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| Sanyo WAVY70FD RAM upgrade
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Ivan
msx professional
Berichten: 885 |  Geplaatst: 23 Oktober 2004, 10:12 |
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KNM
msx user
Berichten: 52 | Geplaatst: 23 Oktober 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
J.
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Sonic_aka_T
msx guru
Berichten: 2268 | Geplaatst: 23 Oktober 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.
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SeD_NcL
msx lover
Berichten: 83 | Geplaatst: 23 Oktober 2004, 16:22 |
I also have a Sanyo PHC-70FD. Hans Oranje did the memory expansion. Ask him @ msx[AT]hansoranje.demon.nl.
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Repair-Bas
msx addict
Berichten: 383 | Geplaatst: 26 Oktober 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.
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dhau
msx master
Berichten: 1056 | Geplaatst: 27 Oktober 2004, 04:00 |
Quote:
| I also have a Sanyo PHC-70FD. Hans Oranje did the memory expansion. Ask him @ msx[AT]hansoranje.demon.nl.
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How much memory did he put in your Wavy? |
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SeD_NcL
msx lover
Berichten: 83 | Geplaatst: 27 Oktober 2004, 07:08 |
Quote:
| Quote:
| I also have a Sanyo PHC-70FD. Hans Oranje did the memory expansion. Ask him @ msx[AT]hansoranje.demon.nl.
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How much memory did he put in your Wavy?
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/me starting up his MSX: Main RAM 512 K bytes |
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dhau
msx master
Berichten: 1056 | Geplaatst: 27 Oktober 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
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SeD_NcL
msx lover
Berichten: 83 | Geplaatst: 27 Oktober 2004, 17:18 |
Is that a good idea for a technical lake as myself?
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dhau
msx master
Berichten: 1056 | Geplaatst: 27 Oktober 2004, 17:27 |
For sure it is!  There is a lot of interesting things under the roof, and you'll see them all! ^___^ |
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POISONIC
msx professional
Berichten: 883 | Geplaatst: 27 Oktober 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 
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Repair-Bas
msx addict
Berichten: 383 | Geplaatst: 27 Oktober 2004, 19:58 |
How is that possible.
normal memory, 2 chips of 32 kB (41464) is 18 pins IC
414256 is 20 pins?
Can you explain?
Easy is 128 kB, there are two free places.
When I did 512 kB I used little PCB's. Those area converter from 18 pins to 20 pins.
Then It was one or two wires into the computer, thats all.
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SeD_NcL
msx lover
Berichten: 83 | Geplaatst: 27 Oktober 2004, 20:34 |
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Repair-Bas
msx addict
Berichten: 383 | Geplaatst: 27 Oktober 2004, 20:38 |
Yes correct, you need converterprint, because the layout of the normal chips is different as the new ones.
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dhau
msx master
Berichten: 1056 | Geplaatst: 28 Oktober 2004, 00:56 |
Quote:
| 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
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I actually think it's better to desolder those nicely, since they can be used to upgrade SCC+ to 128K or VRAM to 192K. To desolder chips easily, use desoldering braid or the special solder sucker thingie (they are cheap, sold in same places as soldering irons)
I'm very curious if Wavy 35 is anything like Wavy 70FD. I'm getting Wavy 35 soon (well, hopefully) |
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