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21-sawayama-wonderdisc-drive-controller

README.md

21: Sawayama Wonderdisc (Drive Controller)

Instructions

Modify your WonderDisc, which normally only plays SSEA region games, to play games from any region.

The SSEA region code is available in file 300.

It is not necessary to leave no trace. Your EXAs should be written to operate indefinitely.

For more information see "Hardware Hacks: Sawayama WonderDisc" in the second issue of the zine.

Solution

XA (global)

LINK 800

COPY 8 #AUTH
COPY 0 #AUTH
COPY 3 #AUTH
COPY 2 #AUTH
COPY 7 #AUTH
COPY 1 #AUTH
COPY 0 #AUTH
COPY 4 #AUTH
COPY 9 #AUTH
COPY 5 #AUTH
COPY 1 #AUTH
COPY 2 #AUTH
COPY 5 #AUTH
COPY 2 #AUTH
COPY 6 #AUTH

MARK READ_TRAK
COPY #TRAK T
LINK 801
GRAB T

MARK SEND
TEST EOF
TJMP END
COPY F M
JUMP SEND

MARK END
COPY -1 M
DROP
LINK -1
JUMP READ_TRAK

XB (local)

LINK 800

MARK START
MAKE

MARK COPY
COPY M X
TEST X = -1
TJMP END
COPY X F
JUMP COPY

MARK END
LINK 800
DROP
LINK -1
JUMP START

XC (local)

GRAB 300
LINK 800
JUMP RELAY

MARK REPLACE
SEEK -1
COPY F M

MARK RELAY
MODE
COPY M X
MODE
TEST X > -2
FJMP REPLACE
COPY X M
JUMP RELAY

Results

Cycles Size Activity
8294 58 124