Amstrad CPC

Anything relating to non Sinclair computers from the 1980's, 90's or even before.
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PeterJ
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Amstrad CPC

Post by PeterJ » Thu Feb 22, 2018 5:33 pm

I have always been put off spending much time with the CPC range because what I considered a more chunky graphics resolution than the Spectrum offered, although of course no colour clash.

Mode 0: 160×200 pixels with 16 colours (4 bpp)
Mode 1: 320×200 pixels with 4 colours (2 bpp)
Mode 2: 640×200 pixels with 2 colours (1 bpp)
Mode 3: 160×200 pixels with 4 colours (2bpp)

Am I missing anything?
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AndyC
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Re: Amstrad CPC

Post by AndyC » Thu Feb 22, 2018 6:36 pm

That's right, for a given definition of right. The CPC's video hardware is fairly flexible and those pixel dimensions are only true if you use the default 40*25 arrangement. You can change it to have different dimensions if you like so you could, for example, set up a 32*24 character screen and have 256*192 pixels in Mode 1 - which a lot of Speccy ports do, for fairly obvious reasons.
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1024MAK
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Re: Amstrad CPC

Post by 1024MAK » Thu Feb 22, 2018 7:29 pm

PeterJ wrote:
Thu Feb 22, 2018 5:33 pm
Am I missing anything?
Apart from mode 3, These are only what BASIC supports.

More info on the CPC Wiki

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danlucio
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Re: Amstrad CPC

Post by danlucio » Fri Mar 02, 2018 9:46 pm

Are there cpc clones around the world like ZX line?
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PeterJ
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Re: Amstrad CPC

Post by PeterJ » Fri Mar 02, 2018 10:16 pm

Hi, @danlucio It looks like there were a number including one from East Germany.

https://en.m.wikipedia.org/wiki/Amstrad_CPC

Go to the models / clones section
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danlucio
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Re: Amstrad CPC

Post by danlucio » Fri Mar 02, 2018 11:41 pm

PeterJ wrote:
Fri Mar 02, 2018 10:16 pm
Hi, @danlucio It looks like there were a number including one from East Germany.

https://en.m.wikipedia.org/wiki/Amstrad_CPC

Go to the models / clones section

Thx PeterJ, looks like ZX line was by far much more cloned
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Ralf
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Re: Amstrad CPC

Post by Ralf » Sat Mar 03, 2018 8:52 am

The graphic modes that you mention are "official" modes

Just like with Spectrum multicolor you can do some tricks on CPC.

One trick which I have seen is changing the palete in the middle of the screen

See Strider. It's 4 colour mode but playing area and menu have different sets of colours:

Image
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Pegaz
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Re: Amstrad CPC

Post by Pegaz » Mon Mar 12, 2018 7:01 pm

Amstrad also has overscan capabilities, so the screen can be expanded in all modes to 264x192, 544x384 and 768x544 pixels.
I dont know how many games are using this technique, but there are some examples in overscan mode:

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spectron
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Re: Amstrad CPC

Post by spectron » Tue May 15, 2018 11:12 am

You might also notice a similarity with the BBC micro. Could be because they both used the Motorola 6845 video generator.

& CGA in the PC for that matter
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Joefish
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Re: Amstrad CPC

Post by Joefish » Tue May 15, 2018 12:34 pm

Apart from Spectrum clones, that came across with blocky attributes, not a lot of games used the 4-colour mode. And the ones that did showed some poor choices of colour. Look at that Strider screenshot - the scoreboard is better coloured than the game!
Head Over Heels looks particularly good. Although what you might notice there, and in a few other games, is sprites only appearing to use two colours. What they're actually doing is using two colours and black, and they're using the fourth colour index in the bitmap as the mask of the sprite, to save having to have a separate mask. Knight Lore doesn't even use the remaining colour in the backdrops. But it's sprites won't take up any more memory than the Spectrum ones.
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