Mappy Save High-Score
Mappy is one game that's never far from being plugged into one of my machines, simple gameplay with cute graphics make it great to play. It's also one game that both myself and my girlfriend play 'fairly' competetively :-) So keeping a record of those scores is important, even almost all of them are hers.
All the Mappy boards I've checked, about 6, all have socketed RAM, which certainly makes things easier. Here again you need a 48Z02 or a DS1220AB. Two ROMs also need to be replaced.
There appear to be two version of the Mappy ROMset around, you can tell the version by the title screen that introduces the characters, "Mappy' as Micro-police and the big cat, "boss the big bit" ( weird name I know ), anyway how to tell the versions:
The big cat, "Boss the big bit" is called
Version 1: GORO
Version 2: NYAMCO
So if you have version 1, download the version 'Goro' ROMs and version 2 download the
After playing both versions there doesnt actually seem to be any difference in gameplay.
1. Save high-score
Documentation of Modifications
Here is the breakdown of the code changes and the
modifications to the stock ROM ( this is only for the Midway release ).
All code is limited to the power-on-reset and self-test. Once booted the high-score save changes have no impact on the gameplay.
View the modifications to the original code
The image below shows the location of the ROM and RAM to be changed
Download Modified Program ROMs