F4/FMPAC Light Combo Board project

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By alali.ahmed.t

Resident (49)

alali.ahmed.t's picture

15-05-2022, 22:22

I have another question,

How to test if the FMPAC + F4 are both working?

By Wierzbowsky

Guardian (3431)

Wierzbowsky's picture

16-05-2022, 11:14

Just run Aleste or some other game that supports FMPAC.

If you press reset button on your MSX, there should be no logo if F4 is working correctly.

By sdsnatcher73

Prophet (3395)

sdsnatcher73's picture

16-05-2022, 12:14

Correction, with the reset button you should see the boot logo. A soft reboot (initiated from software) should not show the logo. That is how it works on all original MSX2+ machines.

By alali.ahmed.t

Resident (49)

alali.ahmed.t's picture

16-05-2022, 19:04

Alexey wrote:

Just run Aleste or some other game that supports FMPAC.

If you press reset button on your MSX, there should be no logo if F4 is working correctly.

I will check it out. One more thing, there are optional capacitors on the board, I just didnt install them. I am assuming all good Smile

By alali.ahmed.t

Resident (49)

alali.ahmed.t's picture

16-05-2022, 19:07

sdsnatcher73 wrote:

Correction, with the reset button you should see the boot logo. A soft reboot (initiated from software) should not show the logo. That is how it works on all original MSX2+ machines.

I have been seening the logo with the Russian MSX2+ Bios rom and Russian EXT + Kanji rom. So, I can't tell really. But, when I installed the Japanese version since I needed Qwerty layout, the logo will come out after reset too. So, I will assume it is working Cool

By Wierzbowsky

Guardian (3431)

Wierzbowsky's picture

16-05-2022, 21:31

Optional capacitors cut the high frequencies a bit. If you feel that your FMPAC has too much high frequencies, install 470pF capacitors to optional spaces.

By alali.ahmed.t

Resident (49)

alali.ahmed.t's picture

17-05-2022, 05:53

Alexey wrote:

Optional capacitors cut the high frequencies a bit. If you feel that your FMPAC has too much high frequencies, install 470pF capacitors to optional spaces.

Alright, Thanx for the explanation.

Now, am I not suppose to see the FMPAC on one of the slots? I ran MSXMEM and as you can see on the picture, I dont see the FMPAC on any of the slot 3, I only see RAMs on Slot 3-2. Does that mean the circuit doesn’t work?

Any other app or way to test functionality other than the sound of the games?

I tried CALL FMPAC on basic but it didn’t recognize it

https://drive.google.com/file/d/1Cg76dBS3JBGqDZz0D6t3WL7HBN9...

By Wierzbowsky

Guardian (3431)

Wierzbowsky's picture

17-05-2022, 19:09

Try running a few of those files on your computer from Basic:
https://parn.pro.br/musicstation/pmd1.zip

Did you connect the FMPAC board to the front slot with 2 wires and set the correct solder jumpers for the EPROM chip? See my picture in the earlier post for the correct wiring.

FMPAC BIOS should be visible as "C" in subslot 3.1, page 1. You don't have it mapped.

By alali.ahmed.t

Resident (49)

alali.ahmed.t's picture

19-05-2022, 05:59

Alexey wrote:

Try running a few of those files on your computer from Basic:
https://parn.pro.br/musicstation/pmd1.zip

Did you connect the FMPAC board to the front slot with 2 wires and set the correct solder jumpers for the EPROM chip? See my picture in the earlier post for the correct wiring.

FMPAC BIOS should be visible as "C" in subslot 3.1, page 1. You don't have it mapped.

Unfortunately, I will have to wait until new boards arrived, I was trying to do some changes to some of the parts and the pads that parts sits on came out in the last board I had.

How do I run FM files on basic? If I put the files on the carnivore,wouldn't carnivore interfere to use the FMPAC it has to play them?

Where Should I put the file? and what command I should use including the directory ?

Finaly question,

I noticed that in the notes it says that I have to use RD signal for JP2 if I am using 512 chip, but when I look at the schematic that pin is actually CS1. On JP2 it is RD/CS1 so, is that the same? or do I have to pull a wire all the way from pin 21 of Z80 chip (since pin 21 is RD on Z80)?

By Wierzbowsky

Guardian (3431)

Wierzbowsky's picture

19-05-2022, 13:07

For Carnivore2 you can create a configuration entry to exclude FMPAC and only keep RAM and IDE for example. Use the C2MAN utility to create that entry. This way you can use the internal FMPAC. FM files are actually .bas files, so run them as normal basic files: run"file.fm"

The FMPAC BIOS is a combined one (internal + external). For the correct placement of the BIOS in the slot, you need to follow the instructions. If you use 27C256, then just write the "combined.rom" into the chip and use CS1 pin, but when using 27C512, you need to write the ROM file twice into the chip (make 64kb file by adding 32kb file to itself) and use the RD pin.

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