Expanding Memory
It is possible to expand the memory to 128kB by adding 64kB of RAM to the cartridge. There are two open places on the PCB. When the RAM is added, both types of cartridges become identical. The cartridge will work with both the SD Snatcher and Snatcher video games.
Surprisingly enough, a cartridge with 128kB RAM can behave exactly like a SCC ROM cartridge of 128kB. This means you can load those games into the RAM (e.g. Gradius 2, F1 Spirit, Quarth and so on) and it will behave like the original ROM cartridge until the power is turned off, since it is volatile RAM. It is possible that this chip was originally developed for internal development and testing use at Konami.
The RAM ICs are of type 4464. They are four bits wide and a 64K range. There might still some solder in the holes, you can use a solder sucker for that.
If you would like the cartridge to work with both video games then you can also connect the memory banks (so they are mirrored). Connect CAS (pin 16 of RAM IC) of one of the RAM ICs with one of the empty slots.
Read more about this topic: Konami Sound Cartridge
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