Resource centre for ZX Spectrum games
using Manic Miner and Jet Set Willy game engines
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Message: 3477
Author: Philip Bee
Date: 22/03/2003
Subject: Re: Manic Miner ZX81 'port' for Spectrum 128
--- In manicminerandjetsetwilly@yahoogroups.com, soa1000
>
The ZX81 was only designed to display 64 by 48 definable graphics.
> The graphics are rather, um, freeform. Are they supposed to be that
> distorted, or is the game allergic to ZX32?
However, one of the Z80's registers points to a font table. This can
be moved around in the ROM to create graphical effects.
Unfortunately, the design of the ZX81 makes it impossible for the
character set to be anywhere in the 16K range, so you can't have a
user defined set without extra hardware.
You can only have 128 different combinations out of the 256 possible
ones. These are the 64 'characters' and their inverses. So it's
really a pseudo hi-res graphics mode.
Pretty impressive all the same!
Regards,
Phil
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