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  • So what we have here, Kemp ch 2019 65.

  • So in their collection, this is the 65th thing we've taken in 2019.

  • We're not that far into it.

  • But if we open the box, what we have here is the very birth or the Sinclair Spectrum.

  • So this is the prototype off the Sinclair spectrum.

  • And actually, quite a few people bandy around the world prototype on it might be a pre production prototype, but where it basically looks like a machine.

  • But you said I could issue a while the issue one or whatever that kind of stuff.

  • But this really, really is as early as it gets, we remove it from back there.

  • So if anybody knows the Sinclair Spectrum, it kind of has a little bit of a feel of it.

  • When we was up in the loft of where this came from, S I come from a company called nine Songs when we open the box in the loft where this thing was and we knew there was gonna be some good stuff because we knew the history of the company that we were taking it from.

  • But you open the box and you see this thing and it's got a ll these little signs that it's a spectrum and it is a prototype.

  • But it was like when I was Indiana Jones.

  • Moments when you find treasure, right, Riel treasure.

  • Um, well, this is to last anyway.

  • It is in two parts, so we have the keyboard and we have the main board there.

  • And you've got some little bits there that give you clues, Little Speaker.

  • There is very spectrum like so that's the same ones they use in the actual production model.

  • U H F modulator Over here, voltage regulator.

  • 7805 there on a big old heat sink.

  • And then you've got some other circuitry here to produce.

  • The negative voltage is that the Ram uses Ram chips down here.

  • You l A.

  • But with no actual writing on it.

  • Well, problem hand written stuff.

  • And then there's that 80 CPU, which is the same one that they were putting into these exciting one at a time.

  • That's those x 81.

  • So this is the predecessor to the same clothes as expected.

  • This one person for me has got a lot of fond memories.

  • This machine, that's all.

  • I cut my teeth on.

  • His X 81 had a grand total of one kilobytes of memory.

  • You could expand it.

  • You have a ram pack on the back, but give it another 16 K but intended to wobble.

  • So every time you start tapping your code the Ram pack of movie, you'd lose it all anyway, so that was pointless.

  • But the Sinclair Spectrum had 16 care of memory built in the standard.

  • Then they quickly released the 48 k version as well.

  • So that was taking Tony right now the way you can start to write some good games.

  • Obviously this thing was black and white.

  • No sound nothing like that.

  • Whereas the spectrum had its beeps and we'll have you and color so made it much more salable machine when it comes to games.

  • So this is a production version off the Sinclair spectrum.

  • So this is what that ended up here.

  • So no longer if we got the full travel keys, it was on the prototype.

  • But this little rubber, they feel a little bit like you're pressing dead flesh.

  • I don't know who worked that out, but anyway, but it's you know, a vessel into that little case on a great engineering job to get all of that into there, There's a finished product.

  • Sorry.

  • Yeah, the prototype.

  • And it's ah, production release version.

  • If you look underneath, you could see its well being.

  • Hand wire wrapped wire acting was a really nice way of prototyping boards.

  • So you didn't need to get PC things made or anything.

  • We could have a little tall on this blue wire.

  • Here is a single core wire with an outer sheath on it and that would wrap around these long legs that you can see on dhe make a connection.

  • So you take a pin here, you're gonna join that pin to say over the process.

  • You're running a long run it down over here, you little toe, make a wire at connection there and away you go.

  • So it's quite a rapid way of doing things.

  • Well, of course, here you could see that there's some other soldered wires on as well these on the power lines.

  • So this is joining the power buses together for each of the roads because you tend to have a positive and a negative 05 vote for each of these roads here.

  • That would have taken quite a while to do s, you know, quite painstaking thing.

  • But obviously, you know, this was exciting Time.

  • This is coming up with a new product.

  • We do actually have a CZ.

  • Well, another kind of its pre.

  • This even.

  • We haven't done too much work with it yet, but it is his x 81 that's been butchered to have a bigger wrong capacity on it.

  • The separate board, so you could see they were taking this.

  • X 81 is the absolute starting point.

  • That was the product that was out unthought, right?

  • How we're gonna have more memory to this Having all these features, they start with that kind of jacket, get some more rum space on.

  • It s so I think there's about eight small room sockets on there using smaller bombs in this home was using s so that's kind of a big game.

  • But then that didn't seem to go that far.

  • I think by that time they realised.

  • Now we're gonna need to make a, you know, an actual version ourselves, using very bored here.

  • So the keyboard is not particularly like a spectrum.

  • Somebody pointed out.

  • Actually, it's interesting that they said in the X things missing, but I don't think there's anything other than pure coincidence expect from.

  • Yeah, they were never on their We've never seen them.

  • I can't imagine anybody nicking them to stick on the fridge.

  • S o.

  • I think that's just because they've come off.

  • It's unfortunate, but obviously not very spectrum like spectrum had its own rubber keyboard.

  • So this uses, uh, our s case, which is So this is a standard keyboard, basil, that you could buy a little metal frame there and you could just push.

  • These are best case, which is into the arrest was a chemical radio spares what's still up, and they sell everything on that score.

  • So they've all gone out and bought some arrest case, which is so they've wired this up in a matrix secrecy.

  • There's kind of rows and columns that go across just as on a normal spectrum membrane.

  • And then they've got this really heavy duty again.

  • Our rest connector there.

  • So a d B 25 connector there that connects it to the the main board.

  • Sorry, I was too connected together.

  • gives you your keyboard and the spectrum itself.

  • So yeah, this is really quite exciting.

  • I mean, you don't get this kind of thing come up very often.

  • Obviously, from my experience, when you when you prototype in something, you get this far, you basically prove it's okay.

  • They're probably not the most reliable thing in the world.

  • You got connections there a little bit.

  • If he maybe so you could do some tests, and it's yes, we know this is gonna work, and then you move on to a PCB as soon as you can.

  • But what usually happens is the sooner you get the PC bees and you're excited, right?

  • Let's make one of these up, and you just report the components off your prototype and prototypes end up in a drawer and you keep rubbing it orbits or whatever, as you need them.

  • So it's not very often that something like this comes along in its entirety complete, You know, that's very, very uncommon.

  • So we're really, really lucky.

  • Well, where did you say you found?

  • It s o.

  • This was donated to us.

  • We got contact from lady called Kate Grant.

  • Her husband had a company called nine tolls, and they had various old bits off junk that we might be interested in.

  • They had a PDP 11 really big people and 35 system lemon 70 as well.

  • Various other things on this was kind of a footnote to that, you know?

  • Oh, and there might be a prototype of things like the spectrum.

  • Whatever.

  • Okay, Faintly interested.

  • So, yeah, that was kind of more of a footnote to the other things, But that happens sometimes.

  • People offered to donate things to us on then.

  • We're really excited about the thing that they were less excited about.

  • Um, so it happens a lot.

  • This is Ah, great example that this is the most extreme example.

  • We've come across half.

  • You fight up?

  • Not yet.

  • No way.

  • We're getting some grief online because we haven't done it yet.

  • But unfortunately, day to day business gets in the way.

  • Yes, we definitely are going to, but also, you've got to take a lot of precautions over something.

  • Sure.

  • Yeah, definitely.

  • I mean, this is you know, there isn't another one.

  • We're not gonna do this thing.

  • Any damage.

  • You might look at this and going on this is a little little bit for the cameras Which way?

  • I mean, so there's a couple of things.

  • So the museum has now become museums credited.

  • That's a really big deal to us.

  • That means that we apply procedures and policies to the way that we do what way that we won the museum, but also the way that we do preservation, and it proves that we're taking it seriously.

  • Secondly, regardless of all that, this is special, you know, until we've dumped the rooms, which we're going to do it soon as you can for anybody.

  • That's wondering why we don't just take it in the Palm Reader now, which we were gonna do on day one.

  • But he's ready to 564 rooms 2464 Was it?

  • Yet?

  • There are 256 fours, so I was just expecting needs to be to seven Siri's aprons, as many machines would use but to five syriza different pin out.

  • They need to be treated slightly differently so our reader by default won't read them, so we need to make a little adapter that is gonna take these, convert them into the same pin out to seven Siri's and then we'll read them.

  • That'll just get in the way, Really?

  • On It's just again, one of those little things that needs to be done.

  • Other things get in the way off, but so So there's that.

  • And obviously you don't want to go and do something to this.

  • That's gonna damage the data in those rooms.

  • So we're being ultra careful there also, some of these components are static sensitive.

  • So we do have a static mats here and with Earth, and I'm wearing these gloves and the gloves are again, Not necessarily for the static, but they're about getting all in Greece and things off your hands on these things.

  • You know, we are really, seriously taken taking all this.

  • So it's, you know, it's about preserving these and treating them in the best way we possibly can.

  • But yes, we're gonna try, and far up as soon as what we're going to take all the components out.

  • Well, parents make sure we've got the right voltage is so we have a little negative alters converted there for the ran.

  • Make sure that sticking out the right voltage make sure the fire is being dropped down properly.

  • I'll be terrible if we just plugged into an adapter in the nine ball, went straight through the regulator or something like that.

  • We're not gonna do that.

  • So we'll take chicken without first put the chips back in and then see where we go from there.

  • Ondas.

  • Soon as we do, we'll let people know.

  • Obviously, there's enough people.

  • We manage the same.

  • Will you put out a video about it?

  • But yet it's almost anything else.

  • Is it work?

  • So the only centuries we just haven't quite got round to it.

  • But it's not for the one of around, kind of Let's get to it this other days of the things we have to do.

  • No, I've got the token so I can later value in at the Valley from emerged air into it and store it back and hand the turkey.

  • And now I've got the token again.

So what we have here, Kemp ch 2019 65.

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ZXスペクトラムのプロトタイプ - コンピュータマニア (ZX Spectrum Prototype - Computerphile)

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    林宜悉 に公開 2021 年 01 月 14 日
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