Download THE BBC MICROCOMPUTER IEEE488 INTERFACE USER GUIDE

b)
Four ICs in sockets IC52, IC88, ICIOO and ICIOI (these sockets are all next to each
other despite the numbering) identified with the legends "C", "D", "E" and "F"
respectively printed on the top. If this is the case the BASIC language IC
(identifiable by the legend "BOI" printed on the top) and all four MOS ICs should be
removed as described in 'a' above. Replace the BASIC IC in socket IC100 as
described in '8'.
8
The new MOS is supplied In a single IC identified by the legend "B04" printed on
the top. Insert the ROM carefully into the socket 1C51 ensuring that all the 'legs'
locate properly into the holes and are not 'bent under' upon insertion. The IC should
be orientated so that the semi-circular cutout in the top of the IC is at the top, i.e.
away from the keyboard. Avoid touching the IC legs with your fingers wherever
possible.
Now set the following links:
518 North
519 East
S20 North
521 Two off East/West
S22 North
S32 West
S33 West
N.B. North is the edge of the PCB nearest to the back of the case and
South is the edge nearest to the keyboard. East and West follow logically from
these.
9
Insert the IEEEFS EPROM IC into any free socket (IC88, ICIOO or ICIOI) as
described in 8. If you have a disc filing system (DFS) ensure that the IEEEFS
EPROM is inserted to the right of the DFS IC.
10
Reassemble the BBC Microcomputer by reversing instructions 2 to 5.
11
To check that the IEEEFS EPROM has been fitted correctly type
*HELP IEEE
The computer should display
IEEE Filing System <version number>
O.S. <version number>