Fixing Panasonic FS-A1 MK2 firmware issues | MSX Resource Center (Page 3/4)

By Sebbeug

Champion (397)

08-10-2019, 14:50

@l_oliveira : interested about your rewrited rom for an MSX2+ upgrade on my FS-A1...

By l_oliveira

Hero (534)

10-10-2019, 15:26

This is the ROM I use to upgrade A1F to MSX2+
128KB image for A1F 2+ with turbo basic rom

By Sebbeug

Champion (397)

10-10-2019, 16:01

Thank you so much

By pocketpocket

Supporter (2)

14-11-2019, 11:33

Interested in trying this myself but I have a FS-A1 without the Kanji ROM. Is there a way to insert a Kanji ROM into an A1? If not, what kind of compatibility issues would I run into without it? Thanks for your time

By Josevil

Master (199)

01-03-2021, 22:22

l_oliveira wrote:

This is the ROM I use to upgrade A1F to MSX2+
128KB image for A1F 2+ with turbo basic rom

hello I am trying to mount the mk2 but with two eprom the first with the msxbasic and the msx2pext (48k) and the second epromm with the kanji.
what your 128k epromm is made of.

you have the loose files and I put them together to be able to record them in the epromm

my idea is to use the two banks of epromm with two m27c512

By sdsnatcher73

Prophet (3849)

02-03-2021, 04:40

The FS-A1mk2 has no kanji ROM. In my FS-A1mk2 the 128kB ROM holds main BIOS, sub BIOS, RTC reset (those add up to 64kB) and 64kB of the cockpit firmware. If you replace this with a M27C512 holding just main BIOS, sub BIOS and RTC reset ROM you can leave out the 32kB ROM.

I used FRS’ msx2newdrv BIOS for my machine (Alexey did all the work as I have 2 left hands, possibly more

By Josevil

Master (199)

03-03-2021, 08:38

The idea is to use the 128 way home, which is ready, but given the fact that it is practically empty, it would be to use only one of 64 boxes in each bank in the first bank to use it as it was prepared now in fact if I record the 128k one. 64 starts already as msx2 +. In the original tutorial the second bank is used for a 512k memory expansion. I have used some BIOS that I have recorded AND the mk2 I tried to access this bank at startup because it hangs. Before converting it to MS X2 plus I had it with a 64k BIOS only In which I had removed the copic only. The idea is to split the BIOS from msx2 + and try to put it in the two banks

If I had individual files or knew which computers they came from, I would look for them and mount them with the copy command. With the exacesimal editor of the epromm recorder I have not been able to because when I do the copy command I lose data as I have to drag the content with the mouse

the bios of msx2 + mk2 of 128k It comes from it comes from the a1fx ???

By Pegafun

Supporter (10)

03-03-2022, 16:40

NYYRIKKI wrote:

I don't know this machine, but reading the comments... Can't you just cut the pin 22 of original ROM and ground it? Do you really have to replace the whole chip?

gdx wrote:

I prefer the method that does not damage the original, when it is possible to put back as originally.

If I understand it correctly, I can think of another way to keep the original chip and be able to activate the original software when I was interested.
Could I lift pin 22 of the chip, wire it to the center pin of a three-pin switch with two ON-OFF positions, and the remaining two pins of the switch, one to GND and the other to the original position where the lifted pin was located?

By daniel683104

Paragon (1260)

24-03-2022, 20:04

Hi guys

I am trying to upgrade the panasonic FS A1Mk2 to MSX2+ I did the same way written on the great tutorial from Alexandre Souza. nevertheless the link with the rom at the end on the tutorial does not work to me.
I have used the firmware that L-oliveira posted some time ago some lines on top of this post. and after flash it and put it into the computer it happens as follows:

The computer turns on
MSX2+ Symbol appears
Memory is showed

but before the basic cames in, it hangs and leave the screen in blue.

any idea? or diferrent rom to burn into the eeprom (AM27C010).

Thanks

By sdsnatcher73

Prophet (3849)

24-03-2022, 20:32

The link from L_oliveira indicated it is for the A1F (which has a disk drive). Your MSX won’t boot with that ROM because it has no disk controller. You can try blanking the disk ROM in that combined ROM (it will start with ABowve (something like that at least ). Just write FF over that part (16kB). As a first try you could also overwrite just the AB