> Surely your machine has a internal modification ...
No, my TR is not modified.
And the 4 MB expansion is external.
I think the matter is that internal TR memory, has only a register of 5 bit
for the mapper,
and the remaining 3 bits are "unconnected".
But the 4 MB cartridge has a register of 8 bits for mapping.
Well, if you want, I can make a serious test of the 4MB external, and T-R.
Anyway, I don't think you need more than 512 KB at a Turbo R, mainly if you
have got a MegaScsi, it is enough 512 KB Ram.
I think it is more interesting other peripherals like Z380 board I have got.
It can access lineally the Ram, up to 128 MB.
Bye
Daniel Zorita
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