Name: 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)
Uploaded: 2021-01-14T10:38:21.000Z
Duration: 10 min 20 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

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

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.

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.

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

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

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

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

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

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

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.

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 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.

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.

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.

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.

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.

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.

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.

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

gives you your keyboard and the spectrum itself.

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.

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.