Search found 60 matches

by Jazzmarazz
Fri Feb 19, 2016 6:35 am
Forum: Megadrive/Genesis
Topic: SMS direct to Genesis
Replies: 1
Views: 1348

Re: SMS direct to Genesis

I have gotten it to work, but only partially. It took so long because I had to enable SMS mode on my Nomad which was a nightmare. In any case, The program runs and sounds fine but the graphics are glitched. Some pixels repeat, and everything is very faded out. Is this a problem with RAM/VRAM? Do I h...
by Jazzmarazz
Thu Feb 18, 2016 1:14 am
Forum: Megadrive/Genesis
Topic: SMS direct to Genesis
Replies: 1
Views: 1348

SMS direct to Genesis

Hi there, Im trying to get a simple 32Kbyte SMS ROM to run directly on the Sega Genesis. From what I understand, I need to ground B30 (!S_RESET) and if I want support for the pause button, I will need to connect B9 to VCC, B10 to GND and Pull B11 high, with a button connected between it and GND. Thi...
by Jazzmarazz
Mon Dec 01, 2014 9:51 pm
Forum: Hardware
Topic: Possible DIY USB Genesis/MD Reader/writer
Replies: 11
Views: 5768

Small update. I can now read the content of carts directly to the PC! I am simply using bit manipulation within loops and pin arrays. I need to clean up the code first and write some intelligent functions (read header first, check for cart/backwards cart, etc) and then I can write a simple GUI and m...
by Jazzmarazz
Wed Nov 19, 2014 10:35 pm
Forum: Hardware
Topic: Current Consumption Measurements of Various Game Cartridges
Replies: 9
Views: 5421

Holy cow, can you take some shots of virtua fighter's insides? Why on earth is that so large?
by Jazzmarazz
Tue Nov 18, 2014 1:01 am
Forum: Hardware
Topic: Possible DIY USB Genesis/MD Reader/writer
Replies: 11
Views: 5768

Speed is not my concern, just functionality. I still have time for changes though, since this is just a prototype (obviously). :P
by Jazzmarazz
Mon Nov 17, 2014 4:15 am
Forum: Hardware
Topic: Possible DIY USB Genesis/MD Reader/writer
Replies: 11
Views: 5768

Thanks for all the great links guys. I went ahead and decided to remove the IC's and wire up my own board based on the MEGA. I am going to start on the code now.

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by Jazzmarazz
Thu Nov 13, 2014 4:14 pm
Forum: Hardware
Topic: Just a Simple Cartridge Port Probing Adapter
Replies: 10
Views: 4634

Indeed!
by Jazzmarazz
Thu Nov 13, 2014 4:02 pm
Forum: Hardware
Topic: Just a Simple Cartridge Port Probing Adapter
Replies: 10
Views: 4634

Hey db, looks nice. Reminds me of the probe board I made for gameboy....sadly these things don't want to sell.
http://store.kitsch-bent.com/product/kk_gb_brkout
by Jazzmarazz
Fri Oct 24, 2014 9:38 pm
Forum: Demos
Topic: YMDj - A Native Sega Genesis/Megadrive Music Tracker.
Replies: 46
Views: 12986

I have just literally registered here just for this. I absolutely love the idea of having a proper tracker that is made enterely for the hardware, within the hardware. However. I am not really happy about the UI myself, those colors and those fonts would make working on a CRT ( or most monitors, fo...
by Jazzmarazz
Tue Oct 21, 2014 9:09 pm
Forum: Demos
Topic: YMDj - A Native Sega Genesis/Megadrive Music Tracker.
Replies: 46
Views: 12986

I have just literally registered here just for this. I absolutely love the idea of having a proper tracker that is made enterely for the hardware, within the hardware. However. I am not really happy about the UI myself, those colors and those fonts would make working on a CRT ( or most monitors, fo...
by Jazzmarazz
Thu Oct 16, 2014 11:51 pm
Forum: Cartridge
Topic: Writing to 8-bit SRAM
Replies: 6
Views: 2763

Is that really all there is to it though? He said something about "making the !LDSW pin go low" and I know squat about that. !LDSW is the write strobe for the lower byte. Whenever there's a write that involves the low byte, this pin goes low (the ! indicates an active low signal). So it will go low...
by Jazzmarazz
Thu Oct 16, 2014 3:46 am
Forum: Cartridge
Topic: Writing to 8-bit SRAM
Replies: 6
Views: 2763

Writing to 8-bit SRAM

How do I write to my SRAM? As all of you know, the SRAM in official games is connected only to the Lower byte of the data bus, and writing is enabled by making the !LDSW pin go low.

My parallel SRAM is located between 0x200000 and 0x23FFFF. please help me write bytes to it.
by Jazzmarazz
Wed Oct 15, 2014 10:01 pm
Forum: Hardware
Topic: Possible DIY USB Genesis/MD Reader/writer
Replies: 11
Views: 5768

Here: // Cold reset void DoColdReset() // MRES/VRES --______-- { PORTB = 0xFF; PORTD = 0x00; delay(1000); PORTD = 0x03; } // Warm reset void DoWarmReset() // VRES --______-- { PORTB = 0xFF; PORTD = 0x02; delay(100); PORTD = 0x03; } // Read word word DoReadWord(long Adr) // ASEL - $000000..$7FFFFF /...
by Jazzmarazz
Wed Oct 15, 2014 12:56 pm
Forum: Hardware
Topic: Possible DIY USB Genesis/MD Reader/writer
Replies: 11
Views: 5768

Hey, that is wonderful! Where can I get some more info? Does your board allow for writing to any address as well?
by Jazzmarazz
Wed Oct 15, 2014 4:19 am
Forum: Hardware
Topic: Possible DIY USB Genesis/MD Reader/writer
Replies: 11
Views: 5768

Possible DIY USB Genesis/MD Reader/writer

I eventually want to make a fully capable reader/writer supporting many mappers, roms and rams, but for now I spent the night working on this. It is a Gen/MD cart reader and writer based on the Arduino MEGA using the EXTernal MEMory interface. I have used the exmem interface for normal external RAM ...