Labels:text | diagram | plan | technical drawing | schematic | font | black and white OCR: Barrel Shifter Function Start Address GR3, 63,4 CRTC reg C&D - CPU Write CPU Write 8 CPU Read Data 00-7 ALU 1sb I N/A-O None, AND 8 OR, XOR Bit *00-0 Mask Display Data Rotate GR8 Memory Q Latch GR3, 60-3 Address-7 16 * Set/Reset 0 GRO, 60-3 Enable Set/Reset 0 GR1, 60-3 Write Mode 8 8 GR5, 60,1 + CPU Read Plane 1 Latch - Data 00-7 EGA Functional Diagram Plane 2 Latch by Bob Montgomery Orlando, Florida Plane 3 Latch- 12-1-87 * Color Compare 0 8 8 GR2, 60-3 8 * Color Don't Care 0 -> GR7, 60-3 Data from Plane 1 Read Map: *= >Extend bit to byte. Data from Plane GR4, 60-2 Data from Plane 3 Read Mode GR=Graphics Register (3CE, 3CF). Read Map=n selects plane n for reading. Each bit gated GR5, 63 Color Don't Care bit n=0 makes color compare ignore plane n. Bit Mask passes Latch data where bits are ...
