| Register | Address | Read/Write | Agnus/Denise/Paula | Function |
|---|---|---|---|---|
| SPRxCTL | 142 | W | A D( E ) | Sprite x vert stop position and control data |
| SPRxPOS | 140 | W | A D | Sprite x vert-horiz start position data |
These two registers work together as position, size and feature sprite-control registers. They are usually loaded by the sprite DMA channel during horizontal blank; however, they may be loaded by either processor at any time.
SPRxPOS register:
| BIT# | SYM | FUNCTION |
|---|---|---|
| 15-08 | SV7-SV0 | Start vertical value. High bit(SV8) is in SPRxCTL register below. |
| 07-00 | SH8-SH1 | Start horizontal value. Low bit(SH0) is in SPRxCTL register below. |
SPRxCTL register (writing this address disables sprite horizontal comparator circuit):
| BIT# | SYM | FUNCTION |
|---|---|---|
| 15-08 | EV7-EV0 | End (stop) vertical value low 8 bits |
| 07 | ATT | Sprite attach control bit (odd sprites) |
| 06-04 | X | Not used |
| 02 | SV8 | Start vertical value high bit |
| 01 | EV8 | End (stop) vertical value high bit |
| 00 | SH0 | Start horizontal value low bit |