While producing the limited edition of A-VCS-tec Challenge I pondered about the next game project and thought that a game for either one or two players simultaneously would be nice. I already programmed some small demo effects - one of them being a rotating chessboard tube. The demo effects form the intro of Raster Fahndung now and the chessboard lead to the idee of searching for small patterns inside a board with a big pattern. I considered if such a game would be possible on the Atari 2600, because the limited RAM of only 128 bytes would have direct influence on the size of the pattern. When the main display routine proved to be possible all the game elements were added aswell as the one or two players option.
The game title itself is a german description of the game's objective: to search for a
specific pattern, but notmally it's used by the police. The expression "Rasterfahndung" itself
was the german "bad word of the year 1980" and may be translated to "dragnet investigation".
As 1980 was about the time of the Atari VCS being strong, I concidered this title being perfect.
The cartridge starts up with displaying the bouncing game logo and two rotating chessboard tubes.
After some seconds the cartridge displays the copyright information along with a conversion of my "Denker2000" picture which I first drew some years ago on the C64.
In the intro you can choose to play a one or two players game by either pressing fire of joystick one or joystick two. The one player game starts with a random board and your cursor located in the middle. Above the board is a countdown timer and the player's score is shown below the board.
Pressing the fire button of your joystick shows the pattern which you have to find inside the board.
Releasing the fire button brings you back to the board where you have to search for the pattern. Pressing the fire button at the right position awards you with the remaining time as points and the next level. Pressing the button at a wrong position shows the small pattern again.
The game ends when the time counter runs to 00. To make things a bit more difficult, the
time counter runs faster when the small pattern is displayed.
If you chose the two players game in the intro, the game starts with two different cursors inside the board and individual scores for each player.
The objective is the same as in the one player game: look at the pattern and search for it inside the game board. Both players can watch the small pattern individually, but remember that the time runs faster when the small pattern is shown.
Releasing the fire button brings you back to the board where you have to search for the pattern. Pressing the fire button at the right position awards the winning player with one point and the game continues with the next level. Pressing the button on a wrong position shows the small pattern again.
The game ends when either the time counter runs to 00 or one of the players manages to reach 9
points. To make things a bit more difficult, the time counter runs faster when the small pattern is displayed. It runs even faster if both players press the fire button at the same time.
The game is written in 6507 assembly and consists of 4 KB (4096 Bytes) of coding, graphics and sound effects. The VCS only offers 128 bytes of RAM of which 80 Bytes are used for the random playfield alone. The remaining space is needed for the position coordinates of the players, the scores, the timer, the small pattern and some technical information. Creating the excerpt of the small pattern from the random playfield uses a lot of bit shifting due to the complex way the Atari handles its display - every second value is stored with the bits in reversed order for example.
Due to differences between PAL- and NTSC-consoles, the game needs to be adjusted to both TV-standards. The first development version was PAL format (312 scanlines, 50 Hz) and converted to NTSC (262 scanlines, 60 Hz) afterwards.
The development was performed on a Pentium-PC
using a normal Text-Pad as editor and DASM V2.12 as compiler.
Testing was done using the emulator z26 V1.52 and V1.58.
The game is released as a limited edition of 75 copies first. The limited edition contains these items: PAL/NTSC-cartridge, plastic box, instruction manual, photo print, serialnumber and signature. Every limited edition cartridge contains a switch on the back of the cartridge to choose PAL or NTSC mode.
Beneath the limited edition of 75 copies, the unlimited run (normal cartridge and manual only) will supply as many copies as requested. Please order your copy of the unlimited edition game cartridge (PAL or NTSC) with manual directly from this retailer:
RasterFahndung is currently on sale through this site. The price for the limited edition is
35 EURO. Shipping is not included in the games prices and varies from your location and the kind of shipment you want.
25 EURO including worldwide postage.
Payment is accepted through Paypal, bank-transfer or cash (USD or EUR) in envelope (I recommend using insured envelopes only). Germans should pay by bank-transfer only. In any case the buyer takes the risk of the shipment.
All items have been tested by me personally and I ship them in perfect working condition. Anyway I will not take any responsibility for damages appearing on your consoles or cartridges in usage. I'm not able to replace or refund any of the games.
|ATTENTION PLEASE! Even if I tested all cartridges on different machines, there seem to be problems with some models of the VCS or 7800 consoles where the cart will not fit into the slot. I only used original Atari cartridges so I wonder where the problems come from.|
However: the cartridges always work on 2600junior consoles, so please make sure that you have such a machine before ordering. It may also work on your other machines, too.
|08||Kai Darius Kohl||USA|
|44||Marco Kerstens||The Netherlands|
|48||Mr. Atari||The Netherlands|
|68||Russ Perry jr.||USA|