Resource centre for ZX Spectrum games
using Manic Miner and Jet Set Willy game engines
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Message: 4415
Author: john_elliott_uk
Date: 23/08/2004
Subject: Re: Comments from Geoff Eddy re. Patch Vectors
--- In manicminerandjetsetwilly@yahoogroups.com, "Alexandra"
> I was using a TAP. If I used seperated files I'd get confused as to
there's
> what *actual* spectrum address I was editing. Though I guess
> probably an easy way of working out where the address of room N's
If you want to put code in a room definition, then (with +3DOS
> patch is.
files) you use this formula:
rooms.js1: Rooms 0 to 31 (V,W); 0 to 15 (others)
rooms.js3: Rooms 32 to 63 (V,w); 16 to 31 (others)
rooms.js4: Rooms 64 to 95 (V,W); 32 to 47 (others)
rooms.js6: Rooms 96 to 127 (V,W); 48 to 63 (others)
In a V/W game, the rooms are than at 80h, 280h, 480h, 680h...
while in the others, the rooms are at 80h, 480h, 880h, 0C80h...
The current room will always be at Spectrum address 8000h, whatever
the game format. So in a V-format game, your patch vector code will
(probably) start at 8100h.
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