Dumping/reverse engineering MSX models thread

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By mars2000you

Enlighted (6019)

mars2000you's picture

14-02-2021, 16:28

There is a chip on the underside of the PCB, a VLC9007, no idea what it is exactly.

http://www.retropix.com.br/wp-content/uploads/2017/05/DSC_02...

More pictures here: https://www.retropix.com.br/olhando-dentro/msx-sanyo-mcp-3-w...

By DamnedAngel

Master (233)

DamnedAngel's picture

14-02-2021, 19:24

Oh, I forgot about that one. My bad.

I have no idea on how to test it, though. If someone has any idea let me know

By sdsnatcher73

Prophet (2367)

sdsnatcher73's picture

27-02-2021, 13:22

I just discovered something odd regarding Kanji ROMs on my PHC-77 (and possibly also on HB-T600 that I reported earlier having issues with the Kanji ROM). It seems flash cartridges are interfering with the on board Kanji ROM. At least Carnivore2, GR8NET and Flashjacks are causing this issue on the PHC-77. See photos of the onboard MSX-Write with the flash carts inserted and 1 with RDNX (which is simpler and this does not interfere).




By Manuel

Ascended (18256)

Manuel's picture

06-03-2021, 13:15

We noticed that in the Sanyo PHC-77, MSXMEM reports a 0kB memory mapper.

Theory is that this is caused by having no memory mapper, but still an S1985 in the system, which implements part of the memory mapper registers anyway.
I know of the following machines that have S1985 but no memory mapper:
National FS-4500
National FS-4700
National FS-5500F1
National FS-5500F2
Panasonic FS-A1
Sanyo PHC-23JB
Sanyo PHC-77

It would be useful to find out how this works exactly. As Wouter put it:

Quote:

If it is indeed because of the 0xfc-0xff IO ports, and if so, how exactly do those port behave?
My best guess: the lowest n bits of those ports reflect the last written value to those ports and upper bits always read as '1'.
To test in BASIC: OUT &hfc,0 : print inp(&hfc)
or try with some other values than '0' and maybe confirm with another port in the range 0xfc-0xff

Can someone who has any of these machines help with this?

By Vyper68

Rookie (18)

Vyper68's picture

28-05-2021, 11:43

Hi,
I recently bought a Toshiba HX-22GB and have now bought a FDC-600 disk interface to use with my Gotek drive. I am trying to save the ROMs using SaveRom.com and have dumped Slot 0 ( 0000-ffff ) and Slot 3-0 ( 0000-ffff ) but when I try to dump Slot 3-3 my system hangs. The HX-22GB has the same memory/slot map as the HX-22I so the I think the Word processor and RS232 Basic might be in Slot 3-3.
Internally it has two 32KB mask roms so I would like save both if possible.

By sergarbes

Expert (98)

sergarbes's picture

07-07-2021, 08:30

Yesterday I began the dump of the HB-F700S MSX2 ROMS. I'll keep you informed. Cool

By sdsnatcher73

Prophet (2367)

sdsnatcher73's picture

07-07-2021, 09:26

sergarbes wrote:

Yesterday I began the dump of the HB-F700S MSX2 ROMS. I'll keep you informed. Cool

Cool! thanks...

By gdx

Enlighted (4833)

gdx's picture

07-07-2021, 11:01

I remember seeing in a thread that Carnivore2 also interferes with the MMM.

By Pencioner

Scribe (1480)

Pencioner's picture

07-07-2021, 11:10

gdx wrote:

I remember seeing in a thread that Carnivore2 also interferes with the MMM.

Not exactly. Carnivore implements the same additional registers as MMM so vgmplay have false positive and tries to use Carnivore to enable sound chip (if in lower slot than MMM) which doesn't work and you have no sound then. Otherwise they both work fine on the same computer

By gdx

Enlighted (4833)

gdx's picture

07-07-2021, 12:02

Which is annoying for other functions.

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