Before trying to insert an IC into a socket first check to see if the legs

of the IC are parallel with each other. If they appear crooked or splayed

apart then they should be re-aligned. To do this hold the IC sideways-on

and press it gently against a firm flat surface, repeat this for the other side

of the IC.

To insert an IC, hold the ends of the IC between thumb and forefinger and

line-up all the pins over the socket. Pin 1 should face to the WEST (or

left-hand side) of the pcb. note: all of the ICs on the pcb face in the

same direction.

Apply firm pressure to the IC, but do not force it into the socket. Check

that all the pins have entered the socket and that none of them are bent

either outwards or under the body of the IC.

Referring to the diagram below and to silk screen markings on the pcb

insert the new ROM(s) as described above.

3. ROM operating priorities

ROM sockets have what is known as "Operating priorities". Essentially

this means that the ROM with the highest operating priority contains the

software (BASIC, PASCAL, VIEW etc.) that will be entered when the machine

is switched on or after a "hard reset" (CTRL BREAK) is performed. The

operating priority also governs which ROM will respond to a "*" command if

more than one is programmed to do so. The computer is supplied with BASIC

in the highest priority position and this will need to be changed if you

wish to default to another language. (How to do this is described below).

Each of the sockets is given a priority ranging from 0 to F (Hexadecimal),

where F is the highest priority and 0 is the lowest. The priority number

is actually known as the ROM's slot number. If you type:

             *ROMS   RETURN

the system slot numbers are displayed on the screen with the title of the

Software actually in the ROM(s). For example:

ROM F UTILS 01

ROM E BASIC 40

ROM D ACORN ADFS 01