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Is it possible to play Gen ROMS on SCD?
Jeffrey - Nov 12, 2002
  Jeffrey Nov 12, 2002
Is there anyway to play genesis roms on the Sega CD?

Just kidding...

I found some strange mega drive carts in korea. Including some bootleg, homemade games (pong, omega race, etc.) and a multi cart of master system games.

Here is my question. Are the master system roms capable of being played on gen with no modification or are these games on the multi cart rewritten for the Genesis?

Because I have seen some SMS to GEN converters that were just like a cart extender. is the hardware that similar?

 MasterAkumaMatata Nov 12, 2002
Read what Arakon wrote about Phantasy Star I for the Genesis. (Quotes taken from the Developers Central forum.)


  
	
	

		
		

			Originally posted by M3d10n@May 30 2002, 8:04 pm



Isn't the PSC PS1 actually the Genesis version? This way they would have less problems in running it, by "emulating" only the genesis, and not the SMS.



  
	
	

		
		

			Originally posted by Arakon@May 30 2002, 8:48 pm



there is no genesis version, technically.



all the genesis cart is is a SMS rom in a cart wired up as a SMS adapter.



a dump of it would give you a 100% SMS rom, NOT a genesis rom that any genny emu could run.


 Link Hylia Nov 12, 2002
yes, Sega Genesis has the z80 from the SMS, and the powerbase converter disables the 68000 (8Mhz Motorolla chip) and puts the z80 as the quarterback.

this is going to be a strange request, but has anyone built there own PB converter, or wired a SMS cart with the conversion?

 Arakon Nov 24, 2002
I haven't, but it's technically no problem at all. all the SMS adapters contain no useful hardware AT ALL, it's just a pcb that wires the SMS cart pins to the genny cart pins and puts GND on one pin. that's all.

 ExCyber Nov 27, 2002

  
	
	

		
		

			 it's just a pcb that wires the SMS cart pins to the genny cart pins and puts GND on one pin. that's all.


IIRC, the adapters also have a pullup on 68K D15 (which is presumably mapped to Z80 NMI in M3/SMS mode), with a button to ground it; i.e. the pause button. I'm not sure it's 100% necessary to pull it high, but my vote goes squarely against leaving an NMI line floating, even if the glue logic probably takes care of it.

 Curtis Nov 28, 2002

  
	
	

		
		

			Originally posted by ExCyber@Nov. 28 2002, 5:50 pm



IIRC, the adapters also have a pullup on 68K D15 (which is presumably mapped to Z80 NMI in M3/SMS mode), with a button to ground it; i.e. the pause button. I'm not sure it's 100% necessary to pull it high, but my vote goes squarely against leaving an NMI line floating, even if the glue logic probably takes care of it.


That was English, right? ???

 Nemesis Nov 30, 2002

  
	
	

		
		

			Originally posted by ExCyber@Nov. 27 2002, 12:50 am








  
	
	

		
		

			 it's just a pcb that wires the SMS cart pins to the genny cart pins and puts GND on one pin. that's all.
		

		

	





IIRC, the adapters also have a pullup on 68K D15 (which is presumably mapped to Z80 NMI in M3/SMS mode), with a button to ground it; i.e. the pause button. I'm not sure it's 100% necessary to pull it high, but my vote goes squarely against leaving an NMI line floating, even if the glue logic probably takes care of it.


*Spends a minute translating*

I need to brush up on my technobabble.

 Link Hylia Nov 30, 2002

  
	
	

		
		

			Originally posted by Nemesis+Nov. 30 2002, 5:05 am-->
QUOTE(Nemesis @ Nov. 30 2002, 5:05 am)