SpritesMind.Net

Sure

Did some probing on my model 1 va2. It has a 5308 arbiter, a 5309 IO chip and a 5345. I checked the pinouts on MegaDrive.org and found some inaccuracies. Correct pinout is as follows:

1. /BGACK (connected to BGACK on VDP, 68k and arbiter)
2. /HSYNC
3. /SRES
4. A14
5. /M3
6. /OE0
7. MCLK
8. GND
9 ...

You can't specify the order unless to specifically include a file in the section (but you shouldn't except for the startup code).

Why do you care about the order ?

KanedaFr wrote:

Code: Select all

.hack 0x000FFB20:
  {
/* nothing here, if I add file.o, it won't work */
  } >rom =0xFF

Should be :
With eventually some align if the section before and after aren't aligned.

nm, works at the ELF level (or a.out/whatever but not binary).

Stef wrote:I never saw that ?= syntax in makefile, i though you could override any variable by simply affecting it again. What does that notation exactly do ?

It means set if not defined

SHELL?=$(BIN)/sh

is equivalent to :

.ifndef SHELL
SHELL=$(BIN)/sh
.endif

Ideally the sega.o must be in the ld script, that's what I've done in my setup.

You said in another thread that you will not maintaining Linux build of Exodus.
Let say I take your source when it will be available and I port it to Linux (well FreeBSD in my case but let's say port it to X11/GTK/Whatever) and for some reason you don't want to commit my changes to the official ...

So, I'm planning to release Exodus as open source sometime soon. There is the looming question of which license model to use though, and I'm currently undecided on which direction to take. There are a few things I know I want the license to do:

-Must not allow free commercial use. That said, I'm ...

Oh yeah I didn't see those scans, thanks.
I guess that those pins are the ones still unknown on the 315-5313, did you test this on a MD1 too ?

This is weird that the VSRAM is unaffected as there is a /SE1 line.

How does this work electrically speaking ?
Is there a /RAS2 and /CAS2 pins on the VDP which select another pair of ram chips ?
Does the vsram is doubled too in this mode ?

Anyway, thanks for this awesome information.

http://wiki.megadrive.org/index.php?title=315-5433

Here you go.

Still miss 4/5 pins but ...

Hello tristanseifert,

As you know I have a wiki too about md dev.
I've seen that you've decided to do like me and provide chip pinouts.
Problem is you probably copied some info from my wiki cause you have an error that I've made on the 315-5309 diagram.
I've corrected mine so feel free to update ...

I see that you've enabled the display but have you unlock the VDP by writing 'SEGA' to 0xA14000 ?

I've started to recreate the page : http://wiki.megadrive.org/index.php?title=Connectors