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73 lines
3.1 KiB
Plaintext
73 lines
3.1 KiB
Plaintext
'''OUT''' writes values to register or port hardware addresses. '''QB64 currently has limited access to registers!'''
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{{PageSyntax}}
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:: OUT address%, value%
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* The ''address'' is an integer value expressed as decimal or Hexadecimal.
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* '''WARNING!''' Be sure that the address is useable. OUT accesses directly unlike [[POKE]] and can cause permanent PC damage!
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* Values sent are normally only 0 to 255 per one byte register(8 bits) address.
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* [[_PALETTECOLOR]] can also be used to set RGB intensity values using [[_RGB32|32 bit color]] values.
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:::::::'''Color Port access using OUT'''
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:::::OUT &H3C7, attribute : Set port to read RGB settings
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:::::OUT &H3C8, attribute : Set port to write RGB settings
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:::::OUT &H3C9, color_intensity : Writes settings
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:::::[[INP]] &H3C9, color_intensity : Reads settings
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::::* Every 3 reads or writes, changes to next color attribute
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::::* Color setting is Red, Green and Blue intensities in order
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::::* Color attribute intensity values range from 0 to 63 only
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::::* Some [[DAC]] color attribute intensities cannot be changed using OUT.
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''Example 1:'' Reading the default RGB color settings of color attribute 15.
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{{CodeStart}} '' ''
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{{Cl|OUT}} &H3C7, 15 'set color port attribute 15 for a read
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red% = {{Cl|INP}}(&H3C9)
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green% = INP(&H3C9)
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blue% = INP(&H3C9)
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PRINT red%, green%, blue% '' ''
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{{CodeEnd}}
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{{OutputStart}}
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63 63 63
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{{OutputEnd}}
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''Example 2:'' Changing the color intensity settings of the [[SCREEN]] background [[COLOR]] 0 to bright white.
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{{CodeStart}} '' ''
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{{Cl|OUT}} &H3C8, 0
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{{Cl|OUT}} &H3C9, 63 'red
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{{Cl|OUT}} &H3C9, 63 'green
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{{Cl|OUT}} &H3C9, 63 'blue '' ''
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{{CodeEnd}}
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:''Explanation:'' In [[SCREEN]] 0 this is one way to make high intensity background colors. [[COLOR]] ,15 is actually grey(7).
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''Example 3:'' Restoring colors to a bitmap from the Red, Green and Blue [[BSAVE]]d indexed array of color values.
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{{CodeStart}} '' ''
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{{Cl|SCREEN (statement)|SCREEN}} 12
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{{Cl|OUT}} {{Cl|&H}}3C8, 0 ' set color port for output at attribute 0
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{{Cl|FOR...NEXT|FOR}} i = 0 {{Cl|TO}} 47 ' 48 RGB values is (3 * 16) -1 color attributes from 0 in screen 12
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{{Cl|OUT}} {{Cl|&H}}3C9, Image%(i) ' changes to next attribute after 3 RGB loops
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{{Cl|NEXT}}
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{{Cl|PUT (graphics statement)|PUT}}(clm, row), Image(48) PSET '' ''
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{{CodeEnd}}
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:''Explanation:'' The color RGB intensity settings were imported from a file to the Image array using {{KW|BLOAD}}. The color attribute advances to the next one every 3 writes using OUT. The color information was indexed to the start of the array. The image is after the color settings at index 48. Index 48 is the [[GET (graphics statement)|GET]] image width and 49 is the height.
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''See also:''
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* [[INP]] {{text|(read register)}}, [[POKE]] {{text|(write to memory)}}
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* [[PALETTE]], [[COLOR]], [[SCREEN]]
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* [[BSAVE]], [[BLOAD]]
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* [[_PALETTECOLOR]]
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* [[Port Access Libraries]] {{text|(COM or LPT registers)}}
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* [http://en.wikipedia.org/wiki/Input/output_base_address#Common_I.2FO_base_address_device_assignments_in_IBM_PC_compatible_computers PC I/O base address device assignments]
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{{PageNavigation}} |