Hp-39GII OS version

[Johnh]

I got one of these NOS recently, given away as a freebie by Calculator World in Australia when I bought my HP15C CE.

I did the On+F4-release test noted above and it showed:

Ver: 04/Sep/2012 Rev:17818 80MHz

TBH, I've gotten nowhere figuring out this machine, it seems very powerful, lots of features to explore, but the screen is so dull, dark-greyish background with lots of very small text in slightly darker grey. I simply can't see it at all.