2+ in a NMS 8245?

Страница 1/2
| 2

By OeiOeiVogeltje

Paragon (1426)

Аватар пользователя OeiOeiVogeltje

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!!

Для того, чтобы оставить комментарий, необходимо регистрация или !login

By Erikie

Champion (324)

Аватар пользователя Erikie

29-11-2008, 21:54

By Jipe

Paragon (1594)

Аватар пользователя Jipe

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)

Аватар пользователя OeiOeiVogeltje

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)

Аватар пользователя Jipe

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)

Аватар пользователя OeiOeiVogeltje

29-11-2008, 23:45

how do you know that?

By RetroTechie

Paragon (1563)

Аватар пользователя RetroTechie

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)

Аватар пользователя Manuel

30-11-2008, 13:14

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

By Jipe

Paragon (1594)

Аватар пользователя Jipe

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)

Аватар пользователя OeiOeiVogeltje

03-12-2008, 19:43

well
this is confusing.......

By Erikie

Champion (324)

Аватар пользователя Erikie

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

Страница 1/2
| 2