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Text File  |  1998-10-24  |  5KB  |  88 lines
  1. DESKTOP ⑧x1k1                                חללללללללללללללללל†
  2.                                 ´     BLITTER     ´
  3.                                 ´ bit assignments ´
  4.                                 זללללללללללללללללל¶
  5.                                  Atari BLock bIT TransfERrer processor
  6.                                  (optional)
  7.              םגגגגגגגגגגגגגגגגגג™
  8.              ø Control Register ø    b15=busy
  9.              ø                  ø        0:nothing
  10.              ø                  ø        1:busy
  11.              ø                  ø    b14=share the bus with MC68000
  12.              ø                  ø        0:yes , 64~ each
  13.              ø                  ø        1:no
  14.              ø                  ø    b13=source indicates next pattern line
  15.              ø                  ø        0:no
  16.              ø                  ø        1:yes
  17.              ø                  ø b11-b8=[b3-b0]=next pattern line
  18.              ø                  ø     b7=source read at begin of the line
  19.              ø                  ø        0:no
  20.              ø                  ø        1:yes
  21.              ø                  ø     b6=source read at end of the line
  22.              ø                  ø        0:yes
  23.              ø                  ø        1:no
  24.              ø                  ø  b3-b0=source shift in bits
  25.              ijגגגגגגגגגגגגגגגגגגך
  26.            םגגגגגגגגגגגגגגגגגגגג™
  27.            ø Operation Register ø  b9-b8=source type
  28.            ø                    ø       0:1
  29.            ø                    ø       1:pattern
  30.            ø                    ø       2:source
  31.            ø                    ø       3:source and pattern
  32.            ø                    ø  b3-b0=logical operation
  33.            ø                    ø         0: d =   0
  34.            ø                    ø         1: d = s . d
  35.            ø                    ø         2: d = s . d∙
  36.            ø                    ø         3: d =   s
  37.            ø                    ø         4: d = s∙. d
  38.            ø                    ø         5: d =   d
  39.            ø                    ø         6: d = s ± d
  40.            ø                    ø         7: d = s + d
  41.            ø                    ø         8: d =(s + d)∙   = s∙. d∙
  42.            ø                    ø         9: d =(s ± d)∙
  43.            ø                    ø        10: d =   d∙
  44.            ø                    ø        11: d =(s∙. d)∙   = s + d∙
  45.            ø                    ø        12: d =   s∙
  46.            ø                    ø        13: d =(s . d∙)∙  = s∙+ d
  47.            ø                    ø        14: d =(s . d)∙   = s∙+ d∙
  48.            ø                    ø        15: d =   1
  49.            ijגגגגגגגגגגגגגגגגגגגגך
  50.                םגגגגגגגגגגגגגגגג™
  51.                ø Source Address ø[b23-b0]=source address
  52.                ijגגגגגגגגגגגגגגגגך
  53.           םגגגגגגגגגגגגגגגגגגגגג™
  54.           ø Destination Address ø[b23-b0]=destination address
  55.           ijגגגגגגגגגגגגגגגגגגגגגך
  56.            םגגגגגגגגגגגגגגגגגגגג™
  57.            ø Horizontal Counter ø b15-b0=destination horizontal counter
  58.            ø                    ø                           (in words , 0:65536)
  59.            ijגגגגגגגגגגגגגגגגגגגגך
  60.              םגגגגגגגגגגגגגגגגגג™
  61.              ø Vertical Counter ø b15-b0=destination vertical counter
  62.              ø                  ø                           (in lines , 0:65536)
  63.              ijגגגגגגגגגגגגגגגגגגך
  64.   םגגגגגגגגגגגגגגגגגגגגגגגגגגגגג™
  65.   ø Source Horizontal Increment ø b15-b0=source horizontal signed increment
  66.   ijגגגגגגגגגגגגגגגגגגגגגגגגגגגגגך
  67.     םגגגגגגגגגגגגגגגגגגגגגגגגגגג™
  68.     ø Source Vertical Increment ø b15-b0=source vertical signed increment
  69.     ijגגגגגגגגגגגגגגגגגגגגגגגגגגגך
  70.    םגגגגגגגגגגגגגגגגגגגגגגגגגגגג™
  71.    ø Destination Hor. Increment ø b15-b0=destination horizontal signed increment
  72.    ijגגגגגגגגגגגגגגגגגגגגגגגגגגגגך
  73.   םגגגגגגגגגגגגגגגגגגגגגגגגגגגגג™
  74.   ø Destination Vert. Increment ø b15-b0=destination vertical signed increment
  75.   ijגגגגגגגגגגגגגגגגגגגגגגגגגגגגגך
  76.                םגגגגגגגגגגגגגגגג™
  77.                ø Beginning Mask ø b15-b0=beginning mask
  78.                ijגגגגגגגגגגגגגגגגך
  79.                   םגגגגגגגגגגגגג™
  80.                   ø Middle Mask ø b15-b0=middle mask
  81.                   ijגגגגגגגגגגגגגך
  82.                   םגגגגגגגגגגגגג™
  83.                   ø Ending Mask ø b15-b0=ending mask
  84.                   ijגגגגגגגגגגגגגך
  85.                  םגגגגגגגגגגגגגג™
  86.                  ø Pattern Line ø b15-b0=pattern line
  87.                  ijגגגגגגגגגגגגגגך
  88.