Expansion Bus Enable Register
From SpecNext official Wiki
Number | $80 |
---|---|
Readable | Yes |
Writable | Yes |
Short Description | Expansion bus enable/config |
Bit | Description |
---|---|
Values affecting machine immediately | |
7 | 1 to enable Expansion Bus |
5 | 1 to disable I/O cycles and ignore IORQULA |
4 | 1 to disable memory cycles and ignore ROMCS |
After soft reset (will be copied to bits 7-4) | |
3 | 1 to enable Expansion Bus |
1 | 1 to disable I/O cycles and ignore IORQULA |
0 | 1 to disable memory cycles and ignore ROMCS |
Set to 0 upon hard reset.
(new register since core 3.0.5)
(note: Next registers with number higher than $7F are inaccessible from Copper code)