Model 100 RAM
Francesco Messineo module
https://drive.google.com/folderview?id=1rF_nFrhEnfzX1KegC4IFeMjA82ylhO0f
NEC module
There was an NEC module on ebay for a while. These work in Model 100.
http://ebay.com/itm/251666092812 (sold out now)
If someone wants to clone the design, I have a few of these and can send you one.
8k (8,192-word) × 8-bit Static RAM
Components:
NEC D4364G-15L
http://www.electronicbeetle.eu/beetle/ICS/memory/RAM%20SRAM/SRAM%2008kx8%20Module%20D4364G-15L.pdf
TIHC148 is probably 74HC148 manufactured by Texas Instruments
Length 36mm / 1.42"
Width 22mm / 0.87"
row spacing 19mm / 0.74"
pin pitch 2.54mm / 0.1"