02/20/11 – See a picture of the 4in1 mod here
01/31/11 – See a video of the mod running here
01/30/10 – Publish v2.0 Menu Code here
01/30/10 – Publish v3.0 (Legacy versions can be found here) 05/02/10 – Publish v3.1 Fixed some navigation issues with the menu 05/09/10 – Publish v3.2 Fixed the Ms. Pac start issues and fixed cocktail mode
05/14/10 – Publish v3.3 Options only visible when service switch is on and improved navigation 07/19/10 - Publish v3.3 for Ms Pac Championship/Super Zola Pac Board here
New in Version 3
1. The mod fits in a 27c512 now (27c020 image included in zip also) 2. Additional ram is required (see High Score Save section) 3. Dip switch setting can be set (on screen) in the options menu
I am a big fan of multigame kits that run on original hardware. For my Pac-man I use Mike Doyle and Dave Widelís 96-in-1 kit
located at http://home.everestkc.net/mdoyle/multipac.htm. Like most collectors I come across a number of Pac-man boards
for projects and do not want to spend the mone for one of these kits for each of them. For these boards I use the free hack located at http://www.pinrepair.com/video/pacman.htm#hack1. This is a great quick hack for getting more than one version of Pac-man on a board. The only thing I donít like about this hack is the use of mechanical switches. Generally you need to run some wires from the Pac-man board to the coin door or some other reachable location. My goal when starting this project was to have this hack menu driven and eliminate the mechanical switches.
The first thing I needed to do was find somewhere on the Pac-man board I could control via code to replace the mechanical switches.
Looking through the many Pac-man resources on the internet I found that the latch at 8K has three outputs which it does not use.
The addressable latch at 8K that controls sound, flip and other things also has output for Start Lamp 1 (Pin 9), Start Lamp 2 (Pin 10)
and Coin Lockout (Pin 11). These pins can be turned on and off like switches and since Pac-man does not use start lamps or the coin
lock-out it is not taking anything away from the original game.
I realized after playing around with my theory that there was a problem. When Pac-man starts up it clears all the pins on the latch.
In fact it clears and sets them a few times during initialization. So, now I needed to go and modify the Pac-man and Ms. Pac-man
code to get rid of this step or the game will reset the first time the latch is cleared.
Next I needed a menu to drive the 4 games. My wife helped me design the menu (see below). It is nothing fancy but it will get the
job done. I am sure I will make modification to make it more fancy in the future but this is it for now.
At the moment there is a pretty simple screen saver in place. After about 5 minutes of no activity it clears the screen
and shows pac-man and the ghosts bouncing around the screen. I may add to this in the future, but it does the job. Any movement of the joystick or pressing of the buttons will bring you back to the menu screen.
High Score Save
Version 2.0 and up of this modification supports high score save for each game in thier own high score table. The high score is saved on an nvram that is wired on to the board. Version 3.0 and up of the mode will require additional ram to be added to the Pac board. You have 3 options: 1. Buy an nvram board (contact Slava Madrit at email@example.com or visit his KLOV profile here) you can see a picture of what the board looks like here and here 2. Wire up your own nvram adapter (details can be found here) 3. Piggyback two 2114 ram chips on 4K and 4N (pull up the select pins and tie them both to 5L pin 10)
On Screen Dip Settings
Version 3.0 and up now supports on screen dip switch settings. This means that you no longer need to go into the back of your game to change things like coinage, lives, bonus, etc. These can now be changed in the options menu. A note about alternate names: I am not sure what the initial intent of this setting was for. When active it changes the names of the ghosts to -AAAAAAAA- "BBBBBBBB" -CCCCCCCC- "DDDDDDD" ... and so on I imagine these were a place holder that was never used. Since there is no checksum in these roms you can use a hex editor to Change these names to anything you want before you burn the roms.
This is a modified copy of the hack from (http://www.marvin3m.com/video/pacman.htm#hack1) that uses one of the latches at 8k
instead of the mechanical switches.
74ls259 Pin (11) 0x8000
The row 6 EPROM has a new layout to include the menu and some other changes to the original Pac-man/Ms. Pac-man code. Pac-man and Ms. Pac-man have been modified to handle fast and slow versions in the same bank that is controlled by the menu. There was no need to take up two more banks of emprom space for a few bytes of code that were different.
Download bin files: 4n1_3_3.zip
00000 - 00FFF Pac-Man 6e
01000 - 01FFF Pac-Man 6f
02000 - 02FFF Pac-Man 6h
03000 - 03FFF Pac-Man 6j
04000 - 04FFF empty
05000 - 05FFF empty
06000 - 06FFF helper functions
07000 - 07FFF empty
08000 - 08FFF Ms. Pac-Man boot1
09000 - 09FFF Ms. Pac-Man boot2
0A000 - 0AFFF Ms. Pac-Man boot3
0B000 - 0BFFF Ms. Pac-Man boot4
0C000 - 0CFFF Ms. Pac-Man boot5
0D000 - 0DFFF Ms. Pac-Man boot6
0E000 - 0EFFF helper functions
0F000 - 0FFFF empty