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You can use !AS to latch the current address for decode purposes etc. I'm not sure if DMA uses it or not though.

It can only be used in ranges where VDP doesn't generate it for you such as 800000...9FFFFF. This area is used by 32X and SVP for example. You cannot forcibly override !DTACK since VDP actively drives it on most accesses.

You can only drive !DTACK in 800000...9FFFFF range and other ranges (holes in IO ranges) where it isn't generated by VDP for you. In ranges where it is you will cause contention and that's gonna destroy something sooner or later.

VDP is what generates the !DTACK *for* 68K. During DMA the 68K is in bus requested state so that signal has no meaning of any sort.

One edge puts address on the bus, other edge collects the data. One clock cycle.

These names make me think of stuff seen in Visual6502

Fusion definitely ignores RV bit and always keeps ROM areas same as in MD mode with the exception of vector stuff. For 32X dev you aboslutely need real hardware to do all testing on. When I did more 32X stuff I learned very early on that emulation is way too forgiving and it is super easy to get som...

Top address byte of DMA transfer is a page register so to say, only the lower two bytes actually increment with each transfer, thus the 128KB pages where transfers take place.

68K can certainly draw into the framebuffers but it is probably tens of times slower that SH2 and you can probably forget about things like scrolling etc. since they'll use up a lot of 68K time, every single pixel needs to be manually written to the framebuffers by CPU, there's no hardware blitter. ...

There is no initialization, the attack begins wherever last state left off. Only way to get maximum attenuation is to wait out the envelope, using fastest release to reduce the time needed. Only on chip reset the internal attenuation is at max attenuation, once first note begins all bets are off.

Motorola couldn't up the clocks and their chips started to lag behind others (intel, IBM etc.) who were getting faster and faster, their big flagship chips weren't competitive anymore and customers moved to new things. In the end they dropped 68k line and started doing PowerPC instead...

68040 and 68060 are the pipelined 68k series CPUs.

Most of the info is found in this post and this thread in general : viewtopic.php?p=5716#p5716

Attack is done with reverse logarithmic slope while other things are done with normal logarithmic slopes. The way envelopes progress is tied to couple LUTs, after every certain amount of samples according to one LUT and ADSR settings, a value from another LUT is added to the attenuation value. Attac...