Search found 35 matches

by tcdev
Tue Apr 12, 2011 4:30 pm
Forum: Megadrive/Genesis
Topic: Super Magic Drive research thread
Replies: 133
Views: 57085

SMD BIOS running under an emulator

That's interesting news indeed! I was thinking of porting Space Invaders to the SMD, using the VDP for the graphics, but wasn't sure if there was an emulator that could readily execute the SMD BIOS code... Another possibility I thought of was porting the MSX version of Lode Runner, which uses a simi...
by tcdev
Sat Feb 05, 2011 6:02 am
Forum: Megadrive/Genesis
Topic: Super Magic Drive research thread
Replies: 133
Views: 57085

KanedaFr wrote:tcdev, I make a mirror of your file. Tell me if you're ok, else I'll delete it
http://gendev.spritesmind.net/files/bsy ... v3.lst.pdf
No objections from me!

And thanks for those other analyses!
by tcdev
Wed Feb 02, 2011 11:52 am
Forum: Megadrive/Genesis
Topic: Super Magic Drive research thread
Replies: 133
Views: 57085

I think you should write up a summary of the changes in each version (perhaps just formalise what you have already posted) and have Charles add it to his SMD documentation. It would be nice to have this collated in one coherent location for future readers. [OT: had a crazy idea, but I think I have c...
by tcdev
Wed Feb 02, 2011 10:20 am
Forum: Megadrive/Genesis
Topic: Super Magic Drive research thread
Replies: 133
Views: 57085

Would be interested in PDF listings of other versions - yes! :)
by tcdev
Sun Jan 30, 2011 11:35 pm
Forum: Megadrive/Genesis
Topic: Super Magic Drive research thread
Replies: 133
Views: 57085

about, SRAM, I'm trying to understand CAS et RAS.... when !RAS, it means you're sending MSB of address (A5 to A9) and when !CAS you're sending LSB (A0 to A4) ? I'm assuming you really meant DRAM... not SRAM... CAS stands for Column Address Select and RAS stands for Row Address Select. I'm not famil...
by tcdev
Sun Jan 30, 2011 6:23 pm
Forum: Megadrive/Genesis
Topic: Super Magic Drive research thread
Replies: 133
Views: 57085

see http://gendev.spritesmind.net/img/smd/P1060030.JPG and http://gendev.spritesmind.net/img/smd/P1060031.JPG for HD pic Second, there is ugly green and brown color everywhere so I suspect it needs some cleaning! It still doesn't explain why it's unable to load a game from cart... I'll try to find ...
by tcdev
Wed Jan 26, 2011 2:12 am
Forum: Megadrive/Genesis
Topic: Super Magic Drive research thread
Replies: 133
Views: 57085

Thats a rough description, but the accurate signal timings and relationship with inputs and the current state is what its needed. Obviously. Even if the chip was readable, what would we do with with the jedec file? Is the internal physical layout known? « for porting into a more recent IC I don't t...
by tcdev
Wed Jan 26, 2011 12:09 am
Forum: Megadrive/Genesis
Topic: Super Magic Drive research thread
Replies: 133
Views: 57085

Jorge Nuno wrote:So the only solution is to figure out what it does exactly and get a new replacement part. Good luck
I wouldn't be surprised if Charles could already tell you exactly what it does. AFAIK it's primarily address decoding, byte-lane steering, chip-select generation and DRAM refresh control.
by tcdev
Tue Jan 25, 2011 11:59 pm
Forum: Megadrive/Genesis
Topic: Super Magic Drive research thread
Replies: 133
Views: 57085

KanedaFr wrote:It would be cool to be able to dump Altera code, so anyone could burn a new one if damaged....
Unless it's possible to dump it, this part can't be fixed :(
AFAIK you can't buy them anymore anyway...
by tcdev
Sun Jan 23, 2011 6:59 am
Forum: Megadrive/Genesis
Topic: Super Magic Drive research thread
Replies: 133
Views: 57085

KanedaFr wrote:I was unable to find the datasheet for the MCCS3201FN....if someone find it, let me know ;)
<http://www.datasheets.org.uk/Scans/Scan ... 38509.html>
by tcdev
Thu Jan 13, 2011 12:15 pm
Forum: Megadrive/Genesis
Topic: Super Magic Drive research thread
Replies: 133
Views: 57085

BTW - and this is completely off-topic and of little interest to anyone - but... The whole thing that got me started with this was reading an article in Retro Gamer magazine a week or 2 ago about "Mickey Mouse - Castle Of Illusion" (yes, I'm a bit behind on reading it). They waffled on for so long a...
by tcdev
Thu Jan 13, 2011 12:07 pm
Forum: Megadrive/Genesis
Topic: Super Magic Drive research thread
Replies: 133
Views: 57085

in fact, it's why I gave you the link... I read (somewhere!) the first version of SMD was buggy...but I don't know what part exactly... for what bios version to use, I don't know....I was looking for one which does RAM test but it doesn't seem to exist (until someone make one!) I'll try to use Char...
by tcdev
Thu Jan 13, 2011 3:41 am
Forum: Megadrive/Genesis
Topic: Super Magic Drive research thread
Replies: 133
Views: 57085

Well, the drive read issue is sorted. But I have no idea why... :? I've tried BIOS v3.1g, 3.3 & 4.1. They can all read from the drive no problem. BIOS v3, the version I disassembled, and which incidentally was installed in my SMD, simply refuses to read disks. Even after I patched out the 'signature...
by tcdev
Wed Jan 12, 2011 2:10 pm
Forum: Megadrive/Genesis
Topic: Super Magic Drive research thread
Replies: 133
Views: 57085

I'm releasing my disassembly of the SMD v3 BIOS tonight: http://members.iinet.net.au/~msmcdoug/consoles/smdv3.lst.pdf Note that it is not complete, and probably contains errors. I am releasing it now because I'm off to Vegas for 2 weeks for work, and won't get any chance to do any more of it for a w...
by tcdev
Wed Jan 12, 2011 3:49 am
Forum: Megadrive/Genesis
Topic: Super Magic Drive research thread
Replies: 133
Views: 57085

The good news is that I've fixed my DRAM problem. When I repaired the battery damage on my board, I neglected to notice that a few of the pins in the DRAM daughterboard connector were corroding. I replaced the connector on my SMD PCB and now it shows "RAM 8M" :D The bad news is that I still cannot g...