TEMPEST ------- HEX R/W D7 D6 D5 D4 D3 D2 D2 D0 function 0000-7FFF R/W D D D D D D D D program ram (2K) 0800-080F W D D D D Colour ram 0C00 R D Right coin sw 0C00 R D Center coin sw 0C00 R D Left coin sw 0C00 R D Slam sw 0C00 R D Self test sw 0C00 R D Diagnostic step sw 0C00 R D Halt 0C00 R D 3khz ?? 0D00 R D D D D D D D D option switches 0E00 R D D D D D D D D option switches 2000-2FFF R/W D D D D D D D D Vector Ram (4K) 3000-3FFF R D D D D D D D D Vector Rom (4K) 4000 W D Right coin counter 4000 W D left coin counter 4000 W D Video invert - x 4000 W D Video invert - y 4800 W Vector generator GO 5000 W WD clear 5800 W Vect gen reset 6000-603F W D D D D D D D D EAROM write 6040 W D D D D D D D D EAROM control 6040 R D Mathbox status 6050 R D D D D D D D D EAROM read 6060 R D D D D D D D D Mathbox read 6070 R D D D D D D D D Mathbox read 6080-609F W D D D D D D D D Mathbox start 60C0-60CF R/W D D D D D D D D Custom audio chip 1 60D0-60DF R/W D D D D D D D D Custom audio chip 2 60E0 R D one player start LED 60E0 R D two player start LED 60E0 R D FLIP 9000-DFFF R D D D D D D D D Program ROM (20K) notes: program ram decode may be incorrect, but it appears like this on the schematics, and the troubleshooting guide. ZAP1,FIRE1,FIRE2,ZAP2 go to pokey2 , bits 3,and 4 (depending on state of FLIP) player1 start, player2 start are pokey2 , bits 5 and 6 encoder wheel goes to pokey1 bits 0-3 pokey1, bit4 is cocktail detect