OSBYTE &49
OSBYTE &49 (73): Integra-B calls
On entry:
X=&FF - returns X=&49 indicating Integra-B is present
On exit:
X=&49 - Integra-B is present
X=&FF - call unsupported
On entry:
X=&FE - initialise alarm
On exit:
???
On entry:
X=%0000mmtt - update RTCUpdateOptions
Options are set to (oldOptions AND mm) EOR tt
b0=Alarm generates a User Event
b1=Alarm generates Service Call &49
If the options are set to non-zero, the RTC interupt enable is updated
See Also
- OSWORD &49 - Integra-B shadow memory calls
- OSBYTE &49 - Check for Integra-B shadow memory
- OSBYTE &6C - Select Master/Integra-B shadow memory
- OSBYTE &6F - Select Aries/Watford shadow memory
- OSBYTE &70 - Select memory for Master VDU access
- OSBYTE &71 - Select memory for Master video display
- OSBYTE &72 - Select future use of shadow memory
- OSBYTE &73 - Select shadow bank
- OSBYTE &74 - Check for Solidisk shadow memory
- Paging in video memory
- http://mdfs.net/Docs/Comp/BBC/Osbyte00
