VIC 6560/6561 (Video Interface Chip) reference
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | ||
|---|---|---|---|---|---|---|---|---|---|
| $9000 (R/W) | Interlace | Screen Origin X | |||||||
| $9001 (R/W) | Screen Origin Y | ||||||||
| $9002 (R/W) | Screen A9 | Number of Video Columns | |||||||
| $9003 (R/W) | Raster b0 | Number of Video Rows | Char Size | ||||||
| $9004 (R/W) | Raster Value bits 8-1 | ||||||||
| $9005 (R/W) | Screen Memory Location (A13-A10) | Char Memory Location (A13-A10) | |||||||
| $9006 (R/W) | Lightpen X | ||||||||
| $9007 (R/W) | Lightpen Y | ||||||||
| $9008 (R/W) | Paddle X | ||||||||
| $9009 (R/W) | Paddle Y | ||||||||
| $900A (R/W) | Switch | Bass Frequency | |||||||
| $900B (R/W) | Switch | Alto Frequency | |||||||
| $900C (R/W) | Switch | Soprano Frequency | |||||||
| $900D (R/W) | Switch | Noise Frequency | |||||||
| $900E (R/W) | Auxiliary Color | Volume Control | |||||||
| $900F (R/W) | Screen Color | Reverse | Border Color | ||||||