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117 lines
2.1 KiB
NASM
117 lines
2.1 KiB
NASM
;some hardware constants C_[n]<DecimalValue>, 'n' indicates negative value
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;
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;these are in 2's complement representation
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C_0 equ $040 ;;00000000
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C_1 equ $041 ;;00000001
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C_2 equ $042 ;;00000002
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C_3 equ $043 ;;00000003
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C_4 equ $044 ;;00000004
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C_8 equ $045 ;;00000008
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C_16 equ $046 ;;00000010
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C_32 equ $047 ;;00000020
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C_256 equ $048 ;;00000100
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C_65536 equ $049 ;;00010000
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C_2^23 equ $04A ;;00080000
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C_2^28 equ $04b ;;10000000
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C_2^29 equ $04c ;;20000000 (C_max /4) +1
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C_2^30 equ $04d ;;40000000 ( C_max / 2 ) + 1 (almost half)
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C_nmax equ $04e ;;80000000 most negative number
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C_max equ $04f ;;7fffffff most positive number
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C_n1 equ $050 ;;ffffffff -1
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C_n2 equ $051 ;;fffffffe -2
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C_n2^30 equ $052 ;;c0000000 C_nmax /2
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C_LSshift equ $55 ;;to left shift an address by using macsints
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;;for fractional addresses
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ZERO equ C_0;
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ONE equ C_1;
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;;; Hardware Registers:
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ACCUM equ $56
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CCR equ $57
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NOISE1 equ $58
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NOISE2 equ $59
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IRQ equ $5A
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DBAC equ $5B
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and macro dest,srcA,srcB
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andxor dest,srcA,srcB,C_0
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endm
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xor macro dest,srcA,srcB
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andxor dest,C_n1,srcA,srcB
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endm
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not macro dest,src
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andxor dest,src,C_n1,C_n1
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endm
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nand macro dest,srcA,srcB
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andxor dest,srcA,srcB,C_n1
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endm
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or macro dest,srcA,srcB
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not C_0,srcA
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andxor dest,ACCUM,srcA,srcB
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endm
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nor macro dest,srcA,scrB
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not dest,srcA
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andxor dest,srcB,dest,srcA
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not dest,dest
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endm
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neg macro dest,src
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macs1 dest,C_0,C_1,C_nmax
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endm
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;;; branch on:
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;;; ==0
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beq macro count
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skip CCR,CCR,C_8,count
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endm
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;;; !=0
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bne macro count
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skip CCR,CCR,C_256,count
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endm
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;;; <0
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blt macro count
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skip CCR,CCR,C_4,count
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endm
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;;; always branch
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bra macro count
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skip C_0,C_max,C_max,count
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endm
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;;; on saturation
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bsa macro count
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skip CCR,CCR,C_16,count
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endm
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bge macro count
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C___80 con $80
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skip CCR,CCR,C___80,count
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endm
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bgt macro count
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C___180 con $180
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skip CCR,CCR,C___180,count
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endm
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move macro dest,src
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macs dest,src,C_0,C_0
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endm
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end
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;;; usefull for testing values before a skip
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test macro test
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macs C_0,test,C_0,C_0
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endm
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cmp macro src1.scr2
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macints C_0,src1,C_n1,src2
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endm
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