Search found 176 matches

by notaz
Thu Jun 25, 2015 3:43 pm
Forum: Blabla
Topic: "Still Alive" (Sega-to-Sega communication) demo
Replies: 3
Views: 2080

The I/O ports have 7 pins which can be programmed as input or output, so it's possible to program any protocol you like to exchange data between the machines or even PC parallel port. The achievable bitrate is in tens of KiB/s.
by notaz
Wed Jun 10, 2015 4:44 pm
Forum: Hardware
Topic: I/O Ports read upper byte
Replies: 1
Views: 1731

IIRC it's just mirrored, it's also documented in gen-hw.txt
by notaz
Wed Jun 10, 2015 4:42 pm
Forum: Megadrive/Genesis
Topic: MOVM.L syntax
Replies: 4
Views: 1451

Why not just use as --register-prefix-optional ?
by notaz
Wed Jun 03, 2015 12:12 pm
Forum: Hardware
Topic: Cartridge interrupts?
Replies: 4
Views: 2030

Well even expansion port can't do it, SegaCD has to get away without interrupts to MD's 68k. You are partially right about Z80, partially because it only works in master system mode (one of address lines is then repurposed for Z80 NMI). The only things I can think of is connecting a wire to one of I...
by notaz
Tue Apr 28, 2015 5:39 pm
Forum: Demos
Topic: Miniplanets
Replies: 5
Views: 1522

Maybe it's time to lift the ban - times change and people occasionally do too.
by notaz
Tue Apr 28, 2015 5:33 pm
Forum: Exodus
Topic: Exodus 2.0 + Open Source Release
Replies: 105
Views: 18761

I've noticed a donate button - be aware that PayPal doesn't like emulators and has frozen accounts of several emulator authors recently.
by notaz
Mon Jan 12, 2015 1:50 pm
Forum: Mega/SegaCD
Topic: MegaCD2 Japan Bios on PAL MegaCD2
Replies: 23
Views: 6063

l_oliveira wrote: I booted the USA 1.10 SEGA CD ROM this way on a TMSS VA6 MD1.

The unmodified SEGA CD BIOS satisfied the TMSS check and stuff worked correctly.
Nice, wasn't expecting it to handle that as it doesn't have to.
by notaz
Mon Jan 05, 2015 1:54 pm
Forum: Mega/SegaCD
Topic: MegaCD2 Japan Bios on PAL MegaCD2
Replies: 23
Views: 6063

How does the Everdrive work for this case exactly? Maybe by watching address bus and toggling CART_IN during BIOS access? Isn't it the case when a cart is inserted the CD BIOS (the original one in the Mega-CD) gets mapped to 0x40000000 and cart is mapped to 0x00000000 and this swaps around when car...
by notaz
Tue Dec 02, 2014 1:33 am
Forum: Demos
Topic: Sonic romhacks playing themselves to completion
Replies: 0
Views: 1809

Sonic romhacks playing themselves to completion

These are currently fastest Sonic TASes (tool-assisted speedruns) hacked into the ROMs themselves and resynced to play on real hardware. Usually to play a TAS on real hardware, some sort of device is needed to be connected to controller port(s) to feed the inputs, with this any console with a flashc...
by notaz
Mon Nov 24, 2014 4:20 pm
Forum: UMDK
Topic: UMDK Manufacture: who wants one?
Replies: 170
Views: 28338

If you get another free spot you can post here, I (or someone else) may consider taking it.
by notaz
Mon Nov 24, 2014 4:04 pm
Forum: Hardware
Topic: Current Consumption Measurements of Various Game Cartridges
Replies: 9
Views: 3961

EU version also has the shied. Notice some differences on chip markings:
http://notaz.gp2x.de/img/hw/virtua_racing_front2.jpg
by notaz
Wed Oct 29, 2014 5:41 pm
Forum: UMDK
Topic: UMDK Manufacture: who wants one?
Replies: 170
Views: 28338

I'm now considering taking one as well as it would help with my current project, but not 100% sure as it kind of depends on when it's ready.
by notaz
Sun Oct 26, 2014 7:41 pm
Forum: Cartridge
Topic: About !DTACK timings
Replies: 12
Views: 3960

So, has anyone investigated the memory mode register? I don't have a logic analyzer, but from looking at spinning loops it seems it has no effect on 68k's bus access timings.
by notaz
Wed Jun 25, 2014 11:32 am
Forum: UMDK
Topic: USB MegaDrive DevKit
Replies: 28
Views: 6402

Chilly Willy wrote:Oh, I see. Gaps in the CD address range may also be the best way to handle it.
AFAIK there are no gaps in CD address range, it's mirrored all over the place as upper address lines are simply not connected to expansion port..
by notaz
Mon Apr 07, 2014 12:17 pm
Forum: Cartridge
Topic: How does the cartridge slot get mapped to 0x400000?
Replies: 3
Views: 1919

It's controlled by /CART (B32) pin on the cart connector only, if it's connected to ground, cart's /CE (chip enable) signal will respond to 000000-3fffff, else to 400000-7fffff.