Comments on: Request from a reader! (Updated!)

By: MagerValp

MagerValp — Fri, 10 Jul 2009 13:35:04 +0000

Excellent, glad to hear it got you going in the right direction.

Good luck with the remake!

By: George

George — Thu, 09 Jul 2009 01:47:48 +0000

Hi MagerValp and Marc,

I found this information very useful! It helped me understand how the data is stored. I wanted to figure out a way to read the original C64 disk images (in D64 format) and render the map using the C64 graphics/colours. All of the details you provided me were very helpful. I was able to find the tile information on the “program” disk. The first half of the tiles are at 0×16700 and the second are at 0×17700. The colours are at 0x130b0.

I wrote a little Java application to read the C64 disks and generate the map. My goal now is to work towards replicating as much of the original C64 game as possible.

Thanks!
George

By: MagerValp

MagerValp — Tue, 07 Jul 2009 12:01:42 +0000

So, reader who made the request, did that help or did you need something else?

By: wtf_dragon

wtf_dragon — Sat, 27 Jun 2009 20:35:14 +0000

Thanks for that, Mager Valp! I hope the reader who made the request finds this information useful!

By: MagerValp

MagerValp — Sat, 27 Jun 2009 13:10:29 +0000

You can find a bunch of information about U4 on the C64 under Tech info on my U4 Gold site:

http://www.paradroid.net/u4/

The tiles are stored in file 41, which loads at $b000-$cfff. They are stored in two halves, with the upper half of each tile at $b000-$bfff, and the lower half in $c000-$cfff. The tiles are in normal C64 bitmap format (1bpp, 8 bytes per cell, 40 cells per line). Color data is in file 4c, at $e1b0-$e2af.