SANYO WAVY 70FD MSX2+ RAM Expansion

Por JAPANRETRO

Rookie (24)

imagem de JAPANRETRO

09-03-2007, 13:55

Hi !
Someone knows how to expand 64kb memory of my Sanyo onboard?
There is a tutorial on the net?
Regards.
Davide.

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Por Repair-Bas

Paragon (1161)

imagem de Repair-Bas

09-03-2007, 16:25

very simple

put two Ram IC's in the spare-places and 2 condensators

Por Ivan

Ascended (9330)

imagem de Ivan

09-03-2007, 20:03

Not true, I expanded a Wavy70 to 128kB long time ago -putting 64kB into the free socket- and you have to solder two memory pins between the two RAM chips and change a jumper.

Por Ivan

Ascended (9330)

imagem de Ivan

09-03-2007, 20:11

Por dhau

Paragon (1570)

imagem de dhau

17-03-2007, 05:40

I did the 512K upgrade on Wavy 35J. I don't think 70FD is a lot different. I had to remove 2x4464 dram chips and wire four 44256 chips on a small separate pcb, then use wires from IDE cable to connect all signals from original 4464 sockets and two more signals from MSX engine chip. Alexandro, MSX user from Brazil, made similar upgrade a year after me and he even documented all the process. If I'll find the link to his instruction, I'll post it here.

Por dhau

Paragon (1570)

imagem de dhau

17-03-2007, 05:44

As I promised: Tabajara Labs Wavy 70FD2 512K

Just a consideration: I used shorter wires and had decoupling capacitors on top of each dram chip.

Por novi_skt

Supporter (7)

imagem de novi_skt

14-04-2007, 12:17

hi, im a spanish user.
in a two wheeks i have a wavy msx 2+, and i like upgrade to 512k.
when the msx are in my hands i'm try make a little pcb for the esasy upgrade,
but im not read portugues, are more info in english??

sorry for my english!!!