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IFEL ARM3 (top)
The IFEL ARM3 is an upgrade for ARM2 computers (i.e. A305, A310, A440, A410/1, A420/1 and A440/1) and some versions may be fitted to the A3000. The upgrade also requires the MEMC1a upgrade if not already fitted. The ARM3 upgrade can be used with either RISC OS 2 or RISC OS 3.
This ARM3 is clocked at 25MHz.
The Fitting instructions are available HERE .
I don't have the IFEL !ARM3 application to disable/enable cache. The Aleph1 ARM3 upgrade disc has a utility to turn cache on/off which may work with the IFEL upgrade