16 Dec
2008
16 Dec
'08
6:50 p.m.
The 1103 was dynamic and while cheaper it was also
hard to work with
due to refresh and interface needs.
The thing I rmemeber about the 1103 was that it's PMOS. Not only does it
need strange supply voltage levesl (+16V and +19V), but also all I/O pins
(address, data, etc) work at, IIRC, 16V levels. There were Intel chips to
covnert those to TTL (3207, 3208 I think), but they came out later than
the 1103.
The HP9810 calculator uses '06 + active pull-up (1 transistor) circuits
to level-shift TTL to PMOS levels, and IIRC some kind of fast comparator
to take the data outputs back to TTL.
-tony