18-tec-exa-blaster-modem-radio-stations

18: TEC EXA-Blaster Modem (Radio Stations)

Instructions

Connect to each radio station and replace every song in the playlist (file 200) with ‗CAN'T (NOT) GET OVER YOU‗ by ‗ME2U‗ (file 300). Each song in a playlist consists of two keywords: the song name and the artist name.

A list of phone numbers for the radio stations is available in file 301.

Note that EXAs in global mode can only communicate if there is a path of links connecting them.

For more information see "Hacker Skills: Modem Control at the Direct Level" in the second issue of the zine.

Solution

XA (global)

LINK 800
MARK DIAL
COPY M X
TEST X = -1
TJMP STATION
TEST X = -2
TJMP END
COPY X #DIAL
JUMP DIAL
MARK STATION
LINK 800
GRAB 200
MARK REPLACE
TEST EOF
TJMP ELSEWHERE
COPY 1 M
COPY M F
COPY M F
JUMP REPLACE
MARK ELSEWHERE
COPY -1 M
DROP
LINK -1
COPY -1 #DIAL
JUMP DIAL
MARK END

XB (global)

MARK READLINE
GRAB 301
MODE
COPY 1 M
COPY M X
MODE
MULI X 11 X
SEEK X
TEST EOF
TJMP END
COPY 11 T
MARK READNM
COPY F M
SUBI T 1 T
TJMP READNM
COPY -1 M
DROP
GRAB 300
MARK READSONG
TEST M = 1
FJMP GOBACK
COPY F M
COPY F M 
SEEK -2
JUMP READSONG
MARK GOBACK
DROP
JUMP READLINE
MARK END
COPY -2 M
MODE
COPY 2 M
HALT

XC (local)

COPY 0 X
MARK ASDF
TEST M = 1
FJMP END
COPY X M
ADDI X 1 X
JUMP ASDF
MARK END
HALT

Results

Cycles	Size	Activity
1513	68	17