Search found 30 matches

by MetalliC
Mon Jun 17, 2019 1:19 pm
Forum: Mega/SegaCD
Topic: Bike shedding a new CD-ROM format
Replies: 20
Views: 2316

Re: Bike shedding a new CD-ROM format

F1ReB4LL wrote:
Mon Jun 17, 2019 11:44 am
"I only remember GDs having some love over the last few years" was about your work :)
I was talking about "Bike shedding" new CHD revision, which will include lead-in/lead-out areas with subcodes or at least RAW TOC. as was said, there was at least smf and me who has been working on it.
by MetalliC
Sat Jun 15, 2019 5:19 pm
Forum: Mega/SegaCD
Topic: Bike shedding a new CD-ROM format
Replies: 20
Views: 2316

Re: Bike shedding a new CD-ROM format

It's not. The idea is good, the format itself is terrible. It needs a BCD image inside to be the proper MAME-grade format; right now it doesn't even have a proper TOC inside, let alone lead-in/lead-out/first pregap and even a multisession support. Nobody in MAME cares about optical formats (I only ...
by MetalliC
Sun Jun 02, 2019 12:56 pm
Forum: Mega/SegaCD
Topic: Bike shedding a new CD-ROM format
Replies: 20
Views: 2316

Re: Bike shedding a new CD-ROM format

This would be great, but what exactly would you use to rip in these formats? There's different drives that can rip all of these components. I don't know if there's a single drive that can do all of them at once. which components ? afaik most of drives can return only data area sectors (but not lead...
by MetalliC
Sun Feb 10, 2019 6:44 pm
Forum: Blabla
Topic: 68000 Arcade systems programming
Replies: 14
Views: 2245

Re: 68000 Arcade systems programming

I doubt you'll be able to find such notes. I'd recommend to learn MAME emulator structure. for example CPS1: src/mame/drivers/cps1.cpp - this is base CPS1 driver, you may find where: void cps_state::main_map(address_map &map) - main CPU memory map void cps_state::sub_map(address_map &map) - sound CP...
by MetalliC
Wed May 23, 2018 6:31 pm
Forum: Megadrive/Genesis
Topic: Color analysis between different emulators/editors
Replies: 5
Views: 2235

Re: Color analysis between different emulators/editors

there is also this 315-5313 die photo https://easyzoom.com/imageaccess/ffa60d ... f3881da6ff
really interested person may try to RE video DAC part
by MetalliC
Sat Sep 09, 2017 10:38 pm
Forum: Mega/SegaCD
Topic: X-Eye Service Manual and Technical Manual
Replies: 3
Views: 2291

Re: X-Eye Service Manual and Technical Manual

out of curiosity - does anyone has been trying to dump CDC firmware ? HD404019 MCU have "PROM mode" for programming and verification.
by MetalliC
Sat Jul 22, 2017 1:24 pm
Forum: Megadrive/Genesis
Topic: Cartridge copy protection
Replies: 9
Views: 2134

Re: Cartridge copy protection

one of good more-less recent examples: NG.DEV's games for Neo-Geo platform - no bootlegs or cracked copies exists, as well as no emulation. mainly because carts have NXP's ARM-based MCU, with internal 512KB flash rom, afaik big part of game logic code there, and no known ways to dump it. other good ...
by MetalliC
Mon Apr 24, 2017 10:14 am
Forum: Video Display Processor
Topic: Titan's Mega Drive tech docs including Debug Register
Replies: 36
Views: 10061

Re: Titan's Mega Drive tech docs including Debug Register

if I get it right - forcibly enabled plane ANDed with normally final result color number. there is always color number, in your case it is border color ?
by MetalliC
Tue Jan 31, 2017 1:37 am
Forum: Megadrive/Genesis
Topic: Genesis/MD test ROMs
Replies: 10
Views: 3862

Re: Genesis/MD test ROMs

my fellow Arzeno recently found and dumped interesting looking MD cart - http://i90.fastpic.ru/thumb/2017/0131/4a/467f275729fcec036fab841cc673744a.jpeg MD Soft Checker Version 0.30 **Prg. by papi** (C)SEGA 1993.MAR link looks like a PITA for emulators - on most of it stuck at failed "Z80 RUN" test, ...
by MetalliC
Mon Jun 13, 2016 11:00 am
Forum: Megadrive/Genesis
Topic: Dump of the D-CAT16 handheld (Firecore)
Replies: 13
Views: 4482

Re: Dump of the D-CAT16 handheld (Firecore)

I wonder why they added some much RAM but well, it costs almost nothing now so why not... if its similar to Sega Gopher handheld - game ROMs loaded into it's SDRAM (IC in right bottom PCB corner I'd guess) , which is quite big and likely used/mapped as both 'cartridge ROM' and main M68K RAM (and po...
by MetalliC
Wed Jan 20, 2016 3:37 am
Forum: Controls
Topic: Joypads 3/6 Button Response Timings
Replies: 7
Views: 2951

Re: Joypads 3/6 Button Response Timings

perhaps this bit of Eke's tech info will be useful
https://github.com/ekeeke/Genesis-Plus- ... -172347221
by MetalliC
Sun Jan 17, 2016 10:31 am
Forum: Demos
Topic: Mega Marble World
Replies: 50
Views: 16249

Re: Mega Marble World

alko wrote:
HardWareMan wrote:И здесь принято по английски писать. Допускается даже гуглетранслейт.
Автор данной игры russian.
quite many people here is non native English.
imagine what the heck will going on if each of them decides to use his native language
by MetalliC
Wed Dec 16, 2015 10:51 am
Forum: Sound
Topic: New Documentation: An authoritative reference on the YM2612
Replies: 859
Views: 372208

Re: New Documentation: An authoritative reference on the YM2612

its going off topic but... you are wrong, here is a lot of old games was released recent times, mostly from DotEmu company. all of them emulated, for example Raiden Legacy in Steam and GoG is MAME-based. so I'm not surprised some people like Jarek doesn't want to see their's code and research resear...
by MetalliC
Mon Dec 14, 2015 1:52 pm
Forum: Sound
Topic: New Documentation: An authoritative reference on the YM2612
Replies: 859
Views: 372208

Re: New Documentation: An authoritative reference on the YM2612

either it's something based on the MAME core which has an explicit "no commercial use" clause currently MAME in process of relicensing, so in most parts it is BSD-3 or/and GPL already. but not in the case of FM OPL/OPN cores, its commercial usage was explicit forbidden by its author (Jarek Burczyns...
by MetalliC
Tue Dec 01, 2015 6:51 pm
Forum: Hardware
Topic: Decapping more Genesis chips
Replies: 13
Views: 6326

Re: Decapping more Genesis chips

about SCSP DSP docs - there (almost) none of it. if I not mistaken, most of info comes from Dreamcast AICA docs, there is some brief explanation what its opcode bits means and how its workflow is. but it lacks of details. mentioned Macintosh software is almost useless, its like somewhat building kit...