0340-0357 ---- RTC (1st Real Time Clock for XT), (alternate at 0240-0257)

                (used by TIMER.COM v1.2 which is the 'standard' timer program)

0340   r/w 0.01 seconds  0-99
0341   r/w 0.1 seconds   0-99
0342   r/w seconds       0-59
0343   r/w minutes       0-59
0343   r/w hours         0-23
0345   r/w day of week   1-7
0346   r/w day of month  1-31
0347   r/w month         1-12
0348
0349   r/w year          0-99
034A
034B
034C
034D
034E
034F
0350   r   status?
0351
0352
0353
0354   r   status?
0355
0356
0357