K5synth

First, I'd like to know if the OS EPROM has 28 or 32 pins. If 28, 
continue reading it, if 32 reply me and flush it.

Some people told they didn't wanted to update the OS themselves because 
they need to erase the chip with a UV light, or if they buy a new one 
and get a programming error, they'll have to erase it with a UV(Not 
cheap, don't make one, it's dangerous) so it's a great loss of money if 
you miss it. After some searching, I found(finally) a Flash ROM 
replacement to the EPROM. That means no UV light needed. Here's the part 
number : SST27SF512-70-3C-PG (SST makes them, available @ mouser). Then, 
all you need is a programmer that supports it. There are plenty of them, 
but one I found to make your self is the Willem programmer. 
http://se-ed.net/mpu51/eprom/eprom.html + 
http://www.willem.org/(Available as a kit too). So all you need is to 
get all of these things and the OS HEX file to update it by yourself.

Note: I haven't checked if the Flash ROM is compatible with the 27C512, 
but it might be since it contains 27?512, tells it's CMOS voltage and 
tells it's a good replacements for old EPROMs. Search for 
SST27SF512-70-3C-PG at mouser.com for the datasheet. And 27c512 for the 
27c512'S one.


-- 
antdes45@...

Antoine,

     Just a side note on the topic, the main controller is by NEC, If 
I'm right. NEC made an awful lot of controllers around the time which 
used the Z80 instruction set, sometimes with a few extra special-
purpose instructions - a very underrated processor in it's time, and 
one of the most powerful 8 bit uP's ever.

Cheers

Adam

The NEC V40 processor's in there. It's pretty small for a end '80 CPU.

g0ory@... a écrit:

> Antoine,
>
>      Just a side note on the topic, the main controller is by NEC, If
> I'm right. NEC made an awful lot of controllers around the time which
> used the Z80 instruction set, sometimes with a few extra special-
> purpose instructions - a very underrated processor in it's time, and
> one of the most powerful 8 bit uP's ever.
>
> Cheers
>
> Adam
>
>
>
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-- 
antdes45@...

The V40 is 8086 or 8088 derived, yes? (If I remember from the V20, 
V30.. ;-) (I got sentimental about the Z80 :-) )

Ok, I'll look into OTP devices too. See what I can find - it's been a 
few years since making single board computers, in those days the 
biggest EPROM was a 32k 27256 :-)

Cheers

Adam

--- In k5synth@yahoogroups.com, Antoine Deschênes <antdes45@n...> 
wrote:
> The NEC V40 processor's in there. It's pretty small for a end '80 
CPU.
> 
> g0ory@n... a écrit:
> 
> > Antoine,
> >
> >      Just a side note on the topic, the main controller is by 
NEC, If
> > I'm right. NEC made an awful lot of controllers around the time 
which
> > used the Z80 instruction set, sometimes with a few extra special-
> > purpose instructions - a very underrated processor in it's time, 
and
> > one of the most powerful 8 bit uP's ever.
> >
> > Cheers
> >
> > Adam
> >
> >
> >
> > Yahoo! Groups Sponsor
> > ADVERTISEMENT
> > 
<http://us.ard.yahoo.com/SIG=1297fj4pa/M=306910.5263657.6380312.224846
7/D=grplch/S=1705032144:HM/EXP=1093111549/A=2290377/R=0/SIG=12svasom8/
*http://ad.doubleclick.net/jump/N3390.yahoocom/B1408521.15;sz=300x250;
ord=1093025149238133?> 
> >
> >
> >
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> 
> -- 
> antdes45@n...

Google Search :
NEC V40 (compatible 80286)
NEC V40 CPU:

    * undefined opcode triggers INT6,
    * same speeds,
    * packages:
          o 68 pin PGA (Pin Grid Array)
            <http://ce.et.tudelft.nl/%7Eofferman/cl.1.2.html#PGA>,
          o 68 pin PLCC (Plastic Leaded Chip Carrier)
            <http://ce.et.tudelft.nl/%7Eofferman/cl.1.2.html#PLCC>,
          o 80 pin PFP (QFP (Quad Flat Package)),
    * mPD70208.

Nec V40 (8088)

V40 Computers:
http://www.system-cfg.com/pages/sharp_pc4600.html
http://www.system-cfg.com/pages/olivetti_pc1.html
http://www.mesanet.com/pdf/flatpanel/fpcxds.pdf

Hey, it works in C++

g0ory@... a \ufffdcrit:

> The V40 is 8086 or 8088 derived, yes? (If I remember from the V20,
> V30.. ;-) (I got sentimental about the Z80 :-) )
>
> Ok, I'll look into OTP devices too. See what I can find - it's been a
> few years since making single board computers, in those days the
> biggest EPROM was a 32k 27256 :-)
>
> Cheers
>
> Adam
>
> --- In k5synth@yahoogroups.com, Antoine Desch\ufffdnes <antdes45@n...>
> wrote:
> > The NEC V40 processor's in there. It's pretty small for a end '80
> CPU.
> >
> > g0ory@n... a \ufffdcrit:
> >
> > > Antoine,
> > >
> > >      Just a side note on the topic, the main controller is by
> NEC, If
> > > I'm right. NEC made an awful lot of controllers around the time
> which
> > > used the Z80 instruction set, sometimes with a few extra special-
> > > purpose instructions - a very underrated processor in it's time,
> and
> > > one of the most powerful 8 bit uP's ever.
> > >
> > > Cheers
> > >
> > > Adam
> > >
> > >
> > >
> > > Yahoo! Groups Sponsor
> > > ADVERTISEMENT
> > >
> <http://us.ard.yahoo.com/SIG=1297fj4pa/M=306910.5263657.6380312.224846
> 7/D=grplch/S=1705032144:HM/EXP=1093111549/A=2290377/R=0/SIG=12svasom8/
> *http://ad.doubleclick.net/jump/N3390.yahoocom/B1408521.15;sz=300x250;
> ord=1093025149238133?>
> > >
> > >
> > >
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-- 

Antoine Desch\ufffdnes /aka
  -\ufffd\ufffd`-\ufffd-DragonMaster-\ufffd-\ufffd\ufffd`-
http://thehotcom.deep-ice.com/
Files: http://www.angelfire.com/ca7/hotcomcenter/