Just curious, what consitutes a 'letter' verses a 'number' upgrade?

I.e. Why 8a...b...c...? Rather than 8...9...10...etc.

Paul.



Paul Haigh, 6GB, Blue
Reg: 4120 - Serial 00254
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Paul Haigh, Reg. 4120 (mk1) 6GB, Blue, 00254 (mk2) 12GB, Red, 00357