SpritesMind.Net

Ok, I can confirm that the Japan 1.05 LaserActive bios that's floating around out there is a BAD DUMP. There's corruption in the main CPU compressed payload that's scrambling opcodes partway through the data stream. Here's an archive of the original thread where this dump originates from:
https ...

I tested Japan BIOS 1.05 and it hangs when starting, 1.02 seems to work. I'm only getting 30-40 fps. Tried both my internal HDD and external SSD, it didn't seem to affect much besides the initial loading time. I'm running an i7 7700 @ 3Ghz and an Nvidia GPU so my computer should ostensibly be fast ...

Yep, saw that. Some of those rips might be redone soon, to capture the lead-in and lead-out. I've been chatting with the people behind those releases. I've got a ripping guide with the approach I used online here:
https://techdocs.exodusemulator.com/Console/PioneerLaserActive/Archiving.html
Most of ...

Six year bump, to state that the ripping project is nearing completion. Titles aren't generally available yet, but they'll be uploaded to archive.org sometime over the next few months. Details on my site here:
https://techdocs.exodusemulator.com/Console/PioneerLaserActive/Titles.html
And details on ...

11 year bump, to say I finally went and did this. I've made a fork of Ares with initial support for MegaLD games, and released a playable rip of Space Berserker. Details up on my site here:
https://techdocs.exodusemulator.com/Console/PioneerLaserActive/Software.html#emulation
More work to follow ...

Nothing else from memory, just be aware the third party libraries haven't been updated, so they point at ancient versions that aren't all available on their original links anymore. If you use the wayback engine at archive.org you can pull down any missing ones. I'll be updating them soon.

Hey Matt, just letting you know I've pushed a change to Exodus which adds timing information for trace logs, both in terms of processor clock cycles and absolute system time since the last "hard reset":
https://nemesis.exodusemulator.com/Exodus/Images/TraceLogTiming.png
This is logged to file as ...

I see what you're saying. I think adding timing information to the trace logs would be the right way to go. Using GetCurrentTimesliceProgress() is good, but you'd probably be more interested in a time in clock cycles. Logging both would be best most likely. All this could be done within the ...

Really impressive work, good job guys! A transistor-level simulation of these devices is a great step for preservation.

Posting here to keep the updates flowing. Things have moved slower since my leave ended and I've started back at work, but it's still moving along. I've been able to fully decode the microcode in the production version of the 68000, and generate a listing for it in the same form as Appendix H in the ...

Huge thanks for this test ROM! I've started work on Exodus again, and I'm currently working on a microcode-level 68000 core that should get this to 100%. I was about to write a test ROM like this myself when I came across yours. These kind of tests are invaluable, thanks for putting it together!

A quick note to say I've updated my 68000 annotated schematic here:
https://github.com/RogerSanders/M68000Schematic
I've corrected a lot of register names, and identified more latches and regions in the die. You can view the annotated schematic using the Schematic Explorer tool I put together an ...

Math operations, flags, and the ALU
You should know there's another patent which covers the 68000 ALU specifically, and in some cases goes into more detail than US4325121. That patent is US4312034 here: https://nemesis.exodusemulator.com/M68000/Patents/US4312034.pdf

Before we talk about the ALU ...

The Execution Unit
So far we've covered how to determine the sequence of microinstructions that are executed for a given macroinstruction (opcode). Now we'll dive into what those individual microinstructions can do. The most critical component for this is the Execution Unit. There's an entire ...

Prefetch and initial state
Before you can properly understand the steps an instruction takes during execution, it's important to understand the state the processor is in before the instruction starts executing. Before each "normal" instruction (non-exception) begins executing, the following state ...