Sanyo WAVY70FD RAM upgrade

By Ivan

Ascended (9371)

23-10-2004, 10:12

Oh, I've found:
http://www002.upp.so-net.ne.jp/ahiroe/msx/ramzousetu.html

where you can see how to upgrade to 128Kb a Sanyo PHC-70FD.

By KNM

Master (172)

23-10-2004, 11:49

I´ve got a Wavy70FD too,upgraded by LASP to 256Kbs....I don´t know how to make it....but still i wanted more ram....like 512Kbs and beyond if this could be possible.

regards

By Sonic_aka_T

Enlighted (4130)

23-10-2004, 14:57

I dunno, I think it has something to do with being able to find the right address lines. Perhaps repair-bas has some experience with these computers.

By SeD_NcL

Master (152)

23-10-2004, 16:22

I also have a Sanyo PHC-70FD. Hans Oranje did the memory expansion. Ask him @ msx[AT]hansoranje.demon.nl.

By Repair-Bas

Paragon (1176)

26-10-2004, 19:00

I looked on my electronic parts and 128 kB is the maximum.

It is also possible to connect new drives and change the computer to 230 Volt.
No extra stepdown-trafo needed.

Only change one part in the power supply.

By dhau

Paragon (1570)

27-10-2004, 04:00

I also have a Sanyo PHC-70FD. Hans Oranje did the memory expansion. Ask him @ msx[AT]hansoranje.demon.nl.

How much memory did he put in your Wavy?

By SeD_NcL

Master (152)

27-10-2004, 07:08

I also have a Sanyo PHC-70FD. Hans Oranje did the memory expansion. Ask him @ msx[AT]hansoranje.demon.nl.

How much memory did he put in your Wavy?

/me starting up his MSX: Main RAM 512 K bytes

By dhau

Paragon (1570)

27-10-2004, 16:42

Nice! It's much better then 64 or even 128K ^_^

Can you open your computer and take picture of mods? May be this way we'll figure out how to add 512K in Wavy

By SeD_NcL

Master (152)

27-10-2004, 17:18

Is that a good idea for a technical lake as myself?

By dhau

Paragon (1570)

27-10-2004, 17:27

For sure it is! There is a lot of interesting things under the roof, and you'll see them all! ^___^

By POISONIC

Paladin (1012)

27-10-2004, 19:34

to place bigger mem into a wavy is simple if you can solder good enough

so dont use that big solder things

15watt is enough for a good solder expirience

step one : cut out the old memmory

step two : remove the pins from the memmory from the pcb heat a little bit and remove it with a pincet

step three : put the 4 new ic sockets in its place

step four : place two extra capasators next to the IC sockets

step five : put 4 x 414256 100ns or 80ns

step six : search for the wire bridges wire them all to

1 2-3
1 2-3

and and test it !

and then you have 512KB internal