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RE: [N8VEM-S100:698] Re: S-100 VDP prototype board PCBs are here

The FMS6141 is a video filter, as I recall you can leave it off and go with
the 2N3904 based amp instead, it needs to be one or the other, not both.

I ordered the 6141 from Digikey -

Note that I have NOT verified the info below, it is based on looking at the

If you use the FMS6141 I believe these other parts are needed as well:  

P36 FMS4161
R28 0 Ohm (wire jumper)
R29 470 Ohm
C24 0.1uF
R30 75 Ohm
R31 75 Ohm
C26 220uF
C27 0.1uF
Jumper L1 (this will supply VCC to the FMS6141) or use an Inductor bead to
limit noise back onto VCC

If you are not using the FMS4161 then you will also need:

Q1 2N3904
C25 22uF
L1 Inductor Bead

Again this is a guess based on what I see in the schematic; there was a
discussion some time ago on another thread about a similar design on another
board; I haven't been able to find that discussion however.


-----Original Message-----
From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On
Behalf Of Elsid
Sent: Wednesday, February 08, 2012 12:53 PM
To: N8VEM-S100
Subject: [N8VEM-S100:698] Re: S-100 VDP prototype board PCBs are here

When I checked my parts for the VDP I discovered I'd forgotten the
FMS6141 IC.
There doesn't seem to be anything available locally that will do the job.
It'll take about a week to come in from RS Components. I know they are a bit
pricey, but they don't have a minimum order for their free delivery if you
order online in Australia, unlike Element 14 or XON(Mouser agents) or
Digikey. (I don't have any association with RS)


On Feb 8, 8:08 am, Elsid <le...@swiftdsl.com.au> wrote:
> Hi Neil,
> I think I have most if not all of the parts for the VDP now.
> I will most likely build the board this weekend.
> What were you going to try as far as software?
> I thought I'd try building a text driver for CP/M 3 first, though it 
> would be nice to see MSX running on an S-100 machine.
> Leon
> On Feb 8, 4:37 am, "Neil Breeden" <nbre...@comcast.net> wrote:
> > I'm wondering who else is testing / building an S-100 VDP board?
> > I have my board assembled and all the parts in hand with the 
> > exception of one part, the 1.2V zener/voltage reference. Nobody in 
> > my area stocks the voltage reference listed in the schematic, I'm 
> > waiting to get an order above the minimum on Digikey so I can kick off
an order.
> > -Neil
> > From: n8vem...@googlegroups.com 
> > [mailto:n8vem...@googlegroups.com] On Behalf Of Andrew Lynch
> > Sent: Thursday, December 29, 2011 4:35 PM
> > To: n8vem...@googlegroups.com
> > Subject: [N8VEM-S100:634] S-100 VDP prototype board PCBs are here
> > Hi!
> > I've already sent S-100 VDP prototype board PCBs to Dave and Neil 
> > for build and test.
> > However if anyone else would like to participate in the build and 
> > test phase please let me know.
> > This is going to be a fun project and has the potential for somewhat 
> > VGA compatibility.
> > It also lays the foundation for a potential MSX2 compatibility for 
> > the S-100 bus.
> > That's unprecedented AFAIK.  It could be very interesting!
> > It is not recommended for new builders though -- this will be "blood 
> > and guts" all the way!
> > Thanks and have a nice day!
> > Andrew Lynch- Hide quoted text -
> - Show quoted text-