Move jumper from
DEN3 to DEN2 to enable disk-change on Pin2 of the connector
Cut trace from Pin
34 leading to the IC in the centre of the board
Connect the right
side of DEN3 to Pin 34
To change the drive
to D0 instead of D1 that is the default for PC floppy drives - Cut trace leading to Pin 12 and connect it to Pin 10
instead.
Something I've considered trying is leaving this set to D1 and using the drive externally as DF1:..A project for another day
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