3 Sep
2002
3 Sep
'02
4:22 p.m.
You might want to check out the following project if you want to build your
own small PDP-8. David Conroy has implemented a PDP-8i in an FPGA.
http://surfin.spies.com/~dgc/pdp8x/
I might have some info on the 6100, I'll have to try and remember. I've got
databooks from them and I believe Harris that list it.
Zane
I think it used unobtainium type RAM and ROM, being
all early Intersil CMOS, so it might be very difficult
to make an "authentic" one today even if you had a
6100. The 6100 was, given my limited knowledge, harder
to make truly PDP8/e compatible than the later 6120.
I've looked around for a ROM listing or front panel
code for the 6100/Intercept with no luck.
--- "Peter C. Wallace" <pcw(a)mesanet.com> wrote:
On Tue, 3 Sep 2002, Ethan Dicks wrote:
ever run across
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--- Mike <dogas(a)bellsouth.net> wrote:
>
> I just had to nominate the Intersil Intercept
Jr. to the early laptop
catagory,
Runs on batteries, fits in a lap.
;) - Mike: dogas(a)bellsouth.net
Are there plans out there anywhere? I doubt I'll a real one. They looked kinda cool back when I
was a kid, but at
the time, I didn't understand what it meant
to be
PDP-8-instruction-
set compatible (i.e., the implications of it, not
the literal sense
of "compatible").
It had, IIRC, some toggle switches, LEDs, and 4KW
of SRAM, right?
-ethan
The intercept had those, the Intercept Jr only had a
keypad and numeric LED
display. It only 256 or 1K (12 bit) words of RAM
ISTR
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Peter Wallace
4 Sep
4 Sep
1:40 a.m.
You can also build one from a 6120 (possibly easier to
find), which can be found in DECMate boards among
other DEC spares:
http://www.sparetimegizmos.com
I built one of these, wire wrapped:
http://juliepalooza.8m.com/sl/main.htm
http://juliepalooza.8m.com/sl/pdp8e.htm
It's a lot more fun than an Intercept might be,
because it can run OS/8.
--- "Zane H. Healy" <healyzh(a)aracnet.com> wrote:
You might want to check out the following project if
you want to build your
own small PDP-8. David Conroy has implemented a
PDP-8i in an FPGA.
http://surfin.spies.com/~dgc/pdp8x/
I might have some info on the 6100, I'll have to try
and remember. I've got
databooks from them and I believe Harris that list
it.
Zane
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I think it used unobtainium type RAM and ROM,
being
all early Intersil CMOS, so it might be very
difficult
to make an "authentic" one today even
if you had a
6100. The 6100 was, given my limited knowledge,
harder
to make truly PDP8/e compatible than the later
6120.
I've looked around for a ROM listing or front
panel
code for the 6100/Intercept with no luck.
--- "Peter C. Wallace" <pcw(a)mesanet.com> wrote:
> On Tue, 3 Sep 2002, Ethan Dicks wrote:
>
> >
> > --- Mike <dogas(a)bellsouth.net> wrote:
> > >
> > > I just had to nominate the Intersil
Intercept
> Jr. to the early laptop
> > > catagory, Runs on batteries, fits in a lap.
> > >
> > > ;) - Mike: dogas(a)bellsouth.net
> >
> > Are there plans out there anywhere? I doubt
I'll
> ever run across
> > a real one. They looked kinda cool back when
I
> was a kid, but at
> > the time, I didn't understand what it meant to
be
> PDP-8-instruction-
> > set compatible (i.e., the implications of it,
not
> the literal sense
> > of "compatible").
> >
> > It had, IIRC, some toggle switches, LEDs, and
4KW
> of SRAM, right?
> >
> > -ethan
>
> The intercept had those, the Intercept Jr only
had a
> keypad and numeric LED
> display. It only 256 or 1K (12 bit) words of
RAM
> ISTR
>
>
>
>
>
> >
> >
> >
> >
> >
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Peter Wallace
2:27 a.m.
--- Loboyko Steve <sloboyko(a)yahoo.com> wrote:
You can also build one from a 6120 (possibly easier
to
find), which can be found in DECMate boards among
other DEC spares:
http://www.sparetimegizmos.com
Right. I have the DECmates (a DM-II that runs OS-278 from an ST225,
and a DM-III that's RX50-only). I looked at getting circuit boards,
but in the small quantities they've been made in, I just can't
justify the cost.
I built one of these, wire wrapped:
http://juliepalooza.8m.com/sl/main.htm
http://juliepalooza.8m.com/sl/pdp8e.htm
That's more up my alley. If I didn't have any working PDP-8s, I'd
consider it.
It's a lot more fun than an Intercept might be,
because it can run OS/8.
True, but I already _have_ hardware that runs OS/8. The interest
is in a battery-powered 25-year-old design.
This isn't about "making a PDP-8". It's about playing with the
Intercept in particular because I remember it and never got the
chance back in the old days. As I said, I don't expect to run
across one; I'm not planning on paying hundreds of dollars even
if I did. I was simply curious if there were plans out there,
mostly to read through them.
Thanks,
-ethan
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