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REU REU is just RAM expansion. But in opposition to PC expanding memory in C64 doesn't
really matter. Not many programs use RAM expansion, like e.g. GEOS. But it's possible to
use REU as RAM-disk what means very fast storage device (for REU 1764 with capacity of 256
kB which you can see on the photo it's 989 blocks. 1 block = 256 bytes [exactly 254
because 2 bytes are required for block info, ID]). Data are send between computer and REU
with 1 Mbps. Unfortunatelly REU is connected to Expansion Port of C64, the same which is
used to attach cardridge and so you can't use both in the same time (though I have heard
that original Action Replay cardridges had ability to attach second device to expansion
port).
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