Re: A85: ZShell to Usgard

To: assembly-85@lists.ticalc.org
Subject: Re: A85: ZShell to Usgard
From: Adam Geitgey <csrawebtech@qualityservice.com>
Date: Sun, 17 May 1998 20:03:58 +0100
Delivered-To: assembly-85-outgoing@towerguard.unix.edu.sollentuna.se
Organization: CSRA Web Design and Computer Consulting
References: <19980516.133407.9534.0.egillespie@juno.com> <19980517.181848.9758.0.nine1one@juno.com> <355f79ce.19777064@omega.uta.edu>
Reply-To: assembly-85@lists.ticalc.org


Michael Pearce wrote:
> 
> Yes you can make levels using bits like that, but i imagine most games
> use 1 byte for each tile.  you cannot read 1 bit from memory at a
> time.  you must read the entire byte.  you can then use the "bit"
> instruction to test an individual bit.  instructions such as "and" and
> "or" are also very useful.

In ff85 i used tiles that were nibble sized (4 bits) and I would read in
1 byte at a time and then chop it into two (using bitmask) and shift the
one witht he first 4 bits over.  The routine was tiny and fast, you
could do something like that.

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Follow-Ups:

Re: A85: ZShell to Usgard

From: egillespie@juno.com (Erik L Gillespie)

References:

A85: ZShell to Usgard

From: egillespie@juno.com (Erik L Gillespie)

Re: A85: ZShell to Usgard

From: nine1one@juno.com

Re: A85: ZShell to Usgard

From: mgp4007@omega.uta.edu (Michael Pearce)