* Cryptanalysis Problem (CLASSIFIED)
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* Cryptanalysis Problem (CLASSIFIED)
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a GREG
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a GREG
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b GREG
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b GREG
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c GREG
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c GREG
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t GREG
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t GREG
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x GREG
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x GREG
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y GREG
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y GREG
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LOC Data_Segment
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LOC Data_Segment
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count GREG @ Base address for wyde counts
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count GREG @ Base address for wyde counts
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LOC @+8*(1<<16) Space for the wyde frequencies
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LOC @+8*(1<<16) Space for the wyde frequencies
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freq GREG @ Base address for byte counts
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freq GREG @ Base address for byte counts
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LOC @+8*(1<<8) Space for the byte frequencies
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LOC @+8*(1<<8) Space for the byte frequencies
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p GREG @
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p GREG @
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BYTE "abracadabraa",0,"abc" Trivial test data
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BYTE "abracadabraa",0,"abc" Trivial test data
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ones GREG #0101010101010101
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ones GREG #0101010101010101
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LOC #100
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LOC #100
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2H SRU b,a,45 Isolate next wyde.
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2H SRU b,a,45 Isolate next wyde.
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LDO c,count,b Load old count.
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LDO c,count,b Load old count.
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INCL c,1
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INCL c,1
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STO c,count,b Store new count.
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STO c,count,b Store new count.
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SLU a,a,16 Delete one wyde.
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SLU a,a,16 Delete one wyde.
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PBNZ a,2B Done with octabyte? \bracetext...
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PBNZ a,2B Done with octabyte? \bracetext...
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Phase1 LDOU a,p,0 Start here: Fetch the next eight bytes.
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Phase1 LDOU a,p,0 Start here: Fetch the next eight bytes.
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INCL p,8
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INCL p,8
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BDIF t,ones,a Test if there's a zero byte.
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BDIF t,ones,a Test if there's a zero byte.
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PBZ t,2B Do main loop, unless near the end.
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PBZ t,2B Do main loop, unless near the end.
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2H SRU b,a,45 Isolate next wyde.
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2H SRU b,a,45 Isolate next wyde.
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LDO c,count,b Load old count.
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LDO c,count,b Load old count.
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INCL c,1
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INCL c,1
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STO c,count,b Store new count.
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STO c,count,b Store new count.
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SRU b,t,48
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SRU b,t,48
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SLU a,a,16
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SLU a,a,16
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BDIF t,ones,a
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BDIF t,ones,a
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PBZ b,2B Continue unless done.
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PBZ b,2B Continue unless done.
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Phase2 SET p,8*255 1
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Phase2 SET p,8*255 1
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1H SL a,p,8 255
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1H SL a,p,8 255
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LDA a,count,a 255 $\.a\gets{}$address of row \.p
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LDA a,count,a 255 $\.a\gets{}$address of row \.p
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SET b,8*255 255
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SET b,8*255 255
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LDO c,a,0 255
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LDO c,a,0 255
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SET t,p 255
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SET t,p 255
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2H INCL t,#800 255*255
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2H INCL t,#800 255*255
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LDO x,count,t 255*255 Element of column \.p
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LDO x,count,t 255*255 Element of column \.p
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LDO y,a,b 255*255 Element of row \.p
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LDO y,a,b 255*255 Element of row \.p
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ADD c,c,x 255*255
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ADD c,c,x 255*255
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ADD c,c,y 255*255
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ADD c,c,y 255*255
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SUB b,b,8 255*255
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SUB b,b,8 255*255
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PBP b,2B 255*255
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PBP b,2B 255*255
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STO c,freq,p 255
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STO c,freq,p 255
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SUB p,p,8 255
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SUB p,p,8 255
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PBP p,1B 255
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PBP p,1B 255
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POP
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POP
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Main IS Phase1
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Main IS Phase1
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