Dumping/reverse engineering MSX models thread

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By Patrick

Supporter (14)

Patrick's picture

04-05-2020, 09:17

Manuel wrote:

Thanks. What is exactly in these slots? Did you use a cartridge to dump it? Which?

I used a Sony HBD-50 disk drive. No extra hardware so slot 0 is BASIC/BIOS, slot 1 RAM and slot 2 FDD interface.
I am confident that is the same ROM as Yeno DPC-64: mine needs repair, but the ROM's marking are identical except the date code.
If I can repair my DPC-64 I will try to confirm this.

By Manuel

Ascended (18126)

Manuel's picture

04-05-2020, 12:41

@Patrick can you also run the other steps of the reverse engineering process? They are documented in the readme file in the tools zip file of the original post in this forum thread.

By sdsnatcher73

Prophet (2220)

sdsnatcher73's picture

04-05-2020, 18:12

Manuel wrote:
sdsnatcher73 wrote:
xesco wrote:

Dumps of System ROMs can be found here

Added many photos of internals and screenshots of execution results for all the tools. Only missing part is keyboard matrix which requires pressing combinations of keys and taking pictures at the same time which is not possible by myself :)

From your rom dumps and the existing YIS-805/128R2 machine config I created a machine config and systemroms. I bundled them here.

I guess you quoted the wrong post... xesco had VG 8020/40 ROMs. I assume you used the Yamaha YIS-805/256 dumps. But I don't think it's wise to base the machine on the Russian YIS-805/128. It might be quite different, despite the name.

Well I don’t think those machines are very different, most likely just ROM difference, markings on the case and the keyboard.
We could confirm this with some photos of both models (there appear to be no images of the mainboard of the Japanese model. However on the Russian model you can see this machine has the connector on the mainboard for the video expansion that only the Japanese model actually has exposed on the back.

By pgimeno

Champion (300)

pgimeno's picture

04-05-2020, 22:49

bsittler wrote:

I am also curious about the YM2220, is its color palette known? And can it be switched to NTSC and/or 60 Hz somehow?

I've worked on the colour palette a bit, see here: https://www.msx.org/forum/msx-talk/hardware/unknown-vdp-yama...

There's possibly a pin that decides the frame rate. I learned that in the thread above.

I can't say much for your other questions, sorry.

By pgimeno

Champion (300)

pgimeno's picture

04-05-2020, 22:54

Edit: never mind, I was replying to something already answered

By Manuel

Ascended (18126)

Manuel's picture

05-05-2020, 00:30

Manuel wrote:

@Patrick can you also run the other steps of the reverse engineering process? They are documented in the readme file in the tools zip file of the original post in this forum thread.

Also, are you sure that RAM isn't in slot 2? The motherboard picture on MSX.org labels the cartridge slot EX1 and the expansion port EX3.

By Patrick

Supporter (14)

Patrick's picture

05-05-2020, 08:39

Manuel][quote=Manuel wrote:

Also, are you sure that RAM isn't in slot 2?

Absolutly not.

By Manuel

Ascended (18126)

Manuel's picture

05-05-2020, 13:15

Can you run msxmem, the ident tool and the other tools on the machine? Vdp type isn't known either for this machine, for instance. Tools and readme with instructions are here: http://frs.badcoffee.info/files/MSX_machine_reverse_engineer...

By Patrick

Supporter (14)

Patrick's picture

05-05-2020, 18:56

I will do this in the next.

By Manuel

Ascended (18126)

Manuel's picture

05-05-2020, 21:26

Thanks!!

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