Panasonic FS-A1 propietary firmware (DESKPAC) bypass by hardware modding. Can be done?

By f1r3b0y

Supporter (5)

f1r3b0y's picture

21-06-2017, 21:01

Hi, just adquired a MSX2 Panasonic FS-A1 black from As I have a MFR cart, it's very annoying to keep DEL key to bypass the firmware utilities included on this computer, as when you press F8 to go BASIC it reboots again, so to get the MM I have to wait about 3 resets.

It's there a way to disable that utilities? I will not use them in any way, as I don't speak japanese. Cutting some pin, a jumper, etc...

In later series of Panasonic computers they have a switch to permanently disable those utilities, but on the 1st ones is very frustrating.

Thank you in advance for your help!!!



Login or register to post comments

By f1r3b0y

Supporter (5)

f1r3b0y's picture

22-06-2017, 01:32

Also, I have a Sony HB-F1 with same issue. The problem is that I don't want to remove as perhaps will lose the secret animation pressing Y and P while booting.


By gdx

Prophet (3168)

gdx's picture

10-11-2017, 00:05

You need to replace the original 128kB ROM with another 64kB.

Original Rom contains in order: Main-ROM, Sub-ROM, an empty area of 16kB and the Firmware of 64kB.

I already changed the Rom in my Panasonic FS-A1. I used an eeprom W27C512-70.

By f1r3b0y

Supporter (5)

f1r3b0y's picture

29-04-2018, 22:22

Thanks a lot @gdx. Will buy some eeproms and test my old burner!!!

By odaman68000

Rookie (22)

odaman68000's picture

12-05-2018, 07:27

Or you can do it with simple hardware modification.
Just with 74LS10 logic IC, kills slot#3-2 and slot#3-3 signal.
But it should access to MSX-SYSTEM (S1985) chip, and its pins are very small, so it's very difficult to soldering.

Do you want to try this?