Hi,

From the posts in the memory upgrade threads, the critical part for a MK2A memory upgrade is
2 of 4Mx16 3.3v 50ns 4k refresh TSOP-50 EDO DRAM: Micron MT4LC4M16R6TG-5 or equivalent.

For a MK1 and a MK2 respectively, 4 ICs are required.
I *think* the correct parts are:
1Mx16 3.3v 50 or 60ns 1k refresh TSOP-44/50 EDO DROM: Micron MT4LC1M16E5TG-5, Siemens HYB3118165BST-60 or equivalent.

In particular, I'm not sure about the speed - 50ns or 60ns? Is the refresh right?