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- The PC Vision plus is a framegrabber card.
-
- base+0 (R/W): Control register
- bit 0 Zoom. If set pixels are doubled when displayed.
- 1 Gain Adjust Enable.
- If clear the Gain will be incremented or decremented
- (depending on the DIR flag in bit 3) by writes to the Gain and
- Offset Counter (base+4), if set the Gain is fixed.
- 2 Offset Adjust Enable.
- If clear the Offset Voltage will be incremented or decremented
- (depending on the DIR flag in bit 3) by writes to the Gain and
- Offset Counter (base+4), if set the Offset Voltage is fixed.
- 3 Adjust Direction Control.
- If set writes to the Gain and Offset Counter (base+4)
- will increment the Gain and Offset counters if the appropriate bits
- (bit 1 and 2) are clear.
- 4 Board Select. If set the frame buffer is mapped into PC memory.
- 5-7 Page select. Selects which of 8 64k pages are mapped in.
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- base+1 (R/W): Lut Control Register
- bit 0-1 Look-Up Table Mode. Selects one of 4 Look Up Table banks
- for manipulation.
- 0= Red LUT, 1= Green LUT, 2= Blue LUT, 3= Input LUT.
- 2-4 Input Lut Select. Selects one of 8 Input LUTs
- 5-7 Output Lut Select. Selects one of 8 LUTs for each color.
-
- base+2 (R/W): Lut Address Register
- bit 0-7 Offset into the LUT selected by the Lut Control Register (base+1).
- Reads and writes to the LUT Data Port (base+3) will go to this entry.
-
- base+3 (R/W): Lut Data Port
- bit 0-7 This port directly accesses the offset selected by the Lut Address
- Register (base+2) in the LUT selected by the Lut Control Register
- (base+1).
-
- base+4 (W): Gain and Offset Counter
- bit 0-7 Each write to this register will increment or decrement (depending on
- the Direction flag in bit 3 of base+4) the Gain and Offset Voltage
- Counters if Adjust is enabled (base+4 bit 1 and 2).
-
- base+5 (R/W): Acquire and Status register
- bit 0 Video Input Select. If set video input is taken from Channel 1,
- else from Channel 0.
- 1 Clock Source Select. If set clock source is a Phase-Locked Loop,
- else a Crystal Oscillator.
- 2 (R) Odd/Even Status. Odd field displayed if set.
- 3 (R) Last Field Status. If clear the PCVISION plus is acquiring
- the last field of a grab.
- 4 (R) Vertical Blank Status.
- Vertical Blank active if clear (1.4ms).
- 5 (R) Horizontal Blank Status.
- Horizontal blank active if clear (12.7us).
- 6-7 Acquire Mode.
- 0: Freeze. Terminate operation.
- 1: Clear. Clear video memory.
- 2: Snap. Acquire a single image.
- 3: Grab. Continuously acquire images.
- When read 0 indicates the system is not busy.
-
- base+6 (R/W): Pan Register
- base+7 (R/W): Scroll Register
- base+8 (R/W): Memory Access Control Register
- base+9 (R/W): Host Mask Register
- bit 0-7 Each bit set prevents the corresponding bit plane from changes
- during host access and clear operations.
-
- base+Ah (R/W): Video Mask Register
- bit 0-7 Each bit set prevents the corresponding bit plane from changes
- during acquire operations.
-
- base+Bh (R/W): Pixel Buffer Register
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