As a quick add on to Arnies reply:
If, like me, you live in a country that doesn't use 5c coin mechs, trying to change price to 99.95 will throw an 'invalid price' message.
To get around this, Power down machine, disconnect coin mech from MDB cable, power machine back up.
The board will now allow you to select 99.95 as valid.
Change DP value, then power down/reconnect coin mech/power back up.
Fixed!