17 Dec
2009
17 Dec
'09
8:47 p.m.
On 17 Dec 2009 at 19:54, Geoffrey Reed wrote:
Was the 2114 the chips that were 4116's that only
half the memory
cells were functional in? ISTR that one of the lower capacity ram
chips were failed higher capacity chips that only half of the chip
worked.
No, the 8K chips were the Intel 2109--half of a 2117. They had a two-
piece part number; the second half was S6xxx. If the xxx was even
you set address bit 14 high, otherwise you set it low.
I probably still have a bunch of these--they were castoffs from work
when we got some "real" 16K DRAMs, I got to keep the '09s. Curiously
most of the 09s worked just fine in full 16K mode and passed every
diagnostic I could throw at them. So calling them "bad" was perhaps
a little misleading. It could well have been that half the chip
didn't meet specs.
--Chuck