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PostPosted: Fri Dec 14, 2012 12:12 pm 
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Joined: Mon Jan 03, 2011 8:39 am
Posts: 26
qwertymodo wrote:
Woops, you're right. You could do it with 1 of these and just tie the 2 output buses together, then use a single transistor NOT gate as a 1-of-2 decoder to drive the /OE's. Considering the alternatives, MAX4551's are ~$4 each and you'd need 2. A cheap PIC is going to be a couple bucks, and then you have to program it. An FPGA is complete overkill. The 74CBT16210 is ~$1.


It would work with this part, but wiring would be a real mess. I only pay 1 buck for a 4551 here. If a PIC for $3 can do the job, I think that's a good solution.


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PostPosted: Fri Dec 14, 2012 1:52 pm 
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Joined: Mon Jul 02, 2012 7:46 am
Posts: 760
Routing wouldn't be too bad if you mirrored the two banks (connected 1B1<->2B10, 1B2<->2B9, 1B3<->2B8, etc.).


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PostPosted: Mon Feb 06, 2017 1:35 am 
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Joined: Sat Jun 03, 2006 9:17 pm
Posts: 303
Sorry to dig up old thread, but not finding much information. Was you able to get this to work? I want to make me some carts, but I need some lorom games, but I have a ton of hirom here. Just need a way to convert them over so that lorom games will work on the hirom boards?


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PostPosted: Mon Feb 06, 2017 7:12 am 
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Joined: Sun Sep 19, 2004 11:12 pm
Posts: 19346
Location: NE Indiana, USA (NTSC)
The easiest way, if you are willing to waste memory and the game lacks battery save, is to double each 32768 bytes of the ROM.


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PostPosted: Tue Feb 07, 2017 1:08 am 
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Joined: Sat Jun 03, 2006 9:17 pm
Posts: 303
Yeah I need a battery =( hehe


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PostPosted: Tue Feb 07, 2017 9:30 am 
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Joined: Sun Sep 19, 2004 11:12 pm
Posts: 19346
Location: NE Indiana, USA (NTSC)
The rewiring to move the battery save from (say) $708000 to $306000 is a bit more extensive than the minimum needed to get a saveless game working.


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