Hi from Perth (Microbee user 1985)

[ChickenMan]

The first Microbee model with Colour built in was the Premium series. But in mid 1983 a colour board was available for installing in the Microbee's sold at the time. They were rather complex to add so was available only through Applied Technology to do the upgrade. From their 83 price list -

M'Bee Std. or Plus 16K or 32K conversion to colour. $190
M'Bee I.C. & 64 conversion to colour $179