Spectrum Computing

Hi,

I follow the instructions in this video: https://www.youtube.com/watch?v=AbIJza7ElrE

Ciao
Leo

Yes, I got that one, since I was missing the so-called 'Issue 1.5' motherboard in my collection

They are quite rare, possibly even more than Issue 1 ones. Now if I only could put my greedy hands on an Issue 5 (something which I know will never happen...)

Try Antonio Villena's website: https://antoniovillena.com/

Hi,

For those not too far from Cambridge, it's on during the first weekend in November.

https://www.computinghistory.org.uk/det ... -November/

Ciao
Leo

Well, that sounds interesting, thanks for putting some missed bedtime into it!

Ciao
Leo

My original 16K ZX Spectrum, bought in Siena sometimes in 1983 (I remember being offered the choice between the 16K and 32K models by the shop owner!) and soon updated to 48K after a trip to Florence to get the necessary chips, still lives happily

Have you already looked at this site? https://divide.speccy.cz/

Maybe it needs a backplane, like the one here: http://projectspeccy.com/projects/ (scroll down until you find Sinclair Spectrum Backplane)

It would need some adaptation, but it should be feasible.

Hmm, I don't think TR8 needs to be flipped, only the three 2N3904s.

It might have been mentioned already, but back in 1984 a few ZX Spectrum were used by RAI (the "Italian BBC") during the Giro d'Italia, as described in these articles (in Italian)
https://quattrobit.blogspot.com/2021/01 ... -1984.html

I can only agree, I have a couple of those SPECTRA+128 interfaces, and they are great!

Just make sure yours is a grey +2, since otherwise an adapter is needed.

Try doing a recap, I've seen similar artifact disappear with a fresh set of capacitors.

Good to know, I sent them a number of mails over time but never got a reply.

As you're located in the UK you can get the same stuff from ZX Renew (https://zxrenew.co.uk/Replacement-Micro ... p297531870) and avoid the risks of shipping from China: after more than two years since I ordered (and paid for) it, I'm still waiting for a replica of the Toastrack keypad

Let's not forget the Spectrum has also an original 32KB RAM extension, those are not common either...

Hi,

Probably it's just the rubber belt of the datacorder, which after ~35 years needs replacing Plenty of videos showing how to do it on YouTube.

One important fact: is your +2 grey or black? The number of belts differ between the two models.

Ciao
Leo

Great, thanks!

Hi Tom,

Talking about the latest version of your OqtaDrive QL (v1.2), where can I find the BoM?

I ordered a few of them from PCBWay, but now I'm stuck. I think I saw it linked to the previous version (v1.1)?

Thanks

Ciao
Leo

Same here, I might find some time to dig them up during the WE

dfzx wrote: ↑Wed Jan 25, 2023 2:43 pm It is indeed, yes. I needed separate power and ground planes.

Great, thanks for the quick confirmation!

Hi,

When I upload the Gerber files (fab1.2.zip) to JLCPCB the system tells me that it's a 4-layer circuit: is that correct?

Thanks

Ciao
Leo

Check the voltages, 12V are needed for the video section to work properly.

This one being an Issue 2, another possibility is that potentiometers VR1 and VR2 need to be adjusted.

Ciao
Leo

There you go, the link to a snapshot of an Issue 1 from the back

https://1drv.ms/u/s!As1H_JFb9yqcyj_txmg ... g?e=msTW16

Hi,

This is just one of many images you can find: https://spectrumforeveryone.com/wp-cont ... ssue-1.jpg

Please do note this photo includes the 32K expansion, which should be missing in your case.

Ciao
Leo

Trox wrote: ↑Sat Nov 26, 2022 12:32 am It’s a grey one drdivago

Ok, I cannot promise anything due to the terrible mess in my flat, but if I bump into the spare buttons I know I have somewhere I'll let you know: it's the rewind buttton, right?