Frogger (Magnavox Odyssey²)

A Magnavox Odyssey² port of the famous Arcade game about roadkill frogs.

Uncompiled Source Code#

The Brazilian version has fragments of source code at 1700 and 1E81.

1700#

       R0
MOV.A,#10H
MOVX.@R0,A
MOV.A,#0F9H
JMP.MODBB

NOLIST
ORG.800H

LOAD7:
MOV.A,R1
INC.R1
MOVP.A,@A
;MOV.R2,A
MOV.A,R1
INC.R1
MOVP.A,@A

;MOV.R0,A
W11:
MOV.A,R1
INC.R1

MOVP.A,@A
;MOVX.@R0,A
INC.R0
DJNZ.R2,W11
RET

1E81#

#YMOSCA

JMP.J41

ORG.900H

INICO:
MOV.R0,#78H
MOV.R1,#39H+9
CALL.TRANS
MOV.R0,#7CH
MOV.R1,#39H+9*4

TRANS:
MOV.R3,#2

W56:
MOVX.A,@R1
MOVX.@R0,A
INC.R0
INC.R1
DJNZ.R3,W56
INC.R1
MOVX.A,@R1
MOVX.@R0,A
RET

POEB0B:
MOVX.A,@R0
ADD.A,#-0A9H
JC.POEB0
RET

POEB0:
MOV.A,#0B0H
MOV.R3,#2

W50B:
MOVX.@R0,A
INC.R0
DJNZ.R3,W50B
INC.R0

References#