The Lynx's RENUM command can be useful but its use is sometimes restrictive if only certain parts of the program need RENUMbering.

By altering the contents of &61FA, which points to the start of the Basic program (usually &694D), it is possible to use RENUM on only part of the program.

To RENUMber from any line in the program to the end simply:

DPOKE &61FA,LCTN(X)-7

where 'X' is the line number you wish to begin from. Now simply RENUMber as required and then return the pointer to its original position using:

DPOKE &61FA,&694D

If only a section of the program needs RENUMbering, i.e. lines A to B inclusive, change the starting pointer as before:

DPOKE &61FA,LCTN(A)-7

Make note of the original value of your 'B' end value:

PEEK (LCTN(B)-7+PEEK(LCTN(B)-2))

Poke into this position &80 (standard end delimiter) as follows:

POKE LCTN(B)-7+PEEK(LCTN(B)-2),&80

RENUMber the program as appropriate.

Before listing the whole program you must return original pointers. The starting pointer is:

DPOKE &61FA,&6941

The end pointer must be reset to the new line number of 'B':

POKE LCTN(B)-7+PEEK(LCTN(B)-2),X

where 'X' is the value originally at 'B'.

M. S. Fowkes
Bearpark, Durham