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   1         .title  Assembler Link Test Constants
   2
   3         .module tconst
   4
   5         .area   TEST    (ABS,OVR)
   6
   7         bra1    ==      0       ; branching constants
   8         bra2    ==      0x80
   9         bra3    ==      0x182
  10         bra4    ==      0x204
  11
  12         .blkb   0x7E            ;bra1:
  13         .blkb   0x02
  14         .blkb   0x7F            ;bra2:
  15         .blkb   0x02
  16         .blkb   0x02
  17         .blkb   0x7F
  18         .blkb   0x00            ;bra3:
  19         .blkb   0x02
  20         .blkb   0x80
  21         .blkb   0x00            ;bra4:
  22
  23         .globl  bra5,bra6,bra7,bra8
  24
  25                                 ; branching labels
  26 bra5:   .blkb   0x7E            ;bra5:
  27         .blkb   0x02
  28 bra6:   .blkb   0x7F            ;bra6:
  29         .blkb   0x02
  30         .blkb   0x02
  31         .blkb   0x7F
  32 bra7:   .blkb   0x00            ;bra7:
  33         .blkb   0x02
  34         .blkb   0x80
  35 bra8:   .blkb   0x00            ;bra8:
  36
  37
  38         ; 12-Bit numbers are considered valid if:
  39         ;   1) the most significant 4 bits of the 16-bit number are zero
  40         ;   2) the most significant 4 bits of the 16-bit number are all ones
  41
  42         n0FFF   ==      0x0FFF  ;largest positive
  43         n1000   ==      0x1000  ;+1
  44
  45         nF000   ==      0xF000  ;largest negative
  46         nEFFF   ==      0xEFFF  ;-1
  47
  48
  49         .area   DIRECT  (ABS,OVR)
  50         .setdp
  51
  52         boundary        ==      0x101
  53
  54         minus1  ==      -1      ; paging / indexing constants
  55         zero    ==      0
  56         two55   ==      0d255
  57         two56   ==      0d256
  58         five11  ==      0d511
  59         five12  ==      0d512
  60
  61
  62         .globl  lzero,ltwo55,ltwo56,lminus1
  63
  64 lzero:  .blkb   0x00FF          ; paging labels
  65 ltwo55: .blkb   0x0001
  66 ltwo56: .blkb   0xFEFF
  67 lminus1:.blkb   0d0000
  68