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Message: 4426

Author: andrewbroad

Date: 29/08/2004

Subject: Re: Adjusting horizontal guardians in MMtoJSW

 

john_elliott_uk wrote:

- HGs which go left initially start (on the zeroth time-frame) on
Sprite 0 rather than Sprite 3. SPECSAISIE MMtoJSW moves their
start-columns one character to the right.

Interesting. In MM "The Cold Room", the two guardians are

0e 72 5c 60 07 61 72
0d bd 5d 68 07 ac bd

and in JSW:MM they are

01 e6 13 30 00 ** 01 12
01 e5 1d d0 00 ** 0c 1d

- which looks to me as if the first one has been moved right
(from X=12h to X=13h) but the second hasn't. Did you do this
correction by hand in JSW:MM?

When SPECSAISIE MMtoJSW converts a horizontal guardian, the
following code sets the start-column:

byte startColumn= (byte)(_memoryMM.peekU(radm+h+1) & 31);
if (_memoryMM.peekU(radm+h+4) >= 4) { // initially goes left
startColumn++;
}
_memoryJSW.poke(radj+g++, startColumn);

Both penguins in "The Cold Room" go left initially, so MMtoJSW
set both their start-columns as per the code above.

However, this caused an infinite-death scenario when coming back
from "The Menagerie", so I decided to prioritise fairness over
faithfulness by manually moving the start-column of the lower
penguin one character to the left.

--
Dr. Andrew Broad
http://www.geocities.com/andrewbroad/
http://www.geocities.com/andrewbroad/spectrum/
http://www.geocities.com/andrewbroad/spectrum/willy/

 

 

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