Questions tagged [sega-genesis]

For questions on Sega's Genesis (Mega Drive) home video game console

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Using the (An)+ to Memory addressing mode when address register is pointed to ROM causes Sega Genesis DMA to fail

This is a weird one, and I haven't found it documented anywhere. I was testing Sega Genesis DMA during scanline interrupts and found something very odd. When writing to VDP_CTRL to initiate DMA, if ...
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  • 1,538
10 votes
1 answer
841 views

How does Master System backwards compatibility work on the Megadrive?

I know that the Megadrive contains the Z80 CPU to help control the soundchips for 16-bit games, and that it provides backwards compatibility for the CPU processing of Master System software, but ...
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0 votes
4 answers
312 views

How did graphics processing for old 8/16bit consoles work & what are the differences between an FPU/maths co processor & a graphics card? [closed]

When looking on the internet at information about old consoles it's pretty easy to find out information on CPUs like the 6502, 65816, 68000 & Z80 used in retro computers & consoles like the ...
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5 votes
1 answer
642 views

Sega Genesis and Sega CD interaction

Sega must have thought about upgradability prior to the Genesis’s release, as there is a expansion slot to the right of the unit when looked at from the front. Is this the only expansion slot? Is it ...
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  • 1,585
2 votes
0 answers
181 views

Did the Mega Drive and/or Arcade version of the song "Afterburner" use FM synthesis or samples?

Does anyone know if the Mega Drive or Arcade version of Afterburner use FM synthesis or sound samples for orchestra hit in its song "Afterburner". I find oscilloscope views of each version but I'm not ...
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  • 485
3 votes
1 answer
269 views

"Genesis Lock-On Technology" to change the language of a Famicom game

I want to create a cartridge similar to Sonic & Knuckles or a Game Genie so that the text files loaded from the ROM or DEPROM of an original Famicom cartridge can be replaced with alternate ...
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1 vote
1 answer
322 views

Can I connect a Sega Megadrive or Genesis to an Amstrad Cpc monitor?

I'd like to buy an old Sega Megadrive, aka Genesis outside the UK. However I don't have a TV or computer monitor to view the graphics on. I do however have an Amstrad Ctm644, which is a 15Khz CRT ...
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18 votes
2 answers
4k views

How did the Sega CD decompress video?

In the early nineties, Sega released the Sega CD, a.k.a. Mega CD, an add-on that attached a CD-ROM drive to the Mega Drive a.k.a. Genesis. Its primary or at least most conspicuous use was for full-...
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2 votes
1 answer
349 views

In vasm 1.7d targeting 68000, how to assemble with program counter at specific address without padding?

I'm programming for the Sega Mega Drive using vasm 1.7d assembler. I'm copying a block of my code from ROM to RAM so I can do some self-modifying code. ; First $200 bytes are header, dc.b ...
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  • 159
9 votes
5 answers
1k views

Self-modifying code in commercial games for the (S)NES, Gameboy, Genesis/MD, PC Engine, Atari, etc

I'm curious if there are any extant examples of commercial games for classic consoles (let's say, pre-32-bit era here) which make uses of self-modifying code. As far as I know, all the systems I've ...
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  • 598
2 votes
2 answers
261 views

100-pin connector to FPGA/SOC, can I auto-detect if attached to NES, SNES, Genesis, N64, GB, GBA?

If I have a 100-pin connector that may be connected to any of several known devices (NES, SNES, Gameboy, and so forth), can the device somehow auto-detect which device it's connected to? For some of ...
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13 votes
5 answers
5k views

Amiga 500 OCS/ECS vs Mega Drive VDP

Superficially the Amiga 500 and Mega Drive are similar. Both run a Motorola 68000 CPU at similar clocks and both have dedicated hardware for sprite and other graphics operations. Comparing the arcade ...
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-3 votes
1 answer
220 views

Building a Sega Genesis Classic Portable - What kind of display? [closed]

I am trying to make a portable version of a Sega Genesis Classic. (See this example on Youtube.) I'm wondering what kind of display module I would need to solder to the board for this project.
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  • 7
20 votes
3 answers
9k views

Why was the Sega Genesis marketed as a 16-bit console?

The Sega Genesis / Mega Drive's main CPU, the Motorola 68000, was a 32-bit processor. Couldn't Sega have marketed the console as a 32-bit device? Or is there a technical distinction about how the ...
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33 votes
2 answers
7k views

How did people program for Consoles with multiple CPUs?

I'm specifically interested in the Sega Mega Drive/Genesis, which used a 68000 CPU, but also a Z80, mainly used to control the sound hardware and provide backward compatibility with the Master System. ...
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  • 525
5 votes
2 answers
3k views

If the Sega Genesis/MegaDrive could be overclocked so easily, why couldn't the SNES?

I discovered quite a number of videos on youtube demonstrating the effectiveness of over-clocking the CPU of Sega Genesis/MasterDrive. The video features games that are known for their intensive ...
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  • 919
1 vote
1 answer
863 views

Landstalker 2 or a "Look Like"?

Can anyone help me? Is there an Landstalker 2 or a "Look Like" on Sega Mega Drive? Perhaps an "Fan-Made" - Thing? I searched at Google - no results. But I think, in the early 90s, there was an ...
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13 votes
4 answers
3k views

What is going on in the overscan area of Sega Genesis games?

I noticed that different games display different things in the overscan area. I understand this was never intended to be seen. However, I would still like a technical explanation. Was this useful to ...
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5 votes
2 answers
1k views

Graphics Editor for 16-Bit Games

Which programs or tools were used to create the sprites and backgrounds for 16-Bit games like those on the Super Nintendo or the Sega Genesis?
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11 votes
1 answer
2k views

What ended the Sony console partnerships with Sega and Nintendo?

Sega and Nintendo were the dominant players in the console market at the end of the 1980s and into the 90s. By early in the next decade, Sony shipped the PlayStation 2, leading Sega to exit the ...
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11 votes
1 answer
2k views

What cleaning/repair can be done to a Mega Drive cartridge slot?

My Mega Drive's cartridges rarely boot. It's to the point where I sometimes don't want to change the current game because it'll mean 15 minutes of me constantly taking out and re-seating the next ...
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  • 820
8 votes
1 answer
2k views

Why is my Sega Genesis/Mega Drive II getting frozen?

My Sega Genesis/Mega Drive II get stuck (the image on the screen seems frozen) after some incidents that occurred to it. It doesn't matter when that is happened, which game did I play or even how hot ...
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16 votes
3 answers
4k views

Sega Genesis/Mega Drive ROM Disassembler

I am looking for a disassembler that supports Sega Genesis ROMs. Ideally, any 68000 disassembler should be able to do this (IDA Pro supposedly does an amazing job but their demo version does not ...
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  • 9,242
65 votes
1 answer
33k views

How exactly does Sonic & Knuckles' 'Lock-On Technology' work?

The cartridge of Sonic & Knuckles is a little special: It flips open to allow you to connect another Sega Mega Drive (Genesis in US) cartridge to the top of it like so: I know why the Sega ...
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