HP Images by Andrea Domenichini

This is the description of the images I took during the upgrading of my
HP48G. I've followed instruction of Thijs Kaper and Thomas Otten, but
I've done some useful changes. 256kB of final memory, with two normal DIP
memory chips.
It took me about three days to do it, but I think that two full-
immersion days are sufficient.
All images have been taken with a plane scanner:

DomeHp01.jpg	Complete image of the ORIGINAL internal top part of the
		opened HP48G.	(86kB)

DomeHP02.jpg	Complete image of the ORIGINAL internal bottom part of 
		the opened HP48G.	(60kB)

DomeHp03.jpg	Zoomed-in vision of the RAM/ROM original part of the HP.
		(39kB)

DomeHp04.jpg	Very zoomed-in vision of the added SMD 74HC00. (25kB)

DomeHp05.jpg	Complete image of the UPGRADED internal top part of the
		opened HP48G.	(81kB)

DomeHp06.jpg	Complete image of the UPGRADED internal bottom part of
		the opened HP48G.	(62kB)

DomeHp07.jpg	Very zoomed-in external vision of the added dip-switch
		under top-left rubber foot, which serves to swap between 
		Read/Write and Only Read State of the second 128kB chip.
		(12kB)

For questions about materials and tools used, tricks, etc... 

 _____________________________________________________
|  Andrea Domenichini   |	Bologna -ITALY	      |
| Electronic Technical  | dir3784@iperbole.bologna.it |
|-----------------------------------------------------|
| 	  "Engineers don't live; they function."      |
|_____________________________________________________|