New portable MSX / MSX2

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By sdsnatcher73

Prophet (2363)

Аватар пользователя sdsnatcher73

07-09-2021, 09:37

For cartridge based games that would certainly be enough. But this way you exclude a lot of games. I tried for instance to run MFR SCC+ SD on C-BIOS but it does not work (it needs MSX Basic). Maybe the ROMs could be flashable in someway (so you can deliver it with C-BIOS ROMs but end user can flash normal MSX2 ROMs)?

By MsxKun

Paragon (1038)

Аватар пользователя MsxKun

07-09-2021, 15:19

Manuel wrote:

MsxKun: well it's a bit nasty to state (as a fact) that "it gives many troubles" without even having reporting one (at least, as far as I know); and worse not being able to mention even one concrete issue. We have once run C-BIOS on a Philips NMS 8245, and it worked fine, as far as I remember. There used to be once an issue with too fast VDP access. Perhaps that's what you think about. But that was fixed in 2014 or so.

Sorry had to write "It gave me many troubles". And it did, I won't lie to you telling the opposite. Happy if now it works fine.
2014 seems like yesterday to me, but I'm pretty much sure it wasn't about VDP access cause as much as I like to keep using the BIOS, for VDP most of the time I skip it. Closer maybe, it could be about free vblank time (by too short or too long) compared to a "normal" MSX-BIOS (and sure, different BIOS leave different time when it's diferent MSX generations). So in the end, *if that was it* maybe it was working as intended, but as no real MSX uses that, it was pointless to test more. So no, I never reported, as it's only used on emulators (afaik) and I'm not emulator user, I just ignored it back then to focus only on the real machines. It was more time-effort profitable. That simple. I hope you understand I can't report any bug I find on all my systems and stuffs, specially about something I'm never going to use. And, if you ask people who I report bugs, they will probably say I should take it as a rule, avoid any reporting at all Running Naked in a Field of Flowers

Don't get me wrong and don't take it personally (in fact I have no idea who made C-BIOS, sorry), but I think c-BIOS is a good thing to have but, for my needs, pointless to use (yet). Happy if it serves to someone else. It could be the one for this project. For me it's more practical to just use the ones which I can test later on real hardware. It's a matter of needs and a little bit of time-optimization on my life full of procrastination.

By Caliostro

Expert (80)

Аватар пользователя Caliostro

08-09-2021, 20:56

I'm looking at the OMEGA MSX schematic, a modern component (AS6C4008) was used for the RAM memory, instead I could use a component I have at home is62c1024al-35qli?
I can note though that D41464s are used for VRAM, is there a reason not to use modern SRAMs? Can I use is62c1024al-35qli for VRAM too?

By sdsnatcher73

Prophet (2363)

Аватар пользователя sdsnatcher73

09-09-2021, 06:12

Check this thread. It discusses using SRAM on V9938.

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