14 Apr
2008
14 Apr
'08
12:51 a.m.
JMP wrote:
Are they named RAM in databooks? or registers?
The Fairchild 9030 and 9033 are described in the databook as an "8 Bit
Memory Cell" and "16 Bit Memory Cell", respectively. They're
obviously
read/write memory that is randomly addressable, so they are RAM.
I'm not sure about the 9030, but the 9033 uses "coincident select",
like core memory. You provide a decoded one-of-four row address and
a decoded one-of-four column address. "As many as four locations may
be addressed simultaneously without destroying stored information."
It was common for early RAM chips not to use a linear address. Those
that did were often described as "fully decoded RAM". The 9033 is
thus a "not fully decoded RAM".
Eric