17-digital-library-project-patron-access-system

17: Digital Library Project (Patron Access System)

Instructions

Books are stored in the host corresponding to the first digit of their call number, while a book's file ID is 200 plus the last two digits of the call number. For example, book 512 would be stored in the host 500-599 as file 212.

Duplicate each of the books requested by EMBER-2 and bring them back to your host.

The call numbers for the books EMBER-2 wants are available in file 300.

Note that EMBER-2 will never request more than one book from the same host.

Solution

XA (global)

MARK START
GRAB 300
SEEK M
TEST EOF
TJMP END
COPY 0 M
COPY F X
DROP
SWIZ X 003 T
LINK 800
MARK GO
LINK 800
SUBI T 1 T
TJMP GO
SWIZ X 021 T
ADDI T 200 T
GRAB T
MARK COPYBOOK
COPY F M
TEST EOF
FJMP COPYBOOK
DROP
COPY 0 M
SWIZ X 003 T
MARK RETURN
LINK -1
SUBI T 1 T
TJMP RETURN
LINK -1
JUMP START
MARK END
COPY 1 M
HALT

XB (global)

COPY 0 X
MARK START
COPY X M
TEST M = 1
TJMP END
MAKE
MARK FILECOPY
COPY M T
FJMP COPY
COPY T F
TJMP FILECOPY
MARK COPY
DROP
ADDI X 1 X
JUMP START
MARK END
HALT

Results

Cycles	Size	Activity
1312	50	74