Search found 699 matches

by HardWareMan
Wed Sep 13, 2017 8:01 am
Forum: Megadrive/Genesis
Topic: M68k opcode sizes test ROM
Replies: 19
Views: 1011

Re: M68k opcode sizes test ROM

Mask of Destiny wow, nice debugging! Now I know, why my cartridge also reboots. I'm just forgot about RESET opcode... So, it must be launched only with dumb ROM cartridge.
by HardWareMan
Tue Sep 12, 2017 4:28 pm
Forum: Megadrive/Genesis
Topic: M68k opcode sizes test ROM
Replies: 19
Views: 1011

Re: M68k opcode sizes test ROM

Can you post compiled versions of updated tests?
by HardWareMan
Tue Aug 29, 2017 3:04 am
Forum: Hardware
Topic: SEGA IR wireles joypad
Replies: 7
Views: 502

Re: SEGA IR wireles joypad

The IR problem is in unidirectional. So, all emitting devices doesn't to know about each other. If they can be bidirectional, they can be in passive mode and answer only when base unit ask any single device wich will have unique address (callsign). All arbitrage done by base unit and no colisions wi...
by HardWareMan
Mon Aug 28, 2017 12:30 pm
Forum: Hardware
Topic: SEGA IR wireles joypad
Replies: 7
Views: 502

Re: SEGA IR wireles joypad

Sure. The joypad sends its own state every X time. Always when any button is pressed. The base reads the joypad state and convert it to state of internal joypad, that physically connected to the console. If no state was recieved by IR after X time (plus some time) the internal joypad state force to ...
by HardWareMan
Thu Aug 17, 2017 8:40 pm
Forum: SGDK
Topic: ROM padding question
Replies: 22
Views: 862

Re: ROM padding question

Sik wrote:
Thu Aug 17, 2017 8:30 pm
matteus wrote:
Thu Aug 17, 2017 1:39 pm
From Address 003ee4e0 to 00effff0 its nothing but "00"
The end of the ROM should be 003FFFFF =P
The ROM windows should be $000000-$3FFFFF, but ROM itself not required to be up to $3FFFFF.
by HardWareMan
Sat Aug 12, 2017 1:30 pm
Forum: Cartridge
Topic: How does work SRAM on everdrive?
Replies: 20
Views: 803

Re: How does work SRAM on everdrive?

Ah, so...
Image
Image
Should work! One more reason to use low byte D7-D0.
by HardWareMan
Sat Aug 12, 2017 11:34 am
Forum: Cartridge
Topic: How does work SRAM on everdrive?
Replies: 20
Views: 803

Re: How does work SRAM on everdrive?

Then I suppose if neither CAS0, WRL or WRH is asserted an invalid address exception is launched, right? You should use these signals only with CE0 and get desired access within $000000-$3FFFFF (first 4 Mbytes) dedicated to ROM cartridge. That's why 32MBit games use bank switching for SRAM (f.e. Sto...
by HardWareMan
Sat Aug 12, 2017 9:56 am
Forum: Cartridge
Topic: How does work SRAM on everdrive?
Replies: 20
Views: 803

Re: How does work SRAM on everdrive?

It is more than meets the eye. If you use D7-D0, so that you can access to it bytewise at odd addresses, because of big endianness of M68K. But MD cartridge slot have only one CAS0 for read and two WRL and WRH for write. So, cartrige can be read only by word while can be written by any byte separatl...
by HardWareMan
Sat Jul 29, 2017 8:23 am
Forum: Hardware
Topic: SEGA IR wireles joypad
Replies: 7
Views: 502

SEGA IR wireles joypad

I recently bought SEGA IR joypads. The base: MODEL No. MK-1648 Chipset: SEGA 315-5714 (codes 9338EP713 069 ) http://savepic.net/9631729m.jpg http://savepic.net/9622513m.jpg http://savepic.net/9621489m.jpg http://savepic.net/9620465m.jpg http://savepic.net/9627633m.jpg http://savepic.net/9632753m.jpg...
by HardWareMan
Sat Jul 29, 2017 4:37 am
Forum: Cartridge
Topic: How does work SRAM on everdrive?
Replies: 20
Views: 803

Re: How does work SRAM on everdrive?

$1B0 - 'R' $1B1 - 'A' $1B2 : ___ D7 always 1, ___ D6 - 1 = RAM don't destroy after power off, ___ D5 - always 1, ___ D4:D3 - 00 = word sized RAM (D0-D15), 01 = not used, 10 = even byte RAM (D8-D15), 11 = odd byte RAM (D0-D7), ___ D2:D0 - always 000. $1B3 - ' ' (0x20) $1B4 - dword, start address of ...
by HardWareMan
Fri Jul 21, 2017 6:05 pm
Forum: Hardware
Topic: HDD (or flash) instead of a CD, questions...
Replies: 140
Views: 26737

Re: HDD (or flash) instead of a CD, questions...

Oh, so... OK, I can try this at home. :)
by HardWareMan
Fri Jul 21, 2017 3:46 am
Forum: Hardware
Topic: HDD (or flash) instead of a CD, questions...
Replies: 140
Views: 26737

Re: HDD (or flash) instead of a CD, questions...

KanedaFr wrote:
Fri Jul 21, 2017 2:00 am
I was waiting for your proto ;)
Like this?
KanedaFr wrote:
Sun Jul 02, 2017 10:16 pm
nothing, only wanted to know if the I2S was as great as it seems (with sound save) ;)
I could not get him to decode I2S as a sound. Only as data.
by HardWareMan
Thu Jul 20, 2017 3:37 pm
Forum: Hardware
Topic: HDD (or flash) instead of a CD, questions...
Replies: 140
Views: 26737

Re: HDD (or flash) instead of a CD, questions...

It's quiet down here. Too quiet.
by HardWareMan
Sun Jul 16, 2017 12:26 pm
Forum: Megadrive/Genesis
Topic: Super Magic Drive research thread
Replies: 133
Views: 39756

Re: Super Magic Drive research thread

This is normal practice. This table can be used by downloadable software. And these vectors will always be true, even if the system software is updated.