Extra Inning

Extra Inning
Developer: Midway Games Publisher: Midway Games Platform: Arcade (Midway 8080-based black and white hardware) Released in US: March 1978 This game has uncompiled source code.

Extra Inning is a simple baseball-type game. Ancient arcade action!

Source Code

A chunk of source code is present in ROM chip ei.b, uncompiled and commented:

BALLD EQU 50H ;BALL DIST FOR PITCH BPOS EQU 44 ;BAT ADDER SEC EQU 60 ; PORTS SAP EQU 1 ;SHIFT AMT SNDP EQU 3 ;SOUNDS SOP EQU 2 ;SHIFT DATA SIP EQU 3 ;SHIFT IN P2IP EQU 0 ;PLAYER 2 SETP EQU 2 ;OPERATOR SETTINGS P1IP EQU 1 ;PLAYER 1 MUP1 EQU 5 ; MUSIC PORT MUP2 EQU 6 ; """"" """" WDOG EQU 4 ;SOUNDS CCNTR EQU 30H GASND EQU 10H ; TIMES TBALL EQU SEC/8 ;BALL SOUND TIME THIT EQU SEC/60 ;HIT SOUND TIME TOUT EQU SEC ;OUT SOUND TIME TSTRK EQU SEC/2 ;STRIKE SOUND TIME TCRDC EQU 4*SEC ;CROWD SOUND TIME ; PLAYER POSITIONS XP1 EQU 0C8H YP1 EQU 50H XP2 EQU 0A0H YP2 EQU 2EH XP3 EQU 58H YP3 EQU YP2 XP4 EQU -XP1-8 AND 0FFH YP4 EQU YP1 XP5 EQU 81H YP5 EQU 7AH XPL EQU 20H YPL EQU 20H XPC EQU 80H YPC EQU 1 XPR EQU -XPL AND 0FFH YPR EQU YPL ; BASE POSITIONS XB1 EQU 0C9H YB1 EQU 75H XB2 EQU 81H YB2 EQU 3CH ; BALL TO POSITION XOFF EQU 4 ;X OFFSET FOR BALL YOFF EQU 3 ;Y OFFSET FOR BALL XBP1 EQU XP1-XOFF YBP1 EQU YP1+YOFF XBP2 EQU XP2-XOFF YBP2 EQU YP2+YOFF XBP3 EQU XP3-XOFF YBP3 EQU YP3+YOFF XBP4 EQU XP4-XOFF YBP4 EQU YP4+YOFF XBP5 EQU XP5-XOFF YBP5 EQU YP5+YOFF XBPL EQU XPL-XOFF YBPL EQU YPL+YOFF XBPC EQU XPC-XOFF YBPC EQU YPC+YOFF XBPR EQU XPR-XOFF YBPR EQU YPR+YOFF ; BALL POSITIONS XBB1 EQU XB1-XOFF YBB1 EQU YB1+YOFF XBB2 EQU XB2-XOFF YBB2 EQU YB2+YOFF XBB5 EQU XP5-XOFF YBB5 EQU YP5+YOFF ;

(Source: Original TCRF research)