Search found 2441 matches
- Sat Dec 09, 2006 11:18 am
- Forum: Cartridge
- Topic: Problem with accessing SRAM
- Replies: 10
- Views: 20842
No byte access, I used long word. I want my game to work in emulators too not only on real hardware (and that method works on real HW). I'll try NOPping. As far as I know, there is no rom/ram banking mechanisms in MD, if you want such thing you need to develope it on a cartridge. I believe that reg ...
- Fri Dec 08, 2006 1:41 pm
- Forum: Cartridge
- Topic: Problem with accessing SRAM
- Replies: 10
- Views: 20842
- Thu Dec 07, 2006 4:04 pm
- Forum: Cartridge
- Topic: Problem with accessing SRAM
- Replies: 10
- Views: 20842
The STATIC RAM on the cartridge. The cartridge works like this : any access below 10000h enables ROM and access above enables RAM, If you write something, the 68K pulls !LDSW (or !UDSW) low and that signal is used as WriteEnable on RAM. I did such thing with my pirate Sonic3 cartridge which doesn't ...
- Thu Dec 07, 2006 3:58 pm
- Forum: Announcement
- Topic: Z80 tools
- Replies: 2
- Views: 8077
- Thu Dec 07, 2006 9:16 am
- Forum: Cartridge
- Topic: Problem with accessing SRAM
- Replies: 10
- Views: 20842
Problem with accessing SRAM
I'm writing a game for MD (Glass Braker MD) which is uses SRAM, but I have trouble accessing it. MOVE.L #$00010001, A0 ; load SRAM start addess MOVE.B #230, (A0) ; write byte MOVE.B (A0), D0 ; read byte Trouble is that the read byte is not 230 but 0. SRAM gets saved with 230 in *.SRM file. What need...
- Thu Dec 07, 2006 8:52 am
- Forum: Megadrive/Genesis
- Topic: Genny and 3D
- Replies: 138
- Views: 99570
- Thu Dec 07, 2006 8:44 am
- Forum: Announcement
- Topic: New home-made MD cartridge R/W device is born
- Replies: 5
- Views: 12313
The VPP (12V programming voltage) pin is not on the cart slot, but it could be if you like (use some unused pin). I used a wire for that. I'm working on EPROM stuff as all EPROMs are not programmed the same way. There are lots of Flashes out there, if its industry standard and 5V it can be used with...
- Wed Dec 06, 2006 1:48 pm
- Forum: Video Display Processor
- Topic: Is DMA useful ?
- Replies: 30
- Views: 29461
- Wed Dec 06, 2006 1:41 pm
- Forum: Announcement
- Topic: Honorable members
- Replies: 14
- Views: 28688
- Wed Dec 06, 2006 6:31 am
- Forum: Announcement
- Topic: New home-made MD cartridge R/W device is born
- Replies: 5
- Views: 12313
Its rough indeed...
It is rough, but it works !!! I dumped most my cartridges, messed with backup RAM on Sonic3 cart and
even BURNED an EPROM !!! Man, EPROMs program easy. I started to write the documentation and some instructions.
even BURNED an EPROM !!! Man, EPROMs program easy. I started to write the documentation and some instructions.
- Tue Dec 05, 2006 1:44 pm
- Forum: Announcement
- Topic: New home-made MD cartridge R/W device is born
- Replies: 5
- Views: 12313
New home-made MD cartridge R/W device is born
On 2nd december is started to build a MD cartridge R/W device whis is 100% designed by me. Today (5th) I got it working correctly, I dumped my Sonic & Knuckles cartridge. It took 45 seconds and the result was a perfect bit accurate copy of the ROM image. If I ASM optimize my QB45 code (I love QB45) ...