F4/FMPAC Light Combo Board project

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By meits

Scribe (6571)

Аватар пользователя meits

08-02-2021, 15:26

Are you sure you can fit a socket and this board and the z80 between the mainboard and the diskdrive? There's practically no space there.

By rolandve

Champion (372)

Аватар пользователя rolandve

09-02-2021, 06:45

Mmm, never thought about that. Thanks for the information!
Anyone found a FD for the MSX type slim? Otherwise a SD/MCC substitute for the floppy drive.

By ddehaan

Expert (73)

Аватар пользователя ddehaan

22-02-2021, 13:39

Hi Alexey,

I still have a few questions Smile Am i correct to asume that the IC's on the backside of the board is the F4 portion (wich i don't need)?

IC2 and IC3 are kind of tough to find in a D package. Ordered the wrong ones from Aliexpress (the non D versions) and of course they don't fit Smile If the backside isn't needed for the FM Pac portion, i don't have to get them Smile

I also couldn't find a

Kind regards,

By ddehaan

Expert (73)

Аватар пользователя ddehaan

22-02-2021, 17:26

Never mind, found the parts Smile

By Wierzbowsky

Guardian (3648)

Аватар пользователя Wierzbowsky

22-02-2021, 18:55

The board has distinct markings for what ICs belong to FMPAC and what belong to port F4. The chips are basic logic ICs that are sold in any decent electronics store and on Ebay. Aliexpress has plenty of them. Good that you found the parts you need.

By ddehaan

Expert (73)

Аватар пользователя ddehaan

23-02-2021, 15:56

Look at the board a little closer and figured it out Smile I could not find IC2 and IC3 on Aliexpress in a D variant. I ordered the normal variant, but they don't fit (pins don't line up) Smile Good thing Aliexpress is cheap Smile

Found the IC's and i am waiting for them. Rest of the board has been soldered. Curious if i'll get it to work Smile

Thanks for the help Wink

By galatronic

Supporter (11)

Аватар пользователя galatronic

13-08-2021, 22:05

Hi guys, I upgraded my 8235 to MSX2+ and I added this F4/FMPAC card today; I used the signals from the rear slot port and it works flawlessy, but I see that no other cartridge works in the rear slot now. Anybody know if there is a solution tu use the internal FMPAC card leaving free to use the rear slot port? thanks in advance

By hansgoos

Rookie (29)

Аватар пользователя hansgoos

30-10-2021, 16:31

Hello Dennis, did you manage to get this board installed in your NMS8250? And if so, would you maybe like to share some pictures of it? Thanks in advance.

By alali.ahmed.t

Master (194)

Аватар пользователя alali.ahmed.t

15-05-2022, 21:33

Hello Alexey,

I managed to assemble everything and connect all wires as I saw on the attached picture to this project. I am only confused about the part where to connect the AMP point according to the readme file on the document folder. The line says:

"The AMP pin of JP3 must be only connected to the mixer point of the internal amplifier, where all other SNDIN pins of cartridge slots are connected to"

Then there is:

"The SLT pin of JP3 must be only connected to pin 49 (SNDIN) of any cartridge slot. On Yamaha MSX2 YIS503 and similar computers the best place to connect the SLT pin is pin 59 on the side slot."

On the picture above, I don't see any wire coming out of the AMP on JP3. That confuses me!

I have the Japanese YIS-503II converted to MSX2+

By Wierzbowsky

Guardian (3648)

Аватар пользователя Wierzbowsky

15-05-2022, 22:01

Pin 59 of the side slot. See white wire:

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