CUBE MOS OSWORDS
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 0 - Read input line
 1 - Read TIME
 2 - Write TIME
 3 - Read interval timer
 4 - Write interval timer
 5 - Read I/O memory
 6 - Write to I/O memory
 7 - Unsupported by MOS (SOUND)
 8 - Unsupported by MOS (ENVELOPE)
 9 - POINT
10 - Unsupported by MOS (Read character definition)
11 - Unsupported by MOS (Read palette)
12 - Unsupported by MOS (Write palette)
13 - Unsupported by MOS (Read graphics position)
14 - Read from M3002 Real Time Clock
15 - Write to M3002 Real Time Clock
16 - Enable/Disable VIA Timer1 IRQs
17 - Read enable/disable status of VIA Timer1
18 - ?
19 - Specify buffer location and size
20 - ?


OSWORD 14 - Read M3002 RTC, OSWORD 15 - Write M3002 RTC data
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On exit from OSWORD 14: XY+0: 16 bytes of RTC data
On entry to OSWORD 15:  XY+0: 16 bytes of RTC data
  XY+0 : clock seconds  &00-&59
  XY+1 : clock minutes  &00-&59
  XY+2 : clock hours    &00-&23
  XY+3 : clock date     &01-&31
  XY+4 : clock month    &01-&12
  XY+5 : clock year     &00-&99
  XY+6 : clock day of week
  XY+7 : clock week of year
  XY+8 : alarm seconds &00-&59 or &FF for any
  XY+9 : alarm minutes &00-&59 or &FF for any
  XY+10: alarm hours   &00-&23 or &FF for any
  XY+11: alarm date    &01-&31 or &FF for any
  XY+12: timer seconds &00-&59
  XY+13: timer minutes &00-&59
  XY+14: timer hours   &00-&23
  XY+15: status


OSWORD 19 - Define a buffer
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On entry: XY+0:   buffer number 0-15
          XY+1-2: start address to user for buffer
          XY+3:   length of buffer
Any contents of the previous buffer are abandoned, and the new empty buffer is
created.