2+ in a NMS 8245?

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By OeiOeiVogeltje

Paragon (1426)

OeiOeiVogeltje의 아바타

29-11-2008, 13:56

i recently aquired a Yamaha V9958 Chipset
and now i want to put it in a NMS 8245

and of course no shematic is to be found!

so my question;
Does anyone have any stuff lying around on 8245 expansion (of any kind)?

thanks!!

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By Erikie

Champion (324)

Erikie의 아바타

29-11-2008, 21:54

By Jipe

Paragon (1594)

Jipe의 아바타

29-11-2008, 22:09

is possible
i make a 8235 with a 2+ VDP but i change EPROM and added another EPROM for all function 2+
eprom change with keyboard AZERTY or QWERTY
i have not the schematic for 8235 but i can make it

By OeiOeiVogeltje

Paragon (1426)

OeiOeiVogeltje의 아바타

29-11-2008, 22:40

Erikie
thanks for that link
im affraid lines like this one; "make a connection with p26 of the VDP and the resistance R1 inserts you a diode"
makes me wanna use etreme caution actually doing this
in other words
i dont understand what he means

By Jipe

Paragon (1594)

Jipe의 아바타

29-11-2008, 23:41

for the 2+ VDP required this schema

pin 26 VDP ------i

diode is 1n914 or 1n4148 type

By OeiOeiVogeltje

Paragon (1426)

OeiOeiVogeltje의 아바타

29-11-2008, 23:45

how do you know that?

By RetroTechie

Paragon (1563)

RetroTechie의 아바타

30-11-2008, 02:01

Bullshit alert: oO
* In the page linked above, I spotted 3 errors already, without even needing some databook to spot those.
* If you do grab those databooks, read that page again and *can't* spot several errors, then you shouldn't even try this mod. More exactly: as described in above page, you shouldn't try at all - won't give you an MSX2+, may damage your V9958

By Manuel

Ascended (19273)

Manuel의 아바타

30-11-2008, 13:14

RetroTechie: OK, please make a good description then and post it here Smile

By Jipe

Paragon (1594)

Jipe의 아바타

30-11-2008, 14:30

i know by a old schema for upgrade msx2
in the data book of msx2+ wait signal from VDP is direct to wait signal from Z80

i have a 8235 and a 8280 with VDP V9958 inside and work fine

fore more info see this link

http://msx.retro8bits.com/msxdocs/msx2plus.pdf

By OeiOeiVogeltje

Paragon (1426)

OeiOeiVogeltje의 아바타

03-12-2008, 19:43

well
this is confusing.......

By Erikie

Champion (324)

Erikie의 아바타

03-12-2008, 20:34

Isn't it possible to do the same connections as in a 8250? I have not yet looked at my 8245 but I can try to put a 9958 in it. Still have one at hand Smile along with a socket

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