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Message from discussion RFC: ULA Replacement for ZX Spectrum SE
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Geoff Winkless  
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 More options May 17 2000, 3:00 am
Newsgroups: comp.sys.sinclair
From: "Geoff Winkless" <geoff-at-farmline-dot-...@127.0.0.1>
Date: 2000/05/17
Subject: Re: RFC: ULA Replacement for ZX Spectrum SE
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"Matthew Westcott" <gas...@raww.org.RemoveThisBit.invalid> wrote in message

news:8F359FDD9gasmanrawworg@163.1.2.7...

> On 15 May 2000, Equin0x wrote this message in comp.sys.sinclair. Which was
> nice.

> >> How should the palettes be selected (OUT commands etc?)

> >System variables? (I know there aren't technically any unused ones, but
> >since it's a custom ROM, there might be.)

> I think I'd prefer OUT commands. The process of choosing colours is
> external to the ROM, and it would be nice to have it handled by OUTs in a
> similar way to the sound chip or the border colour. On the other hand,
> using memory locations would make colour cycling easier (only slightly
> easier though).

The way the Sam Coupe handled it was BASIC kept a copy of the current
palette in memory but the actual palette was OUT only.

I often thought how nice it would have been to have been able to read the
palette with IN, but really it wouldn't have made that much difference...

On an aside, I have to say that it seems a tad ... pointless to reproduce
MGT's work, which appears (to me) to be what you're doing.

Geoff


 
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