F4/FMPAC Light Combo Board project

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.

Hi Alexey,

I still have a few questions 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 If the backside isn't needed for the FM Pac portion, i don't have to get them

I also couldn't find a

Kind regards,
Dennis

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.

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

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+