Read/Write to mapped IO
Categories:
| OSByte call | Action | Available on: | |||
|---|---|---|---|---|---|
| (dec) | (hex) | BBC | Master | Electron | |
| 146 | 92 | Read IO in &FCxx FRED | x | x | x |
| 147 | 93 | Write IO in &FCxx FRED | x | x | x |
| 148 | 94 | Read IO in &FDxx JIM | x | x | x |
| 149 | 95 | Write IO in &FDxx JIM | x | x | x |
| 150 | 96 | Read IO in &FExx SHEILA | x | x | x |
| 151 | 97 | Write IO in &FExx SHEILA | x | x | x |
Entry parameters
| X | Address within specified page for the call |
|---|
On exit:
| A | preserved |
|---|---|
| X | undefined |
| C | undefined |
Refer to the hardware secion about the FRED, JIM & SHEILA 1MHz buses.
Last modified October 6, 2021: Move BBC content into subdirectory to allow more bbc content (23080e8)