Pls help me to upgrade my msx 8245

بواسطة raizing77

Supporter (3)

صورة raizing77

11-04-2018, 22:25

good morning
can someone help me ?
I would like to modify my msx2 philips 8245 in msx2+
I already have a v9958 chip
I also have an old scheme for editing it but I do not have the image of the bios
can someone who has my model send me the image by e-mail?
you could tell me what eprom model i have to buy?

Thx

raizing77@gmail.com

a last request
someone and managed to make the change of the f4 register on 8245?
do you have a schematic a photo guide?

Thx

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بواسطة Wierzbowsky

Guardian (3568)

صورة Wierzbowsky

11-04-2018, 23:37

The easiest way is to solder an F4 mini board on top of the Z80. Installing an F4/FMPAC combo board could be more challenging. But I heard that someone has done this for Philips machines.

بواسطة RetroTechie

Paragon (1563)

صورة RetroTechie

12-04-2018, 03:55

Welcome here.. mail sent!

Best start with V9938 -> V9958 upgrade. There's several software that uses a V9958 even if machine identifies as a regular MSX2. Note this upgrade is not a 1:1 drop-in! Function is changed for a few pins. And (de-)soldering skills required. Smile

I've read that someone did an MSX2+ upgrade on this machine without F4 register, and using same 64KB ROM size. But of course this comes with limitations. Iirc something like no MSX2+ logo, RAM-wiping hard reset always. Or something like that. But still a useable MSX2+ machine.

For same-size system ROM replacement, you need a 27C512 (64K * 8 bit EPROM). Speed grade -15 or faster recommended.

بواسطة raizing77

Supporter (3)

صورة raizing77

12-04-2018, 20:34

Hello thanks for the file ..

this image is the original one of msx2 8245 or was created for editing at 2+ ?

I expected a bigger image with dos 3.0 and the kanji rom

بواسطة raizing77

Supporter (3)

صورة raizing77

12-04-2018, 20:39

this f4 card where can I buy it?

بواسطة Wierzbowsky

Guardian (3568)

صورة Wierzbowsky

12-04-2018, 20:54

raizing77 wrote:

this f4 card where can I buy it?

Maybe someone still has those bare or assembled boards. But I ran out of them a few months ago. You should ask on the "Trading and collecting" forum. These are the F4 boards I mentioned:

https://www.msx.org/forum/msx-talk/hardware/f4-port-board-msx2

If you want an FMPAC/F4 combo board, then all the sources are here:

https://github.com/RBSC/F4-FMPAC

بواسطة Pablibiris

Paragon (1815)

صورة Pablibiris

12-04-2018, 21:47

Hi!
I have one board of FM + F4 register assembled Smile
I have one installed un my NMS8245 and runs perfect!
If you want It,Contact to me: pablibiris (at) msn (dot) com
Nice work of RBSC team!

بواسطة rolandve

Champion (324)

صورة rolandve

06-05-2020, 22:51

I've got a NMS 8245 that is going to get surgery in the near future. This FM+F4 register looks nice. Are these boards for sale somewhere? I would like a completely assembled version. This (to me) looks like an upgrade everyone should have unless FM-PAC music causes problems with software or systems.