Programmed by ComradeOJ
PCB by Helder
This Cartridge will allow you to test your SEGA GENESIS For failures on the motherboard. Specifically testing the RAM, CPU, VDP, and sound.
John Riggs and Colin from This Does Not Compute both did excellent videos about this cartridge, Feel free to check out those videos.
This Cartridge also has a HEX editor to allow you to edit the code of the SEGA GENESIS
The Hex Editor
The Hex Editor writes any given data value to any given address.
Say you wanted to enable the shadow/highlight mode of the Genesis.
You can also slowly input machine code and press A+B+C to execute it.On the cartridge, the page right after the hex writer has some other suggestions too.
On this page you will find a memory map of the genesis
There’s also a CPU register
The 68K has separate registers for data (numbers) and addresses (places). There is also a status register which can be used to enable/disable interrupts, and holds the output of comparison instructions.