MSX2 Panasonic FS-A1F wiki tutorials

Door Pac

Guardian (6396)

afbeelding van Pac

25-01-2014, 00:28

Recently, the Spanish user Aquijacks purchased this model of MSX2 and he decided to expand it to max specs. As the computer was improving step by step, he was writing an specific tutorial explaining each process. So, summarizing the steps were:

- Restoring a Panasonic MSX2 FS-A1F
- Converting Panasonic MSX2 FS-A1F to MSX2+
- Expanding Panasonic MSX2 FS-A1F to 512KB of RAM
- Adapting USB and 3.5" floppy drives
- Converting MSX2 FS-A1F to 230V
- Adding FM chip to MSX2 FS-A1F
- MSX2 FS-A1F misc, wiring, connections, etc…

From the MRC Spanish site, we thought that these tutorials may be of interest to the MSX community so we have decided to translate (thanks to tranx) and share them using our DIY section of the wiki (thank you Jorito&Manuel for help ;) ). At the moment only the first one is available here. As soon we have more, we'll let you know.

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Van Pac

Guardian (6396)

afbeelding van Pac

23-02-2014, 12:22

2nd tutorial added to the wiki thanks to Aquijacks and tranx. This time it's not related to the MSX2 FS-A1F modding but how to make your own flashrom 512k cartridge.

Van Thier

Supporter (4)

afbeelding van Thier

20-09-2018, 19:39

Hi,

I'm working on converting Panasonic MSX2 FS-A1F to MSX2+. The mod V9958 is already done and the MSX boot and still alive.
The next step is removing the BIOS rom...
I made a translation via google from the tutorial, I'm not intesseted to have a switch and have two BIOS in one and I want to keep the 128K ram. So, my question for my little project is if I remove only the BIOS rom and make a new one with using a M27C512?

0000-7fff basic-bios from FS-A1FX (32Ko)
8000-bfff subrom from FS-A1FX (16Ko)
c000-ffff diskrom from FS-A1F (16Ko)

will my project be ok , or I miss something like removing the little bro (PROM) beside of the bios rom on the motherboard. Somebody can help me for my little project?

Thx

Van gdx

Enlighted (4695)

afbeelding van gdx

21-09-2018, 02:35

According the link below the DA531P336616-0 contains the Kanji-ROM. The DA1024D0365R (128kB) contains the Main-ROM (Bios+Basic), Sub-ROM, Disk-ROM, Kanji driver and the Firmware (A1 Cockpit). If you remove the Firmware (32kB) the data exceeds 32kB if you use a 27C512. You must use a 27C010 and lift a few pins to put it in this MSX.

https://github.com/openMSX/openMSX/blob/master/share/machine...

Van Thier

Supporter (4)

afbeelding van Thier

22-09-2018, 06:50

Hi,
About using a 27c010, I left pin 1, 2, 32 and 31, then I wired together pin 1, 32, 31 and 30. (With the 27c512, my plan was much easier, but anyway I needed the kanji driver.) So is it the way to use the 27c010?

Please let me know,

Thx

Van gdx

Enlighted (4695)

afbeelding van gdx

22-09-2018, 11:09

I think you have to lift pins 1, 2, 30, 31, and 32 (see picture). Pin 1 must be not connected. Use a socket!

According the slot map, you can replace the firmware by Basic-Kun compiler for example.

Van gdx

Enlighted (4695)

afbeelding van gdx

22-09-2018, 13:13

Sorry, I made a mistake of chip to explain. Pin 1 and 31 must be not connected. I think pin 30 can stay down because it is not connected inside.

Van Thier

Supporter (4)

afbeelding van Thier

28-10-2018, 21:20

Thx GDX, Sorry for the delay. I will work on soon on my Panasonic. Smile

Van Alexey

Guardian (3204)

afbeelding van Alexey

07-07-2021, 03:52

I just modified the A1F to remove the firmware. Remove (desolder) the right ROM (IC18), leave the other ROM on board. Dump the removed ROM as if it would be a 27C512 chip. You will get a 64kb image with BIOS, Basic, Subrom and Disk ROM. Burn this dumped image into a W27C512 EEPROM or 27C512 EPROM. Install the programmed chip where the desoldered ROM used to be. Done!

You can also easily upgrade the RAM to 128kb by putting 2 DRAM chips of 4464 series as IC14 and IC16. Don't forget to add 2 ceramic caps 100nF each as C49 and C51. No other modifications are needed.

Van Grauw

Ascended (10063)

afbeelding van Grauw

06-07-2021, 20:42

Alexey wrote:

You can also easily upgrade the RAM to 128kb by putting 2 DRAM chips 4464 as IC14 and IC16. Don't forget to add 2 ceramic caps 100nF each as C49 and C51. No other modifications are needed.

I wonder if that was a common mod in Japan. In Europe it was quite common to make such modifications, but I don’t think I’ve ever seen a modded MSX on Japanese auction sites?

Van Parn

Hero (652)

afbeelding van Parn

07-07-2021, 15:53

Mine was modded by my friend @l_oliveira. It has 1MB RAM (he added a small circuit to help drive the extra 512kB) and Basic-kun in place of the dreaded firmware. I love this machine, it's truly a workhorse. The only thing missing, imho, is some kind of turbo, but other than that it can handle anything I throw at it with aplomb. It's good to see how much people appreciate the A1F.