Topic: Retro machine entry corrections.  (Read 1354 times)

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Offline Snial

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Retro machine entry corrections.
« on: July 15, 2010, 01:54:39 PM »
Hi guys,

I'm not sure how to comment on 'corrections' for retro machine entries. Obviously you've put a lot of work in it, but how does one post corrections?

For example, for the Vic-20; it says that it didn't suffer from colour clash. However, sometimes the VIC-20 did. Vic-20 graphics were supported via definable characters; so there's up to 22x23 character positions on the screen and the corresponding character bitmaps could be redefined. The colours worked the same way: a colour attribute area with 1 colour entry per character on the screen.

So, the 'high resolution' graphics had colour clashing. What you could do was get each character byte to be displayed in either 2 colour or 4 colour mode. In 4 colour mode each corresponding character bitmap scan was divided into 4x2-bit pixels: Ink, Paper, Auxiliary, Border. So, then you could have 4-colours per pixel at a 88x184 resolution (without colour clashing) and yet different character positions could have different ink and paper colours (which could still produce clashes).

Sorry for being so pedantic!

-cheers from snial @P

Offline AndyRCM

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Re: Retro machine entry corrections.
« Reply #1 on: July 15, 2010, 02:03:30 PM »
No problem - I did a lot of the inputting very early on and there are bound to be lots of mistakes in there . . .

I don't ever remember seeing colour clash on the Vic20 but I certainly agree with what you are saying.

thank you for pointing that out - if anybody else spots anything please do let us know through this thread.

Cheers

Andy

ps I will update when I get five minutes to do so. :)
"I could see the faces of those who led pissing themselves laughing" - Funeral Pyre by The Jam

Offline AndyT

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Re: Retro machine entry corrections.
« Reply #2 on: July 16, 2010, 11:47:05 AM »
The 464 plus needs updating too.

The plus range of machines had a few enhancements over the standard range. For example, bigger colour palette and DMA sound. Some info here : http://en.wikipedia.org/wiki/Amstrad_CPC
Andy
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Offline resident paul

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Re: Retro machine entry corrections.
« Reply #3 on: July 16, 2010, 01:16:04 PM »
I having trouble finding the TI 99/4a on the list of machines you have?

Offline AndyRCM

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Re: Retro machine entry corrections.
« Reply #4 on: July 16, 2010, 01:28:31 PM »
We are still updating the website mate. We need to add at least another 80 or so machines to the list.

A
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Offline woody.cool

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Re: Retro machine entry corrections.
« Reply #5 on: July 17, 2010, 03:06:12 PM »
The 464 plus needs updating too.

The plus range of machines had a few enhancements over the standard range. For example, bigger colour palette and DMA sound. Some info here : http://en.wikipedia.org/wiki/Amstrad_CPC
Also, the Plus range had a blitter chip (like the Amiga has :o ) although doubt any games actually use it.

Offline Scarlettkitten

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Re: Retro machine entry corrections.
« Reply #6 on: July 17, 2010, 03:28:19 PM »
TI99/4A added & Amstrad plus series blitter and DMA updated.