Hi Sally,

the meaning of ORG and CSEG,... was fully different.

1.
CSEG, DSEG, BSEG,... select a memory segment

2.
ORG select an address inside the current memory segment

3.
CSEG at 100h was a combination of 1. & 2.

4.
On starting assembling CSEG was always the default segment.
So all following ORG statements related to the CSEG until a different segment was selected.

5.
On the 8051 only CSEG can contain code and constants (DB, DW).
All other segments can only contain data (DS, DBIT).


Peter