Anachronaut
f4c78e68ba
Added DPUP and DPDN, which take a one byte operand specifying how far up or down to offset the Data Pointer. Three Fibonacci generators using the print.asm library. - 8 bit values printing in decimal representation. - 16 bit values printing in hexadecimal representation. - 32 bit values printing in hexadecimal representation.
133 lines
1.8 KiB
NASM
133 lines
1.8 KiB
NASM
; A Fibonacci number generating program that uses four bytes to store the value.
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#Include Libraries/print.asm
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#Program
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start:
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; Swap ValueB and ValueA.
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; First, store ValueA on the stack.
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SETD ValueA
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LDA
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PSHA
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INCD
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LDA
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PSHA
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INCD
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LDA
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PSHA
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INCD
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LDA
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PSHA
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; Next, store ValueB on the stack.
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SETD ValueB
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LDA
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PSHA
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INCD
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LDA
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PSHA
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INCD
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LDA
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PSHA
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INCD
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LDA
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PSHA
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; Then pop ValueB into ValueA.
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SETD ValueA
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INCD INCD INCD
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POPA
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STA
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DECD
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POPA
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STA
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DECD
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POPA
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STA
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DECD
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POPA
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STA
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; Then pop ValueA into ValueB.
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SETD ValueB
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INCD INCD INCD
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POPA
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STA
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DECD
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POPA
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STA
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DECD
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POPA
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STA
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DECD
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POPA
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STA
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; Print ValueA.
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SETD ValueA
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INCD INCD INCD
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LDA
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CALL printByteHex
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DECD
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LDA
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CALL printByteHex
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DECD
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LDA
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CALL printByteHex
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DECD
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LDA
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CALL printByteHex
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CALL blankSpace
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; Now add ValueA and ValueB, and store the result in ValueA.
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; Add the lowest bytes of ValueA and ValueB.
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SETD ValueB
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LDB
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SETD ValueA
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LDA
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ADD
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; Store it in ValueA's lowest byte.
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STQ
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; Add the second lowest bytes of ValueA and ValueB.
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SETD ValueB
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INCD
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LDB
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SETD ValueA
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INCD
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LDA
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ADD
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; Store it in ValueA's second lowest byte.
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STQ
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; Add the second highest bytes of ValueA and ValueB.
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SETD ValueB
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INCD INCD
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LDB
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SETD ValueA
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INCD INCD
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LDA
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ADD
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; Store it in ValueA's third lowest byte.
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STQ
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; Add the highest bytes of ValueA and ValueB.
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SETD ValueB
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INCD INCD INCD
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LDB
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SETD ValueA
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INCD INCD INCD
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LDA
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ADD
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; If this addition overflows, we're done.
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BRC end
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; Otherwise, store the result in ValueA's highest byte.
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STQ
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; And branch back to the beginning of the loop.
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BRI start
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end:
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CALL lineFeed
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HALT
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#Data
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ValueA:
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; Lowest byte ... Highest byte.
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0x01 0x00 0x00 0x00
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ValueB:
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; Lowest byte ... Highest byte.
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0x00 0x00 0x00 0x00
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