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After discussing cycle pattern registers with VBT, I was wondering about the undocumented bits listed in the VDP2 manual, which are covered over when the page renders: $18000C - (Labeled as "RESERVED") Bit 8 (VRAMCE) 0= No change function, VRAM-A and VRAM-B are display RAM 1= Change...

I've attached an image of a Sega Saturn cartridge PCB. I ordered a set of these and will dump the ROMs when they arrive, but in the meantime would like to figure out what they are for. The carts have one DIP 512Kx8 flash memory chip. This seems like an unusual choice considering all Sega Saturn...

For anyone who owns HyperDuel on the Saturn, I had some questions about the music: - Is it remastered/remixed or the same as the arcade game? - Does it use CD audio (redbook) or not? - If no CD audio, does it have a sound test mode available? This game sure is expensive. :\

I noticed some of the smaller 32X games such as Space Harrier and Afterburner have a jumper on the PCB that allows the /BYTE input of the mask ROM to be tied low or high; normally high for all 16 bits of the data bus to be used. Any idea why such a feature would be present? Can the SH-2 in the...

I was probing around the Genesis and checked out some of the signals (all while /CART is grounded). Address ranges that make the system lock up (no DTACK) weren't included. Cartridge port: /ASEL is asserted for reads and writes within 000000-7FFFFF /CAS_2 is asserted for reads and writes...

How exactly was it confirmed that the SVP is a Samsung SSP1601 DSP? Was this from a patent, interviews with game designers, recently unearthed documentation, or what? If any of that holds true, do we have links to the relevant sources? I've been reading a lot of 'it's recently been confirmed'...

I'm interested in getting a scan of the instruction manual (and/or box art) for "Splatter House Part III" on the MegaDrive. I think the US and EU manuals are identical, if the game even came out in Europe. AFAIK the Japanese version has considerably more artwork and other goodies. :D

Has anyone figured out the details about how to use DRAM on the Genesis? I'm assuming it is capable of automatic refresh, which would simplify the glue logic used. My guess is that the DRAM control register at $A11000 is used to enable it, periodically halting the 68000 to insert a refresh...

I need some help with an experiment involving the 32X. If somebody has experience writing and running code on it and would be willing to try a simple test (this would be a 1 line modification to something you already wrote) I'd appreciate it - I don't have a flash cart so I can't develop or test...

I've got a PC with a AMD Duron @ 1.2 GHz. It has a stock heatsink and fan, which has been getting noisy recently. I can also hear it change pitch when I turn on a monitor plugged into the same socket (e.g. when there's a load on the power supply) I'm guessing either the fan is bad and will need...

A few years ago I worked on a format for storing ripped Sega Genesis music. It worked, and I ripped around 30 games to get an idea of the different types of music drivers used. I never quite finished the project as writing the user interface always held me up. But there's definitely a need to...

I'm trying to map a NVRAM chip within the $800000-$9FFFFF memory range, and don't want to use $000000-$7FFFFF or the other areas where /DTACK is managed by the hardware. So I'll need to assert it myself, but that's where things get confusing. I've been looking at other 68000 designs to see how...

The link at the CodeJunkies site for Shenmue II isn't working at the moment: http://uk.codejunkies.com/codes_show.asp?r...1&g=5245092&p=5 I guess the webmaster screwed something up. :( Does anyone have Action Replay / GameShark codes for the PAL version of Shenmue II? I'm looking for the...

I'm revisiting an old problem I had with interrupts, maybe somebody can explain what's going on. To my knowledge when an interrupt is generated, it has to be acknowledged - the SCU doesn't auto-acknowledge interrupts. Based on the first SCU manual, you have these: $25FE00A0 - Interrupt mask...

I have a Dreamcast that has problems with the display when using composite or S-Video. The brightness is totally off and I lose sync which causes shearing on the display. VGA output from the VGA box is perfect, however. I've used other A/V cables, cleaned the Dreamcast out using compressed...

I have an really old computer with a Comms Link card that I use for Saturn programming. However being quite slow, it takes for ever to compile programs using the KPIT stuff. Plus all the sound and art tools are on different computer so I end up copying lots of stuff over to the old machine as I...

This is less Sega related (still about game consoles) and more of a general electronics question, but we have some very smart people here, so I'll go ahead. :) I have a circuit where the data bus comes from a heavily loaded 74ALS245 which is probably near the limit of it's fanout capacity. It...

For SMS/GG program development, an extra header ("tag") was added to the ROM file for identification. It provides some simple features like the date and version of the program, who wrote it, the program name, and any additional notes. Emulators like MEKA and ROM tools such as SMS Checker support...