Memory Paging Control
From SpecNext Wiki
| Number | PortNumber::$7FFD |
|---|---|
| Decimal | NumberDec:: |
| Short desc. | ShortDesc::Selects active RAM, ROM, and displayed screen. |
| Bit Mask | PortMask:: |
| Readable | Readable::No |
| Writable | Writable::Yes |
| Subsystem | Subsystem::Memory map |
Selects the active memory page in slot 4 at $C000. See Memory map.
Any values written to this port should also be stored at $5B5C if any OS routines are in use.