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46 lines
1.1 KiB
Tal
46 lines
1.1 KiB
Tal
( Subleq:
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The subleq instruction subtracts the contents at address a
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from the contents at address b, stores the result at address b,
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and then, if the result is not positive, jumps to address c.
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If the result is positive, execution proceeds to the next instruction
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in sequence. )
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|0000
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@a $2 @b $2 @c $2
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|0100 ( -> ) @reset
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#0000
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&while
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,eval JSR
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DUP2 #8000 LTH2 ,&while JCN
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POP2
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( halt ) #010f DEO
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BRK
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@eval ( ip* -- ip* )
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DUP2 ,&get JSR .a STZ2
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INC2 DUP2 ,&get JSR .b STZ2
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INC2 DUP2 ,&get JSR .c STZ2
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INC2
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( I/O )
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.a LDZ2 #ffff EQU2 ,&input JCN
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.b LDZ2 #ffff EQU2 ,&output JCN
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( SUBLEQ )
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.b LDZ2 STH2k ,&get JSR .a LDZ2 ,&get JSR SUB2 STH2r #10 SFT2 ;program ADD2 STA2
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( SET )
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.b LDZ2 ,&get JSR #0001 SUB2 #8000 LTH2 ,&end JCN POP2 .c LDZ2 &end
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JMP2r
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&input ( -- ) JMP2r
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&output ( -- ) .a LDZ2 ,&get JSR NIP #18 DEO JMP2r
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&get ( a* -- b* ) #10 SFT2 ;program ADD2 LDA2 JMP2r
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@program ( hello world )
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000f 0011 ffff 0011 ffff ffff 0010 0001
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ffff 0010 0003 ffff 000f 000f 0000 0000
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ffff 0048 0065 006c 006c 006f 002c 0020
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0077 006f 0072 006c 0064 0021 000a 0000
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