I wrote a lot of 4k games back then. Somewhere I had seen rogue, and I kept re-writing the game. Adding features and makeing the graphics better. Then out comes the Commodore 64. Had to have one. I went nuts editing the character set. Pissed off my dad one day when he turned the unit on. He could not get into the basic OS. I had a prototype cartridge plugged in for this rogue like game. I did the ROM burn and the board myself. (don't tell IBM! I used a friends lab) Anyway, I was in Ottawa partying that weekend, so he could not do his business reports; he did not know about the cartridge.