Alternate scan lines are stored in separate blocks. Even scan lines are stored in a block of 8000 bytes at the beginning of the frame buffer. Odd scan lines are stored at an offset of 8192 bytes into the buffer. Scan lines are fixed at 40 words in length.
The ChrH and ChrW registers determine the size of the character. The DstPtr register-pair specifies the word containing the upper- leftmost pixel of the character. The DstBitOff register specifies an offset into that word to locate the upper-leftmost pixel of the character.
