SpritesMind.Net

Based on what I've seen, I would set the same value to 0138 as you do for 0139. I haven't found where 0138 is set, but I'm sure it's there somewhere. The settings I gave for 0139 should be correct.

I think I missed a call for you. 0130 [A0] should set the volume to the correct level. SB is constantly setting the volume with this call, so I don't know if the value gets reset somewhere and this is how they counter it.

The video streams A & B should be basically the same, except only one of them ...

SHOOT THEIR PHASERS! :D

Here's my scouting report for Space Berserker.

As far as the data goes, it's just like an ordinary CD game. In fact, Space Berserker uses the same basic disc read routines as at least one other game: Lethal Enforcers. (There are probably a few others that use that code ...

I've finally fixed my dumper program! Huge thanks to TascoDLX for all his help. It's 1AM in the morning here right now, so I won't upload a full iso image of Space Berserker just yet, but watch this space! I'll also work more on the process for ripping the analog video and get that uploaded here in ...

There's loads of information at www.z80.info, but I'm not entirely sure it gets as detailed as you'd like it. Maybe it's buried somewhere in there -- I don't have much time to go digging. I remember seeing a bit of info on the Z80's T-states within each M-cycle, but nothing comprehensive.

In case you missed it, M68000 microcode/nanocode was briefly discussed here .

The M68000 patents are very thorough -- mind-numbingly so. They include all the nanocode (see US Patent 4,325,121 ) , somewhat distorted, but nevertheless spot-on. Must be read carefully, though. See also US Patents 4 ...

When I literally do all the exact same instructions as the sub-cpu bios app in both the _usercall0 and _usercall1 entry points, when I hit the very first bios call that gets made, which is $11F, it fails, and I'm starting to see a pattern here.
If you email me your binary, I'll take a look at it ...

Where do you get all this information? lol
It's all there in the bios. Just takes a little bit of time and a little bit of practice :wink:

I was looking for the overlay control, since right now, as soon as I boot the MegaLD sub-cpu bios I effectively lose picture, since the LaserDisk video layer ...

Yeah, I noticed the pausing when I was trying to record video from it on another player. I did need to step-frame in order to access the rest of the data.
Sounds like the video was mastered w/ picture stop codes. Some Pioneer players (and maybe others) have a setting to ignore them. Pioneer calls ...

Seems like I need to do something else to setup the hardware for a read before calling the ROMREAD bios functions.
Did you call DRVINIT first, and did it succeed without error?

There's some other stuff you can try calling beforehand that may or may not be helpful:
jsr $5f22 : d0.w = #$011F, d1.b ...

Loading the MegaLD sub-cpu bios first is not required, but doing a full clear of, at the very least, the first page of program ram is required, otherwise the sub-cpu bios hangs on initialization.
Here's your bug confirmation:

The model 1 bios decompresses the subcpu bios to a full 22KB, with 14 ...

I've tested the flux rom, and it can't boot a laseractive either. It starts, but none of the controls work, and it doesn't manage to read the track list.
Of course it doesn't. Flux has no idea where the subcpu bios is in the LaserActive boot rom.

Best as I can figure, the sub-cpu does boot and ...

As always, there's the one at Eidolon's: scd_100_us.zip. It's a memory snapshot that includes the sub bios (the first 22KB), the bios SP and its PCM module.

If you're looking for a particular version, it should be easy enough to extract.

I haven't tested it explicitly, but it should be 512-byte segments. The bios invariably sets the write-protect value to 0x2A in order to protect 0x0000 thru 0x53FF. Incidently, this range is good for the original sub bios, though later versions of it extend past 0x53FF (<= 0x57FF).

My attempts to boot the system from a cartridge have been unsuccessful so far. The main cpu does everything I want it to, but when I expect the subcpu to kick in and start executing code, I get nothing.
Kinda wish I had the hardware for testing right about now. You might want to verify the sub ...