17 Nov
2010
17 Nov
'10
8:20 p.m.
On 16 Nov 2010 at 21:33, Tony Duell wrote:
Indeed...
Incidnetally, a trivia question. Does anyone (else) remember the main
difference between am 1103and an 1103A?
Possibly. The 1103 was the first 1K bit DRAM IIRC
after all. However,
I wonder how much was due to problems with the DRAMs themselves and
how much was down to problems with supplies (They are unconventional
for the PMOS 1103s, it's really a main -16V supply and a +3V bias
supply, often states as 16V and 19V), decoupling (they are touchy
about this!), signal timing and the like.
It's worthwhile noting that nobody selected the 1103 for any speed
advantage over core. Less power or complexity, perhaps but it was
quite some time before MOS memories caught up to core in speed.
My own recollections of MOS memory weren't with the 1103s, but the
2107 4K variety. A 22-pin 3-supply chip with TTL compatible I/O,
with the exception of CE, which was kind of strange.
Yes, I've come across those too. I think on oe my I2S image displays is
full of them (over 3000 of the darn things...) And in some HP devices
(1350 'graphics translator' and 9831 comptuer (my 9825 uses 4116-like 16K
DRAMs))
They had non-multiplexed addresses I think. Later DRAMs had multiplexed
address inputs. of course. Was there a good reason for this other than to
save package pins?
-tony