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More like "move.w #$2000, sr". :D If you read SCIPD are there any interrupts pending, even though they never get taken? Can you force a CPU software interrupt, or do those not work either? It's been a while but you may need to toggle the reset bit for the timer you are using in SCIRE to...

This is a pretty interesting observation. The game checks the cartridge area for the ID strings of several cheat devices and I assume the ISO patch disables that check. But if it can still detect a cartridge *only* when comms or codes are enabled, it must be checking something unrelated to the...

Yeah, that datasheet clears everything up. They do seem to be totally compatible. :D

I can't find a datasheet for the 28C1001, but I do know the 29EE010 had a very unique programming method that no other modern devices use IIRC. Chances are they are not compatible. I am surprised the two devices had the same manufacturer ID and device ID. The new EMS carts seem interesting...

Hooray! :D Just to be clear every entry must be a port of an existing game? Nothing else is allowed?

From what I saw the multibios with two switches has four possible switch settings (off-off, off-on, on-off, on-on) and with a three position switch you would get at most three settings. The least complex configuration I can think of is: Switch left terminal = BIOS pin 38, and a 4.7K ohm...

:D This will be awesome. If only somebody would release it outside of Japan too.

It's fantastic. The whole system of the game getting easier as you die and harder as you do better keeps it challenging but not frustrating, plus you have more incentive to replay to get through all the routes (like Darius Gaiden). Throw in good graphics, music, responsive controls, and you've...

According to the manual, the SSCTL settings are: 0 = PCM data read from DRAM 1 = White noise 2 = All zeros (silent) 3 = Undocumented In this case wouldn't a setting of 1 just be noise? I thought to do FM sound, you loaded a basic waveform in RAM (like a sine wave) and used that as the...

You can write it directly to flash memory. A long time ago some ROMs were distributed with AFAIK a 256 or 512-byte header. I really doubt they are still in circulation these days. All headerless ROMs will be a multiple of 16K if you need to check.

I had a Sega CD power supply that died (catastrophically, smoke everywhere) which had a audible hum or whine to it too. I guess that's a sign something isn't right. ;) It seems like a perfectly reasonable explanation. If you do get around to replacing the caps it would be great to hear if that...

If you have an oscilloscope, try examining the various voltages and see what kind of ripple you get. It sounds like the +9V rail may have quite a bit of it from your first post unless that's just when the CD drive's spindle motor is active. You may want to replace all the capacitors on the...

Have the MegaDrive versions of Splatterhouse 2 or 3 ever been dumped? GoodGen only has the US versions. Splatterhouse 2 has strings for the Japanese version which are never used, and it's hard-coded to use the US strings. So I strongly doubt it's a multi region game. From memory I think...

Do you recall any of the patent numbers or search phrases used to find these patents? Sounds intriguing!

I wrote up nice description of how the transparent sprites are managed and realized at the very end there's one VDP2 register I don't understand which throws part of the explanation into doubt. Oh well... :( The VDP1 can't do variable levels of translucency, but the VDP2 can. As the VDP2 reads...

The Master System and Genesis have identical A/V ports, so it should work with either. Maybe it's broken? Any chance you would want to take some pictures of what's inside the plastic box? :)

Oh, OK. Yeah, though I suppose it's a moot point without an ISO. :\

I'm a little frustrated with my Saturn right now, here's a preliminary version of the program with no horizontal scrolling (sorry). For some reason there is random graphics corruption for some of the 352x??? displays, but it happens infrequently in PAL or NTSC mode. Can't figure it out at the...

If you don't mind waiting a bit I'll see if I can get one written for you. The C4 demo I wrote only has the normal display mode enabled, after I got some reports of people not being able to view it I took it out IIRC. There are actually several varities of the progressive mode; you can have 480...

The videos are real (they are from SMS Power! afaik). Game Gear games will play on the SMS, except for the Start button doesn't work, stereo sound doesn't work, the palette is wrong, and accessing some Game Gear features will trigger SMS-specific ones that result in a crash or lockup. So it's...