65. Error calls
    ~~~~~~~~~~~
Here is a selection of interesting calls into ROM, suggested by Dave
Woodhead. Most of them differ between Basic-1 and Basic-2, so Basic-1
addresses are given first, then Basic-2 addresses are in brackets. You can
use them to deliberately generate errors inside a program, and they can be
trapped in the usual way with ON ERROR GOTO, except for "fatal" ones such as
'Break', and 'Silly'. Note that the calls for 'Break' and 'Locked' are into
the OS ROM, and apply to version 1.20 only. There must be all sorts of
devious uses for these calls, especially the ones for 'Escape', 'Break' and
'Locked'. The syntax is simply CALL &D9CD, CALL &F1F9, and so on.

       D9CD=Soft Break              D9DA=Hard Break
       F1F9=Locked            9839(982A)=Syntax error,
 9848(9838)=Escape            97F0(9821)=Mistake
 A677(A66C)=Too big           AA45(AA38)=Accuracy lost
 AE72(AE43)=No such variable  B1B9(B18A)=Bad call,
 8F2F(8FDF)=Silly             99A6(99A7)=Division by zero
 98DD(9C03)=String too long   AED9(AEAA)=Bad HEX.