Author: Flash/FLC (port263.cvx2-sto.ppp.netlink.se)
Date: 10-06-2001 01:15
Yes, your discussion makes sense, but facts
still remains. I donīt know why they did this,
and I kinda hate them for it...
Anyway, the scematic (CPU-FPU part) is in your
mailbox, please have a look at the mess.
Another weird detail: on the FPU slot, all
32 DATA bits are connected, but look at it!
Bits 0-15 are connected to 0-15, BUT then
it starts over, Bits 16-32 are connected to
the same bits 0-15 again!! -Weird, EH!?
-One could wonder how this can work??
For the expansion RAM cards, the only option
would be to use simple multiplexing, right?
Of course this brings down the speed even
more. Fact is that the Falcīs expansion slots
works similar to the STīs cartridge port:
J16 brings out 24 ADR bits + all CPU signals.
J20 brings out 16 DATA bits + some other stuff.
The CenTurbo boards have their own CPU, so
they can access their own RAM by 32bits, but
they communicate with the Falcons motherboard
via the poor 16 bits available at J20.
>"the TT is about 40% faster (by using the 16
> MHz ST-RAM) which is a correct value when > both machnes have 32 bit RAM access."
Well, I donīt know about the TT, but there is
no 32 bit access in a Falcon. Sad, but true.
Now, I always thought that "ST-RAM" IS 16 bit
and the so called "fastRAM" might be 32bit,
but I may be wrong?
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