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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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"Andrew Owen" <ao...@brandnewco.org> wrote in message

news:B54835DE.49F%aowen@brandnewco.org...

> in article 8ftndk$ne...@soap.pipex.net, Geoff Winkless at
> geoff-at-farmline-dot-...@127.0.0.1 wrote on 17/5/00 10:10 am:

> > 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.

> Just out of interest, which OUT exactly and how did it work?

Can't remember the exact details, but I _think_ there was a band of 16 OUTs
which corresponded to the 16 palette colours.

> > 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.

> How many SAMs are there out there, how many Spectrums? This idea will
start
> out as emulated hardware but I hope it will make it into a real hardware
> board that you can plug into a real machine.

Mmm. That was MGT's original idea too -- a board that plugged into a speccy.
Then they speeded up the processor, redesigned the BASIC, added in a new
sound chip, changed a few more bits and then thought, sod it, you've got so
much of a computer in here, you may as well go the whole hog...

that way lies madness...

To be honest the only real way to make it decent would be to up the speed of
the processor to 40MHz or something, that would make it capable of handling
a decent amount of reasonable quality graphics.

Geoff


 
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