# Define a Bitmapped GCOS

Defining a new GCOS consists of assigning:

- a number (of the new GCOS you are defining, or an existing GCOS you are modifying. We recommend that you do NOT modify the default GCOS1.) Bitmapped GCOS are numbered 1-64. Affinity GCOS are numbered 65-32267.

- a name (a descriptive name up to 15 alphanumeric characters. Not required for Affinity GCOS.)

- the required groups (all groups to include in this GCOS. Affinity GCOS does not contain groups.)

To define a bitmapped GCOS: (You can use this procedure to define a new GCOS or to modify an existing GCOS.)

1. Complete a GCOS Worksheet. (See a sample worksheet.)

2. From the Main Menu, select (S) System Maintenance, (R) Reconfiguration, and then (G) Group COS.

3. Select (C) Current GCOS and enter the number (1-64) of the bitmapped GCOS you are defining.

4. Select (N) Name GCOS and enter a descriptive name for the new GCOS.

5. Select (A) Add Group and then enter the one- to three-digit numbers of all groups that comprise this GCOS in one of the following formats:

   - A single group, for example, 3

   - A range of groups, for example, 1-128

   - A series of groups, for example, 3,4,6,7

   - L to specify the lower half (1-64)

   - U to specify the upper half (65-128)

   - A to specify all group numbers

   - E to specify even group numbers

   - O to specify odd group numbers

   You can mix types of entries, so you can specify all the bits necessary in one attempt. For example, this entry is valid: 1,3,4-19,U. Do not enter spaces after commas, and do not end the entry with a comma.

6. If necessary, you can delete groups from the GCOS by selecting (D) Delete Group and entering the group number(s) to delete. Use the same format as for adding groups.

7. To verify that the information you have entered matches your worksheet, select (S) Show GCOS and enter the GCOS number.

8. When you are finished defining the GCOS, save it by exiting from the Group Class of Service Menu.

9. Copy the number of this defined GCOS from your GCOS worksheet to the appropriate mailbox worksheet.