Implement support for the RunCPM-Specific function F_UPTIME #159
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This pull-request implements BDOS call 0xF8 / 248, which is the F_UPTIME syscall, designed to show elapsed time since startup. We return the time in nanonseconds rather than milliseconds, just to mix things up a little. Though in practice the value of either measurement will wrap around so quickly the increase granualarity is almost worthless. This PR doesn't add any of the other RunCPM-specific syscalls as those have not yet been seen in the wild. It is only the v5 of BBC BASIC which seems to call the F_UPTIME syscall for some reason. This closes #158.
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This pull-request implements BDOS call 0xF8 / 248, which is the F_UPTIME syscall, designed to show elapsed time since startup.
We return the time in nanoseconds rather than milliseconds, just to mix things up a little. Though in practice the value of either measurement will wrap around so quickly the increase granularity is almost worthless.
This PR doesn't add any of the other RunCPM-specific syscalls as those have not yet been seen in the wild. It is only the v5 of BBC BASIC which seems to call the F_UPTIME syscall for some reason.
This closes #158.