =A0 =A0 =A0 A15 =A0 =A0 A14 =A0 =A0 A13 =A0 =A0 A12 =A0 =
=A0 A11 =A0 =A0 A10 =A0 =A0 A09 =A0 =A0 A08
> RES =A0 =A0 - =A0 =A0 =A0 A07 =A0 =A0 A06 =A0 =A0 A05 =A0 =A0 A04 =A0 =A0=
 A03 =A0 =A0 A02 =A0 =A0 A01 =A0 =A0 A00
> IEO =A0 =A0 IEI =A0 =A0 D7 =A0 =A0 =A0D6 =A0 =A0 =A0D5 =A0 =A0 =A0D4 =A0 =
=A0 =A0D3 =A0 =A0 =A0D2 =A0 =A0 =A0D1 =A0 =A0 =A0D0
> HLT =A0 =A0 NMI =A0 =A0 WAIT =A0 =A0INT =A0 =A0 WR =A0 =A0 =A0MREQ =A0 =
=A0RD =A0 =A0 =A0RFSH =A0 =A0IORQ =A0 =A0M1
> BUSRQ =A0 BUSAK =A0 H4 =A0 =A0 =A0H3 =A0 =A0 =A0H2 =A0 =A0 =A0H1 =A0 =A0 =
=A0IN=3D =A0 =A0 WAITA =A0 FF =A0 =A0 =A0DATA_O
>
> Kind Regards,
> Nik

Hi Nik!  Thanks!  There is also the DSKY panel on the top of the
computer that allows many "front panel" like functions and direct
interface to the monitor.

DSKY is very nice indeed and I use mine all the time.  It is
especially powerful when used with the ECB bus to monitor and trap
addresses for single stepping.

Thanks and have a nice day!

Andrew Lynch