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RE: [N8VEM-S100:546] Re: looking for an S-100 expert builder to build and test prototype board

Hi!  The V9958 should also work but it does not support composite video

The chips are largely similar from a pin out and functional perspective but
the V9958 contains additional modes the V9938 does not.

Part of the build and test will be hashing out what is required to make the
V9958 work with the socket.

The current design is for V9938 only and would require some jumpers to

Assuming we could get the VGA like interface working the prospects for V9958
are much better.

Thanks and have a nice day!

Andrew Lynch

-----Original Message-----
From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On
Behalf Of yoda
Sent: Thursday, December 15, 2011 1:57 PM
To: N8VEM-S100
Subject: [N8VEM-S100:546] Re: looking for an S-100 expert builder to build
and test prototype board

Never mind on the 4164 - I misread they are 41464's which are 18pin.
Still would like answer on v9958 - they are 2.5 times cheaper than

On Dec 15, 12:52 pm, yoda <y....@r2d2.org> wrote:
> Hi Andrew
> I am a little confused when looking at the schematics and parts list.
> You are showing the 4164 as an 18 pin device but everywhere I look it 
> is a 16 pin device - am I missing something?   Also can a v9958 be 
> substituted as well?
> Dave
> On Dec 14, 5:50 am, lynchaj <lyn...@yahoo.com> wrote:
> > Hi,
> > There is an S-100 board project that is ready for prototype build 
> > and test but the project is "stuck in the mud" due to availability 
> > issues (aka "real life") of the original design team.
> > Is there anyone who would like to take on a build and test of a 
> > rather ambitious S-100 board?  The project I am referring to is the 
> > S-100 VDP which is a video board based on the V9938/V9958 video 
> > display processor.
> > This board has potential for greatly improved color graphics, 80 
> > column text, etc using the latest of the VDPs which descended from 
> > the original TMS9918.
> > I have a design schematic and PCB layout which is ready for 
> > prototype build and test.  However it will stay on the "black board" 
> > until some builder can make it a reality.
> > The design could even be extended to include audio (AY-3-8910 or
> > similar) once we get the video section working.  This would provide 
> > a measure of MSX compatibility for the S-100 bus systems.  There is 
> > quite a bit of stuff we can export from the N8VEM N8 "all in one"
> > project to this board to accelerate an improved design.
> > This board is deceptively simple looking but is not for the feint of 
> > heart.  Video boards never are...
> > Anyone interested?  Thanks and have a nice day!
> > Andrew Lynch