northumbria61 & Crossbow7, Many thanks for the advice.
Crossbow7: I too had looked at the Crucial site but could only find references to the V2045 & V2060 machines, though even on those pages it does at least say "Each memory slot can hold DDR2 PC2-5300 with a maximum of 1GB per slot.* *Not to exceed manufacturer supported memory." Doesn't seem illogical to assume it's the same for the V2055 model.
northumbria61: Thanks for the link. That's a good price.