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Video (PC8801): Difference between revisions
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mNo edit summary |
(Background/foreground component toggle) |
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Line 18: | Line 18: | ||
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|0x52 | |0x52 | ||
| | |Background Color | ||
| | |Sets the background color of the screen. The color is an RGB composite. | ||
If bit 3 (mask 0x8) = blue on | |||
if bit 4 (mask 0x10) = green on | |||
If bit 5 (mask 0x20) = red on | |||
|- | |- | ||
|0x53 | |0x53 | ||
Line 26: | Line 29: | ||
|- | |- | ||
|0x54 | |0x54 | ||
| | |Toggle Background/Foreground color components | ||
| | |Toggles background and foreground color components on and off | ||
if 8-color mode { | |||
if bit 7 (mask 0x80) set, target is background color, else foreground | |||
if bit 6 (mask 0x40) toggle green component { | |||
GREEN ON if bits 1,2,3 (0x7) set, else OFF | |||
} | |||
else toggle red and/or blue { | |||
BLUE ON if bit 1,2,3 set, else OFF | |||
RED ON if value written / 8 sets bits 1,2,3, else OFF | |||
} | |||
} | |||
else if monochrome mode, set foreground color { | |||
BLUE ON if bit 1 set (mask 0x1) | |||
RED ON if bit 2 set (mask 0x2) | |||
GREEN ON if bit 3 set (mask 0x4) | |||
} | |||
|- | |- | ||
|0x55-0x5b | |0x55-0x5b |
Revision as of 22:15, 4 March 2016
Port | Name | Function |
0x30 | ||
0x34 | ||
0x35 | ||
0x52 | Background Color | Sets the background color of the screen. The color is an RGB composite.
If bit 3 (mask 0x8) = blue on if bit 4 (mask 0x10) = green on If bit 5 (mask 0x20) = red on |
0x53 | ||
0x54 | Toggle Background/Foreground color components | Toggles background and foreground color components on and off
if 8-color mode { if bit 7 (mask 0x80) set, target is background color, else foreground if bit 6 (mask 0x40) toggle green component { GREEN ON if bits 1,2,3 (0x7) set, else OFF } else toggle red and/or blue { BLUE ON if bit 1,2,3 set, else OFF RED ON if value written / 8 sets bits 1,2,3, else OFF } } else if monochrome mode, set foreground color { BLUE ON if bit 1 set (mask 0x1) RED ON if bit 2 set (mask 0x2) GREEN ON if bit 3 set (mask 0x4) } |
0x55-0x5b | Palette Write | Writes to the palette. The index written to is the difference between the port number and 0x54. |
0x5c-0x5f |