From my handy
little table on PSUs you get the following:
Type Part number 5V current 12V current -12V current
A500 312503-02 2.5A 1.0A 0.1A
type 1
Heavyweight
A500 type 2 (lightweight design)
312503-03 4.5A 1.0A 0.1A
A600/A1200 PSU
391029-02 3.0A 0.5A 0.1A
Same part number in small and large case sizes!
CD32
2.0A 0.5A N/A
All figures obtained by reading the labels on the PSUs.
Sorry if the text is screwed up.