Hi. This is my first post, I hope placed it in good subforum.
Sorry for my poor english. Hope that you understand me. If not, please ask.
Let's start:
I've bought some strange Jornada 728. It has probably daughterboard from 720 one
(but system is from 728 - has VPN
).
There are two Samsung k4s281632B chips on this board, that are 128Mbit each.
After a short search I've found
This topic and
this project.
Question is - does anybody have Jornada 728 64mb, not that crappy 32MB budget-european model? I'd be verry happy if one can unscrew her/his jornada's keyboard, remove the memory daughterboard and take GOOD macro photos of it, including chips' numbers and PCB details around chips.
I found owners of such cut 728's and want to get some way to add RAM to 32MB jornada 7xx. Chips used in flashboards have 2 pins more than k4s281632B and will not fit this PCB.
Back in the days when DOS was still quite popular I had HP 200lx and could add chips from damaged notebook's RAM module. And it worked. But 200lx
(Intel Hornet chip
) had additional ~CS sigal for second bank.
Studying address lines of Jornada 7xx memory connector i've realized that it' could be easy to add 2 256Mbit chips of the same pinout as k4s281632B, but I don't know what chips to use and need even photo of 64MB PCB to get idea about 32 MB pcb rework.
This week I will receive 2 pieces of 32MB daughterboards from Jornada 720 to start fighting with it. I hope that it's identical with my daughterboard.
I have needed tools, experience
(and enough mana
) to start this work, but need some info.
Would one help me - eg. co-work discussing this topic?
Igor
Edited by c64club 2009-07-22 9:54 AM