3 Nov
2005
3 Nov
'05
7:29 p.m.
a.carlini at ntlworld.com wrote:
There was a spate of "fake parity" memory
around some time in
the 90s. Quite why it was cheaper to add a chip that always
supplied "correct" parity rather than simply using additional
memory was something that I never understood. But if you
end up with one these "fake parity" memories it may well
cause your 9-bit machine some issues!!
Well for my 9 bit machine, I am using 16k x 1 and 16k x 4 static ram
chips to give me
64kb of memory out of 256kb of total ram. As far as I know I the fake
parity chips
were dynamic ram. I hope to have 16k of ram for the OS and 48k for user
programs.
However the first goal is to finish the hardware design and debug it for
me.This is turning
into a wider 6800 style processer, but still a small system.
Antonio