AX370 modifications

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Par h0ffman

Rookie (23)

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28-08-2021, 13:19

Is it possible to replace the bios in this system to turn it into a full MSX2+? I would guess the matching Sanyo Wavy would be the best candidate.

Also is it possible to add a 7mhz turbo circuit to this machine?

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Par rzookol

Supporter (10)

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04-02-2022, 13:38

Bumps this thread as i have the same issue. Sanyo Wavy70 has 2 eproms, AX370 has one. Does anyone have direct dump of this eproms from Sanyo and can tell which type of eprom it is?

Par jltursan

Prophet (2619)

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04-02-2022, 15:18

At least the AX370 has the empty sockets; so after identifying the right ROM set the replacement could be an easy task. Said that, in the Wavy 70FD dedicated page, the differences between FD and FD2 are shown, no idea about the ROM ICs tho. Seems that the FD2 has a bigger ROM due Kanji support.

The FD1/AX3700 seems to be at least a 256K one.

Par rzookol

Supporter (10)

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04-02-2022, 18:12

Right, emulator rompack for 70FD has:
Sanyo's Wavy PHC-70FD1 (MSX2+) (Made in 1988)
*ROM : Total : 256KB
MSX2PROM.ROM -->> MSX BIOS & BASIC Version 3.0
(Slot No. 0 : 0000-7FFF, 32KB)

MSX2PEXT.ROM -->> MSX Extended BASIC Version 3.0
(Slot No.31 : 0000-3FFF, 16KB)

MSX2PMUS.ROM -->> MSX FM Music BASIC
(Slot No,33 : 4000-7FFF, 16KB)

DISK.ROM -->> MSX Disk BASIC Version 1.0
(Slot No.32 : 4000-7FFF, 16KB)

MSXKANJI.ROM -->> MSX Kanji BASIC
(Slot No.31 : 4000-BFFF, 32KB)

KANJI.ROM -->> MSX Kanji Font (1st Class)
(I/O Address : &HD8-&HDF, 128KB)

BASICKUN.ROM -->> MSX Basic Compiler Version 2.0
(Slot No.33 : 8000-BFFF, 16KB)

but these roms are different files, should i join them before burning and is27c020 correct eprom for this.

Par rzookol

Supporter (10)

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11-02-2022, 20:47

Ok, i did:

copy /b 1_MSX2P.ROM+2_MSX2PEXT.ROM+22_MSX2PMUS.ROM+3_DISK.ROM+4_MSXKANJI.ROM+5_KANJI.ROM+6_BASICKUN.ROM out.rom

I used roms from Wavy70fd rom pack and it nearly work. I don't see MSX logo and FDD doesnt work (tested also ax370 disk rom - same result). MSX2plus basic starts ok, i can use kanji chars. Should i do something more to have FDD working?

Par sdsnatcher73

Prophet (3660)

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11-02-2022, 21:18

Do you see the Disk Basic after boot? Can you run MSXMEM.BAS, this will show us where all the ROMs are presented to the MSX (and then we can correct it if they are in the wrong place)

Par rzookol

Supporter (10)

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11-02-2022, 22:07

I have SD512 and it starts to Nextor without problem.

Par sdsnatcher73

Prophet (3660)

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12-02-2022, 07:11

So it is a bit messy it seems. It is showing C in slot 0-2 and 0-3 and even in 2-0, these should not be there. Slot 0 should not be expanded either but it may be related to the C’s. Anyway there is no D1 in slot 3 so that is why your diskdrive is not working…

Par sdsnatcher73

Prophet (3660)

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12-02-2022, 07:20

The issue is likely the AX370 does have slot 0 expanded usually, so what you can do is use saver to dump slots 0-1 to 0-3 and see what is in there, and find those in your concatenated ROM.

You can probably move the disk ROM into slot 0-1 for example but the FDC registers are probably not going to move automatically as well. You could also move Kanji rom to 0-1 (you may loose the boot logo but it can be recovered by fixing the sub rom, although we will need help to do it). If you then put the disk ROM into the location of the Kanji ROM (in your concatenation) the disk drive will work again. You may have to use some padding (empty 00’s for 16kB/32kB) here and there.

It’s a bit of a puzzle but enjoyable Wink

Par jltursan

Prophet (2619)

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12-02-2022, 10:50

AX370 Memory Map

Par Mudammir

Supporter (15)

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12-05-2022, 12:36

I am picking one up in the next few days but I have a question, was the AX-370 PAL or NTSC and what power does it need?

I am scared of getting one and plugging it here in Germany and completely frying it.

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