RISKY MSX Rev2

[arkadiusz.makarenko]

It turns out one of chips is damaged. It works fine on all other devices I have at home. There must be some internal issue with flash

[arkadiusz.makarenko]

@ahmsx Thank you for expanding on docs and building guide. I have included your PR in the main respiratory.

[ahmsx]

@ahmsx Thank you for expanding on docs and building guide. I have included your PR in the main respiratory.

Thanks.

I started to work on an acrylic case for the RISKYMSX cartridge.
I already assembled the first prototype, but added a few tweaks which I want to validate.

https://github.com/herraa1/msx-riskymsx-enclosure

[arkadiusz.makarenko]

So there is something unusual with this chip.

Some devices do allow fast erase and some don't.
It is not related to chip version as I can see the same behaviour on v303 and v307.
Page erase works always, block erase 32KB does on some.
It is fluffy rabbits mental! It drives me crazy that I can't make it work as I want and how it is described in producers docs.
On the other hand what should I expect from a chip which cost less than £2...

So it is that on some chips when I erase above 128KB flash using block erase whole chip got wiped. Like I would issue whole chip erase function.

[arkadiusz.makarenko]

I got it!

Flash can run up to 120Mhz main clock speed reliability at writes.
I run core at 144Mhz, so some can't handle it and crap out during flash erase operations.

There is section in docs about it so hopefully I should be able to fix it somehow.

[ahmsx]

I got it!

Flash can run up to 120Mhz main clock speed reliability at writes.
I run core at 144Mhz, so some can't handle it and crap out during flash erase operations.

There is section in docs about it so hopefully I should be able to fix it somehow.

Nice to hear good progress on the flashing front!

[arkadiusz.makarenko]

Yes. After following advice from docs everything works as expected now.

I will test some more this and will release it hopefully tomorrow.

[arkadiusz.makarenko]

[arkadiusz.makarenko]

@ahmsx New release allowing fast flashing.
https://github.com/arkadiuszmakarenko/R ... tag/v3.2.1

[ahmsx]

@ahmsx New release allowing fast flashing.
https://github.com/arkadiuszmakarenko/R ... tag/v3.2.1

Works fine here, thanks Arek.
Flashing large ROMs seems faster now (the smaller ones flashed already fast enough IMHO).

I looked at the datasheet for the CH32V30x and the typical flash endurance is about 80K (measured, not guaranteed) with a minimum guarantee of 10K.
So I think we can expect the RISKYMSX cartridge to last more than 20 years, even if we flash 10 full sized ROMs per day
Let's see if mine gets to the MSX GOTO60.