HP 49G Advantages over 49g+ & 50g

[jebem]

It seems the HP 49G is the last calculator to use a native Saturn processor (last generation 4MHz Yorke 1LT8 processor, made by NEC until ceasing the production in 2003 and setting the end of the 49G model).

Another plus points according to Finseth:
"CAS, rubber keys, use of flash, use of field upgradability, CUT/COPY/PASTE/FIND-REPLACE, TOOL, downloadable fonts"

Also we can read about Easter Eggs in the HP-49G FAQ at the hpcalc.org site among other goodies.

Concerning the alleged bad reputation related to the initial production batches (keyboard and screen lens issues), it seems that it is safe to buy those made after mid 2000.
Can anyone confirm this?

BTW, anyone knows what is the meaning of IREM and ERAM in the context of the HP calculators?

I see several remarks posted for HP 49 series, like this one, where references are made to:
- Port 0 (IRAM): Volatile static RAM shared with "System RAM", cleared by a memory clear operation.
- Port 1 (ERAM): Static RAM, but it's not shared with "system RAM", and is not cleared by a memory clear operation.
- Port 2 (FLASH): Non-volatile Flash memory.
- Port 3 (SD): Flash memory on SD Card (Not present on 49G).

Could it be that IREM means Internal RAM (located inside the Yorke 1LT8 processor), and ERAM means External RAM (an additional SRAM chip)?