Instruction Modifiers
| Bit 7 | Bit 6 | Bit 5 | Bit 4 | Bit 3 | Bit 2 | Bit 1 | Bit 0 |
|---|---|---|---|---|---|---|---|
| DLI | LMS | VS | HS | ? | ? | ? | ? |
Bits 7:4 are modifiers for Playfield Mode instructions in bits 3:0. Playfield Mode Instruction values range from $02 to $0F. Modifier bit value 1 Enables the modifier, and 0 disables the modifier.
- Bit 4 - $10hex/16dec Horizontal Scroll.
- Bit 5 - $20hex/32dec Vertical Scroll.
- Bit 6 - $40hex/64dec Load Memory Scan.
- Bit 7 - $80hex/128dec Display List Interrupt.
Read more about this topic: ANTIC, The Display List
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