Spectrum Computing

A lot of small improvements are part of these updates but tend to go a bit unnoticed. I've added border colour information to a lot screenshots. It doesn't take much time and it really makes a difference on listings. Just mentioning this because there are lots of ways to participate, besides adding ...

Perhaps a dumb approach, like simply counting + and - pulses during fixed amounts of time would do. Just guessing really

I'd say it needs a much higher sample rate to fully capture whatever pulse modulation the sound engine is using.
After that, eventually apply a low pass filter to simulate the dampening characteristics of a physical speaker.

I think it's important that the graphics retain a certain "Spectrum feel". In my opinion, the only enhancements that still look Spectrum are ULAPlus, 8x1 attributes, and 256x192x16 (ex: ATM / Pentagon no attributes). I think the ULAPlus/ULAPlus HAM modes are interesting because they are de...

PSSST fixed.
(Alien 8 and Sabre Wulf also reverted to the original gifs. Will be fixed by updated screens as mentioned in the previous posts)

(can't edit my last post, so let me add this here) Original colour test chart: https://upload.wikimedia.org/wikipedia/commons/b/b8/RGB_24bits_palette_color_test_chart.png Test chart under 4-bit RGBI (Red, Green, Blue, Intensity) 16-colour hardware palettes (no dithering): A - most basic implementat...

The Spectrum used a 4-bit RGBI (Red, Green, Blue, Intensity) hardware palette. There are 3 ways of displaying it, with increasing hardware complexity: A - most basic implementation) Intensity changes brightness , like on the Spectrum. Another simple possibility is to change saturation . The Thomson ...

International Karate has nice speech: "Full point red", "half point red", "begin", etc.

Another possibility, perhaps simpler, would be to use the existing "Remarks" field. "Remarks" can already point to hardware, for example the Kempston Mouse: https://spectrumcomputing.co.uk/entry/14620/ZX-Spectrum/Kempston_Mouse_Interface_Driver We have hardware entries for most (...

Einar you are right, we can't have 42 ZX81 machine types :D On the other hand, I think we should (somehow) record the required hardware, as indicated on the software inlay, instructions, etc. Perhaps we could have an optional machine variation field? It could cover both memory variations and/or spec...

Seems to be another similar one here @4thRock: https://spectrumcomputing.co.uk/entry/38773/ZX81/Planeta_da_Morte The TS1000 was supposed to be very close to the ZX81 (100 or 99.9% compatible). But in these cases instructions clearly indicate TS 1000 & TS 1500, so we might add those machine type...

Another one too. It's marked as ZX81, but has a colour screen: https://spectrumcomputing.co.uk/entry/38705/ZX81/Desenho_I I'm not familiar with the Timex models, but does there need to a new machine type of Timex 1000? Peter, the inlay and instructions for "Desenho I" (translates to Drawi...

Here's a 30 minute conversion of the Arcade image, with minor retouching:


Looks much better than the original I think!
Sure, modern tools help a lot, but there's no reason for bad looking Spectrum graphics.

ATF and Sleepwalker fixed.

Sorry for the delay

MAX Desktop, Paperboy2 and Spaced Out fixed.
(the GIF for MAX Desktop is now displayed, but it has the bottom line missing.)

I wonder if the horizontal stripes produce a better result on old TVs? I'll need to try it on my telly over RF and see. ... I think I read somewhere the colours were organised in tone order (0–7, darkest to lightest) so that it would be easier to work with black and white TV sets. Some TVs used non...

Snodgits, Ian Botham's Test Match, Superkid, Fruit Machine and Santa's Xmas Caper fixed.

4thRock comes from an early interest in astronomy. Earth is the 3rd rock from the Sun, and Mars is the 4th

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I don't think the layout is too white. But for the benefit of those who do ;) , perhaps the post and forum background colours could be swapped. On the new layout, the post background is white and the forum background is slightly gray. It was the other way around on the original layout, Playing with ...

Check this post:
viewtopic.php?p=97355#p97355

You can't post private communications (such as emails) on a public site. Especially now, with privacy regulations adopted in most countries.

I get the first location with a flashing cursor but I can't move it. What are the keys ? Does it use mouse?
The graphics could be much better - there's good autoconversion software around, but more on that later. For now, I'd just like to be able to click on something...

The Spectrum generates an analog PAL signal, with colours very similar to test pattern generators common at that time. If you look at the EBU/IBA colour bars (https://en.wikipedia.org/wiki/EBU_colour_bars) you find a similar 100% / 75% luminance set of saturated RGB bars. That's similar to the Spect...

Indeed, it might be a colour space /colour profile issue. The default colour space format for internet images is sRGB, but that's an old standard. Many devices now use wider spaces, and browsers / operating systems will convert them for display. For example, here's a colour cube encoded as sRGB: htt...